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Physiological and Ultrastructural Alterations Linked to Intrinsic Mastication Inferiority of Segment Membranes in Satsuma Mandarin (Citrus unshiu Marc.) Fruits. PLANTS 2021; 11:plants11010039. [PMID: 35009047 PMCID: PMC8747345 DOI: 10.3390/plants11010039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/20/2021] [Accepted: 12/21/2021] [Indexed: 11/22/2022]
Abstract
Chewing texture is important for fresh citrus fruits, and the mastication trait of a segment directly determines chewing texture. Roughing disorder impairs the quality of Satsuma mandarin fruits, and it is typically correlated with intrinsic mastication inferiority (IMI). This study explored the role of segment membranes (SMs) in IMI. Similar to IMI in roughing-disordered fruits, segment shear force significantly enhanced relative to controls (CK); cell layers and cell wall thickness increased also in inferior masticating SMs. The ‘Miyamoto Wase’ cultivar exhibited larger segment shear force and more SM cell layers than ‘Juxiangzao’. In SMs, vessel cells could be divided into outside layers where segments adjoin and inside layers where juice sacs grow from. The inside vessel cell layers in the inferior masticating SMs were denser. Vessels with a length of 200 to 300 μm and a diameter of 5 to 15 μm predominated in SMs. The average vessel diameter enlarged by 13% to 16.5% in inferior masticating SMs, depending on cultivars. Furthermore, there was a decrease in vessels with a diameter <5 μm and an increase in vessels >10 μm in the inferior masticating SMs. Between phenotypes, protopectin increased significantly throughout development of inferior masticating SMs, while water-soluble pectin increased during the later stages of development. In one inferior masticating SM sample, protopectin and water-soluble pectin levels were higher in the inner-ring area than those in the outer-ring area. Correspondingly, expression of CuPME21 which is involved in pectin hydrolysis was consistently upregulated in the inferior masticating SMs throughout fruit development. The findings in this work provide novel insights into citrus SM structure and its IMI.
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Qian M, Xu Z, Zhang Z, Li Q, Yan X, Liu H, Han M, Li F, Zheng J, Zhang D, Zhao C. The downregulation of PpPG21 and PpPG22 influences peach fruit texture and softening. PLANTA 2021; 254:22. [PMID: 34218358 DOI: 10.1007/s00425-021-03673-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Accepted: 06/27/2021] [Indexed: 06/13/2023]
Abstract
The downregulation of PpPG21 and PpPG22 expression in melting-flesh peach delays fruit softening and hinders texture changes by influencing pectin solubilization and depolymerization. The polygalacturonase (PG)-catalyzed solubilization and depolymerization of pectin plays a central role in the softening and texture formation processes in peach fruit. In this study, the expression characteristics of 15 PpPG members in peach fruits belonging to the melting flesh (MF) and non-melting flesh (NMF) types were analyzed, and virus-induced gene silencing (VIGS) technology was used to identify the roles of PpPG21 (ppa006839m) and PpPG22 (ppa006857m) in peach fruit softening and texture changes. In both MF and NMF peaches, the expression of PpPG1, 10, 12, 23, and 25 was upregulated, whereas that of PpPG14, 24, 35, 38, and 39 was relatively stable or downregulated during shelf life. PpPG1 was highly expressed in NMF fruit, whereas PpPG21 and 22 were highly expressed in MF peaches. Suppressing the expression of PpPG21 and 22 by VIGS in MF peaches significantly reduced PG enzyme activity, maintained the firmness of the fruit during the late shelf life stage, and suppressed the occurrence of the "melting" stage compared with the control fruits. Moreover, the downregulation of PpPG21 and 22 expression also reduced the water-soluble pectin (WSP) content, increased the contents of ionic-soluble pectin (ISP) and covalent-soluble pectin (CSP) and affected the expression levels of ethylene synthesis- and pectin depolymerization-related genes in the late shelf life stage. These results indicate that PpPG21 and 22 play a major role in the development of the melting texture trait of peaches by depolymerizing cell wall pectin. Our results provide direct evidence showing that PG regulates peach fruit softening and texture changes.
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Affiliation(s)
- Ming Qian
- College of Horticulture, Northwest A&F University, Yangling, China
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Centre of Pear Engineering Technology Research, Nanjing Agricultural University, Nanjing, China
| | - Ze Xu
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Zehua Zhang
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Qin Li
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Xiangyan Yan
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Hangkong Liu
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Mingyu Han
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Furui Li
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Jicheng Zheng
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Dong Zhang
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Caiping Zhao
- College of Horticulture, Northwest A&F University, Yangling, China.
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Nakano R, Kawai T, Fukamatsu Y, Akita K, Watanabe S, Asano T, Takata D, Sato M, Fukuda F, Ushijima K. Postharvest Properties of Ultra-Late Maturing Peach Cultivars and Their Attributions to Melting Flesh ( M) Locus: Re-evaluation of M Locus in Association With Flesh Texture. FRONTIERS IN PLANT SCIENCE 2020; 11:554158. [PMID: 33324428 PMCID: PMC7725752 DOI: 10.3389/fpls.2020.554158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 10/28/2020] [Indexed: 06/12/2023]
Abstract
The postharvest properties of two ultra-late maturing peach cultivars, "Tobihaku" (TH) and "Daijumitsuto" (DJ), were investigated. Fruit were harvested at commercial maturity and held at 25°C. TH exhibited the characteristics of normal melting flesh (MF) peach, including rapid fruit softening associated with appropriate level of endogenous ethylene production In contrast, DJ did not soften at all during 3 weeks experimental period even though considerable ethylene production was observed. Fruit of TH and DJ were treated with 5,000 ppm of propylene, an ethylene analog, continuously for 7 days. TH softened rapidly whereas DJ maintained high flesh firmness in spite of an increase in endogenous ethylene production, suggesting that DJ but not TH lacked the ability to be softened in response to endogenous and exogenous ethylene/propylene. DNA-seq analysis showed that tandem endo-polygalacturonase (endoPG) genes located at melting flesh (M) locus, Pp-endoPGM (PGM), and Pp-endoPGF (PGF), were deleted in DJ. The endoPG genes at M locus are known to control flesh texture of peach fruit, and it was suggested that the non-softening property of DJ is due to the lack of endoPG genes. On the other hand, TH possessed an unidentified M haplotype that is involved in determination of MF phenotype. Structural identification of the unknown M haplotype, designated as M 0, through comparison with previously reported M haplotypes revealed distinct differences between PGM on M 0 haplotype (PGM-M0 ) and PGM on other haplotypes (PGM-M1 ). Peach M haplotypes were classified into four main haplotypes: M 0 with PGM-M0 ; M 1 with both PGM-M1 and PGF; M 2 with PGM-M1 ; and M 3 lacking both PGM and PGF. Re-evaluation of M locus in association with MF/non-melting flesh (NMF) phenotypes in more than 400 accessions by using whole genome shotgun sequencing data on database and/or by PCR genotyping demonstrated that M 0 haplotype was the common haplotype in MF accessions, and M 0 and M 1 haplotypes were dominant over M 2 and M 3 haplotypes and co-dominantly determined the MF trait. It was also assumed on the basis of structural comparison of M haplotypes among Prunus species that the ancestral haplotype of M 0 diverged from those of the other haplotypes before the speciation of Prunus persica.
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Affiliation(s)
- Ryohei Nakano
- Experimental Farm of Graduate School of Agriculture, Kyoto University, Kizugawa, Kyoto, Japan
| | - Takashi Kawai
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
| | - Yosuke Fukamatsu
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
| | - Kagari Akita
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
| | - Sakine Watanabe
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
| | - Takahiro Asano
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
| | - Daisuke Takata
- Faculty of Food and Agricultural Sciences, Fukushima University, Fukushima, Japan
| | - Mamoru Sato
- Faculty of Food and Agricultural Sciences, Fukushima University, Fukushima, Japan
| | - Fumio Fukuda
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
| | - Koichiro Ushijima
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
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Forlani S, Masiero S, Mizzotti C. Fruit ripening: the role of hormones, cell wall modifications, and their relationship with pathogens. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:2993-3006. [PMID: 30854549 DOI: 10.1093/jxb/erz112] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 02/20/2019] [Accepted: 02/27/2019] [Indexed: 05/20/2023]
Abstract
Fruits result from complex biological processes that begin soon after fertilization. Among these processes are cell division and expansion, accumulation of secondary metabolites, and an increase in carbohydrate biosynthesis. Later fruit ripening is accomplished by chlorophyll degradation and cell wall lysis. Fruit maturation is an essential step to optimize seed dispersal, and is controlled by a complex network of transcription factors and genetic regulators that are strongly influenced by phytohormones. Abscisic acid (ABA) and ethylene are the major regulators of ripening and senescence in both dry and fleshy fruits, as demonstrated by numerous ripening-defective mutants, effects of exogenous hormone application, and transcriptome analyses. While ethylene is the best characterized player in the final step of a fruit's life, ABA also has a key regulatory role, promoting ethylene production and acting as a stress-related hormone in response to drought and pathogen attack. In this review, we focus on the role of ABA and ethylene in relation to the interconnected biotic and abiotic phenomena that affect ripening and senescence. We integrate and discuss the most recent data available regarding these biological processes, which are crucial for post-harvest fruit conservation and for food safety.
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Affiliation(s)
- Sara Forlani
- Department of Biosciences, Università degli Studi di Milano, Milan, Italy
| | - Simona Masiero
- Department of Biosciences, Università degli Studi di Milano, Milan, Italy
| | - Chiara Mizzotti
- Department of Biosciences, Università degli Studi di Milano, Milan, Italy
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Carrasco-Valenzuela T, Muñoz-Espinoza C, Riveros A, Pedreschi R, Arús P, Campos-Vargas R, Meneses C. Expression QTL (eQTLs) Analyses Reveal Candidate Genes Associated With Fruit Flesh Softening Rate in Peach [ Prunus persica (L.) Batsch]. FRONTIERS IN PLANT SCIENCE 2019; 10:1581. [PMID: 31850046 PMCID: PMC6901599 DOI: 10.3389/fpls.2019.01581] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 11/12/2019] [Indexed: 05/22/2023]
Abstract
Significant differences in softening rate have been reported between melting flesh in peach and nectarine varieties. This trait seems to be controlled by several genes. We aimed to identify candidate genes involved in fruit softening rate by integrating quantitative trait loci (QTL) and expression QTL (eQTL) analyses, comparing siblings with contrasting softening rates. We used a segregating population derived from nectarine cv. 'Venus' selfing, which was phenotyped for softening rate during three seasons. Six siblings with high (HSR) and six with low softening rate (LSR) were sequenced using RNA-Seq. A group of 5,041 differentially expressed genes was identified. Also, we found a QTL with a LOD (logarithm of odds) score of 9.7 on LG4 in all analyzed seasons. Furthermore, we detected 1,062 eQTLs, of which 133 were found co-localizing with the identified QTL. Gene Ontology (GO) analysis showed 'Response to auxin' as one the main over-represented categories. Our findings suggest over-expression of auxin biosynthetic related genes in the HSR group, which implies a higher expression and/or accumulation of auxin, thereby triggering fast softening. Conversely, the LSR phenotype might be explained by an altered auxin-homeostasis associated with low auxin levels. This work will contribute to unraveling the genetic mechanisms responsible for the softening rate in peaches and nectarines and lead to the development of molecular markers.
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Affiliation(s)
- Tomás Carrasco-Valenzuela
- Centro de Biotecnología Vegetal, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Claudia Muñoz-Espinoza
- Centro de Biotecnología Vegetal, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Aníbal Riveros
- Centro de Biotecnología Vegetal, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Romina Pedreschi
- Escuela de Agronomía, Pontificia Universidad Católica de Valparaíso, Quillota, Chile
| | - Pere Arús
- IRTA, Centre de Recerca en Agrigenòmica (CSIC-IRTA-UAB-UB), Barcelona, Spain
| | - Reinaldo Campos-Vargas
- Centro de Biotecnología Vegetal, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Claudio Meneses
- Centro de Biotecnología Vegetal, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
- FONDAP Center for Genome Regulation, Santiago, Chile
- *Correspondence: Claudio Meneses,
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Wei X, Zhang Q, Liu W, Liu N, Zhang Y, Xu M, Ma X, Liu S, Zhang Y. Allelic variations of endopolygalacturonase genes associated with fruit softening in apricot ( Prunus armeniaca). ACTA HORTICULTURAE 2018:221-226. [PMID: 0 DOI: 10.17660/actahortic.2018.1214.39] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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Liu H, Qian M, Song C, Li J, Zhao C, Li G, Wang A, Han M. Down-Regulation of PpBGAL10 and PpBGAL16 Delays Fruit Softening in Peach by Reducing Polygalacturonase and Pectin Methylesterase Activity. FRONTIERS IN PLANT SCIENCE 2018; 9:1015. [PMID: 30050556 PMCID: PMC6050397 DOI: 10.3389/fpls.2018.01015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 06/21/2018] [Indexed: 06/07/2023]
Abstract
β-galactosidases are cell wall hydrolases that play an important role in fruit softening. However, PpBGALs mechanism impacting on ethylene-dependent peach fruit softening was still unclear. In this study, we found that PpBGAL4, -6, -8, -10, -16, and -17 may be required for ethylene-dependent peach softening and PpBGAL10, -16 may make a main contribution to it among 17 PpBGALs. Utilization of virus-induced gene silencing (VIGS) showed that fruits were firmer than those of the control at 4 and 6 days after harvest (DAH) when PpBGAL10 and PpBGAL16 expression was down-regulated. Suppression of PpBGAL10 and PpBGAL16 expression also reduced PpPG21 and PpPME3 transcription, and polygalacturonase (PG) and pectinmethylesterases (PME) activity. Overall, total cell wall material and protopectin slowly declined, water-soluble pectin slowly increased, and cellulose and hemicellulose was altered significantly at 4 DAH, relative to control fruit. In addition, PpACO1 expression and ethylene production were also suppressed at 4 DAH because of inhibiting PpBGAL10 and PpBGAL16 expression. These results suggested that down-regulation of PpBGAL10 and PpBGAL16 expression delays peach fruit softening by decreasing PG and PME activity, which inhibits cell wall degradation and ethylene production.
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Affiliation(s)
- Hangkong Liu
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Ming Qian
- Centre of Pear Engineering Technology Research, State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, China
| | - Chunhui Song
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Jinjin Li
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Caiping Zhao
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Guofang Li
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Anzhu Wang
- College of Horticulture, Northwest A&F University, Yangling, China
| | - Mingyu Han
- College of Horticulture, Northwest A&F University, Yangling, China
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Qian M, Zhang Y, Yan X, Han M, Li J, Li F, Li F, Zhang D, Zhao C. Identification and Expression Analysis of Polygalacturonase Family Members during Peach Fruit Softening. Int J Mol Sci 2016; 17:E1933. [PMID: 27869753 PMCID: PMC5133928 DOI: 10.3390/ijms17111933] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 11/02/2016] [Accepted: 11/07/2016] [Indexed: 01/01/2023] Open
Abstract
Polygalacturonase (PG) is an important hydrolytic enzyme involved in pectin degradation during fruit softening. However, the roles of PG family members in fruit softening remain unclear. We identified 45 PpPG genes in the peach genome which are clustered into six subclasses. PpPGs consist of four to nine exons and three to eight introns, and the exon/intron structure is basically conserved in all but subclass E. Only 16 PpPG genes were expressed in ripening fruit, and their expression profiles were analyzed during storage in two peach cultivars with different softening characteristics. Eight PGs (PpPG1, -10, -12, -13, -15, -23, -21, and -22) in fast-softening "Qian Jian Bai" (QJB) fruit and three PGs (PpPG15, -21, and -22) in slow-softening "Qin Wang" (QW) fruit exhibited softening-associated patterns; which also were affected by ethylene treatment. Our results suggest that the different softening characters in QW and QJB fruit is related to the amount of PG members. While keeping relatively lower levels during QW fruit softening, the expression of six PGs (PpPG1, -10, -12, -11, -14, and -35) rapidly induced by ethylene. PpPG24, -25 and -38 may not be involved in softening of peach fruit.
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Affiliation(s)
- Ming Qian
- College of Horticulture, Northwest A&F University, Yangling 712100, China.
| | - Yike Zhang
- College of Horticulture, Northwest A&F University, Yangling 712100, China.
| | - Xiangyan Yan
- College of Horticulture, Northwest A&F University, Yangling 712100, China.
| | - Mingyu Han
- College of Horticulture, Northwest A&F University, Yangling 712100, China.
| | - Jinjin Li
- College of Horticulture, Northwest A&F University, Yangling 712100, China.
| | - Fang Li
- College of Horticulture, Northwest A&F University, Yangling 712100, China.
| | - Furui Li
- College of Horticulture, Northwest A&F University, Yangling 712100, China.
| | - Dong Zhang
- College of Horticulture, Northwest A&F University, Yangling 712100, China.
| | - Caiping Zhao
- College of Horticulture, Northwest A&F University, Yangling 712100, China.
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Pons C, Martí C, Forment J, Crisosto CH, Dandekar AM, Granell A. A genetic genomics-expression approach reveals components of the molecular mechanisms beyond the cell wall that underlie peach fruit woolliness due to cold storage. PLANT MOLECULAR BIOLOGY 2016; 92:483-503. [PMID: 27714490 DOI: 10.1007/s11103-016-0526-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 08/06/2016] [Indexed: 05/14/2023]
Abstract
Peach fruits subjected to prolonged cold storage (CS) to delay decay and over-ripening often develop a form of chilling injury (CI) called mealiness/woolliness (WLT), a flesh textural disorder characterized by lack of juiciness. Transcript profiles were analyzed after different lengths of CS and subsequent shelf life ripening (SLR) in pools of fruits from siblings of the Pop-DG population with contrasting sensitivity to develop WLT. This was followed by quantitative PCR on pools and individual lines of the Pop-DG population to validate and extend the microarray results. Relative tolerance to WLT development during SLR was related to the fruit's ability to recover from cold and the reactivation of normal ripening, processes that are probably regulated by transcription factors involved in stress protection, stress recovery and induction of ripening. Furthermore, our results showed that altered ripening in WLT fruits during shelf life is probably due, in part, to cold-induced desynchronization of the ripening program involving ethylene and auxin hormonal regulation of metabolism and cell wall. In addition, we found strong correlation between expression of RNA translation and protein assembly genes and the visual injury symptoms.
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Affiliation(s)
- Clara Pons
- Instituto de Biología Molecular y Celular de Plantas. Consejo Superior de Investigaciones Científicas (CSIC) -Universidad Politécnica de Valencia (UPV), 46022, Valencia, Spain.
| | - Cristina Martí
- Instituto de Biología Molecular y Celular de Plantas. Consejo Superior de Investigaciones Científicas (CSIC) -Universidad Politécnica de Valencia (UPV), 46022, Valencia, Spain
| | - Javier Forment
- Instituto de Biología Molecular y Celular de Plantas. Consejo Superior de Investigaciones Científicas (CSIC) -Universidad Politécnica de Valencia (UPV), 46022, Valencia, Spain
| | - Carlos H Crisosto
- Department of Plant Sciences, University of California, Davis, CA, 95616, USA
| | - Abhaya M Dandekar
- Department of Plant Sciences, University of California, Davis, CA, 95616, USA
| | - Antonio Granell
- Instituto de Biología Molecular y Celular de Plantas. Consejo Superior de Investigaciones Científicas (CSIC) -Universidad Politécnica de Valencia (UPV), 46022, Valencia, Spain
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Onelli E, Ghiani A, Gentili R, Serra S, Musacchi S, Citterio S. Specific Changes of Exocarp and Mesocarp Occurring during Softening Differently Affect Firmness in Melting (MF) and Non Melting Flesh (NMF) Fruits. PLoS One 2015; 10:e0145341. [PMID: 26709823 PMCID: PMC4692397 DOI: 10.1371/journal.pone.0145341] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 12/02/2015] [Indexed: 12/24/2022] Open
Abstract
Melting (MF) and non melting flesh (NMF) peaches differ in their final texture and firmness. Their specific characteristics are achieved by softening process and directly dictate fruit shelf life and quality. Softening is influenced by various mechanisms including cell wall reorganization and water loss. In this work, the biomechanical properties of MF Spring Crest's and NMF Oro A's exocarp and mesocarp along with the amount and localization of hydroxycinnamic acids and flavonoids were investigated during fruit ripening and post-harvest. The objective was to better understand the role played by water loss and cell wall reorganization in peach softening. Results showed that in ripe Spring Crest, where both cell turgor loss and cell wall dismantling occurred, mesocarp had a little role in the fruit reaction to compression and probe penetration response was almost exclusively ascribed to the epidermis which functioned as a mechanical support to the pulp. In ripe Oro A's fruit, where cell wall disassembly did not occur and the loss of cell turgor was observed only in mesocarp, the contribution of exocarp to fruit firmness was consistent but relatively lower than that of mesocarp, suggesting that in addition to cell turgor, the integrity of cell wall played a key role in maintaining NMF fruit firmness. The analysis of phenols suggested that permeability and firmness of epidermis were associated with the presence of flavonoids and hydroxycinnamic acids.
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Affiliation(s)
- E. Onelli
- Department of Biosciences, University of Milan, Via Celoria 26, 20133, Milano, Italy
| | - A. Ghiani
- Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza n. 1, 20126, Milan, Italy
| | - R. Gentili
- Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza n. 1, 20126, Milan, Italy
| | - S. Serra
- Department of Horticulture, Washington State University, TFREC, Wenatchee, 98801, WA, United States of America
| | - S. Musacchi
- Department of Horticulture, Washington State University, TFREC, Wenatchee, 98801, WA, United States of America
| | - S. Citterio
- Department of Earth and Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza n. 1, 20126, Milan, Italy
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11
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Tatsuki M, Nakajima N, Fujii H, Shimada T, Nakano M, Hayashi KI, Hayama H, Yoshioka H, Nakamura Y. Increased levels of IAA are required for system 2 ethylene synthesis causing fruit softening in peach (Prunus persica L. Batsch). JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:1049-59. [PMID: 23364941 PMCID: PMC3580816 DOI: 10.1093/jxb/ers381] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The fruit of melting-flesh peach (Prunus persica L. Batsch) cultivars produce high levels of ethylene caused by high expression of PpACS1 (an isogene of 1-aminocyclopropane-1-carboxylic acid synthase), resulting in rapid fruit softening at the late-ripening stage. In contrast, the fruit of stony hard peach cultivars do not soften and produce little ethylene due to low expression of PpACS1. To elucidate the mechanism for suppressing PpACS1 expression in stony hard peaches, a microarray analysis was performed. Several genes that displayed similar expression patterns as PpACS1 were identified and shown to be indole-3-acetic acid (IAA)-inducible genes (Aux/IAA, SAUR). That is, expression of IAA-inducible genes increased at the late-ripening stage in melting flesh peaches; however, these transcripts were low in mature fruit of stony hard peaches. The IAA concentration increased suddenly just before harvest time in melting flesh peaches exactly coinciding with system 2 ethylene production. In contrast, the IAA concentration did not increase in stony hard peaches. Application of 1-naphthalene acetic acid, a synthetic auxin, to stony hard peaches induced a high level of PpACS1 expression, a large amount of ethylene production and softening. Application of an anti-auxin, α-(phenylethyl-2-one)-IAA, to melting flesh peaches reduced levels of PpACS1 expression and ethylene production. These observations indicate that suppression of PpACS1 expression at the late-ripening stage of stony hard peach may result from a low level of IAA and that a high concentration of IAA is required to generate a large amount of system 2 ethylene in peaches.
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Affiliation(s)
- Miho Tatsuki
- Institute of Fruit Tree Science, National Agriculture and Food Research Organization, Fujimoto, 2-1 Tsukuba, Ibaraki, Japan.
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12
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Kim SH, Nam EY, Cho KH, Shin IS, Kim HR, Hwang HS. Comparison of transcriptome analysis between red flash peach cultivar and white flash peach cultivar using next generation sequencing. ACTA ACUST UNITED AC 2012. [DOI: 10.5010/jpb.2012.39.4.273] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Roongsattham P, Morcillo F, Jantasuriyarat C, Pizot M, Moussu S, Jayaweera D, Collin M, Gonzalez-Carranza ZH, Amblard P, Tregear JW, Tragoonrung S, Verdeil JL, Tranbarger TJ. Temporal and spatial expression of polygalacturonase gene family members reveals divergent regulation during fleshy fruit ripening and abscission in the monocot species oil palm. BMC PLANT BIOLOGY 2012; 12:150. [PMID: 22920238 PMCID: PMC3546427 DOI: 10.1186/1471-2229-12-150] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Accepted: 07/26/2012] [Indexed: 05/18/2023]
Abstract
BACKGROUND Cell separation that occurs during fleshy fruit abscission and dry fruit dehiscence facilitates seed dispersal, the final stage of plant reproductive development. While our understanding of the evolutionary context of cell separation is limited mainly to the eudicot model systems tomato and Arabidopsis, less is known about the mechanisms underlying fruit abscission in crop species, monocots in particular. The polygalacturonase (PG) multigene family encodes enzymes involved in the depolymerisation of pectin homogalacturonan within the primary cell wall and middle lamella. PG activity is commonly found in the separation layers during organ abscission and dehiscence, however, little is known about how this gene family has diverged since the separation of monocot and eudicots and the consequence of this divergence on the abscission process. RESULTS The objective of the current study was to identify PGs responsible for the high activity previously observed in the abscission zone (AZ) during fruit shedding of the tropical monocot oil palm, and to analyze PG gene expression during oil palm fruit ripening and abscission. We identified 14 transcripts that encode PGs, all of which are expressed in the base of the oil palm fruit. The accumulation of five PG transcripts increase, four decrease and five do not change during ethylene treatments that induce cell separation. One PG transcript (EgPG4) is the most highly induced in the fruit base, with a 700-5000 fold increase during the ethylene treatment. In situ hybridization experiments indicate that the EgPG4 transcript increases preferentially in the AZ cell layers in the base of the fruit in response to ethylene prior to cell separation. CONCLUSIONS The expression pattern of EgPG4 is consistent with the temporal and spatial requirements for cell separation to occur during oil palm fruit shedding. The sequence diversity of PGs and the complexity of their expression in the oil palm fruit tissues contrast with data from tomato, suggesting functional divergence underlying the ripening and abscission processes has occurred between these two fruit species. Furthermore, phylogenetic analysis of EgPG4 with PGs from other species suggests some conservation, but also diversification has occurred between monocots and eudicots, in particular between dry and fleshy fruit species.
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Affiliation(s)
- Peerapat Roongsattham
- Institut de Recherche pour le Développement, IRD Centre de Montpellier, IRD/CIRAD Palm Development Group, DIADE 911 avenue agropolis BP 64501, 34394, Montpellier cedex 5, France
| | - Fabienne Morcillo
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, CIRAD, UMR DIADE, Montpellier, F-34398, France
| | - Chatchawan Jantasuriyarat
- Department of Genetics, Faculty of Science, Kasetsart University, Bangkhen Campus, 50 Phahonyothin Road, Jatujak, Thailand
| | - Maxime Pizot
- Institut de Recherche pour le Développement, IRD Centre de Montpellier, IRD/CIRAD Palm Development Group, DIADE 911 avenue agropolis BP 64501, 34394, Montpellier cedex 5, France
| | - Steven Moussu
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, CIRAD, UMR DIADE, Montpellier, F-34398, France
| | - Dasuni Jayaweera
- Division, Loughborough, The University of Nottingham, Sutton Bonington Campus, School of Biosciences, Plant Science, Leicestershire, LE12 5RD, United Kingdom
| | - Myriam Collin
- Institut de Recherche pour le Développement, IRD Centre de Montpellier, IRD/CIRAD Palm Development Group, DIADE 911 avenue agropolis BP 64501, 34394, Montpellier cedex 5, France
| | - Zinnia H Gonzalez-Carranza
- Division, Loughborough, The University of Nottingham, Sutton Bonington Campus, School of Biosciences, Plant Science, Leicestershire, LE12 5RD, United Kingdom
| | | | - James W Tregear
- Institut de Recherche pour le Développement, IRD Centre de Montpellier, IRD/CIRAD Palm Development Group, DIADE 911 avenue agropolis BP 64501, 34394, Montpellier cedex 5, France
| | - Somvong Tragoonrung
- Genome Institute, National Center for Genetic Engineering and Biotechnology, BIOTEC, 113 Thailand Science Park, Phahonyothin Road, Klong 1, Klong Luang, Pathumthani, 12120, Thailand
| | - Jean-Luc Verdeil
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement CIRAD, UMR AGAP, MRI-PHIV, Montpellier, F-34398, France
| | - Timothy J Tranbarger
- Institut de Recherche pour le Développement, IRD Centre de Montpellier, IRD/CIRAD Palm Development Group, DIADE 911 avenue agropolis BP 64501, 34394, Montpellier cedex 5, France
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Atkinson RG, Sutherland PW, Johnston SL, Gunaseelan K, Hallett IC, Mitra D, Brummell DA, Schröder R, Johnston JW, Schaffer RJ. Down-regulation of POLYGALACTURONASE1 alters firmness, tensile strength and water loss in apple (Malus x domestica) fruit. BMC PLANT BIOLOGY 2012; 12:129. [PMID: 22856470 PMCID: PMC3509026 DOI: 10.1186/1471-2229-12-129] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 07/25/2012] [Indexed: 05/18/2023]
Abstract
BACKGROUND While there is now a significant body of research correlating apple (Malus x domestica) fruit softening with the cell wall hydrolase ENDO-POLYGALACTURONASE1 (PG1), there is currently little knowledge of its physiological effects in planta. This study examined the effect of down regulation of PG1 expression in 'Royal Gala' apples, a cultivar that typically has high levels of PG1, and softens during fruit ripening. RESULTS PG1-suppressed 'Royal Gala' apples harvested from multiple seasons were firmer than controls after ripening, and intercellular adhesion was higher. Cell wall analyses indicated changes in yield and composition of pectin, and a higher molecular weight distribution of CDTA-soluble pectin. Structural analyses revealed more ruptured cells and free juice in pulled apart sections, suggesting improved integrity of intercellular connections and consequent cell rupture due to failure of the primary cell walls under stress. PG1-suppressed lines also had reduced expansion of cells in the hypodermis of ripe apples, resulting in more densely packed cells in this layer. This change in morphology appears to be linked with reduced transpirational water loss in the fruit. CONCLUSIONS These findings confirm PG1's role in apple fruit softening and suggests that this is achieved in part by reducing cellular adhesion. This is consistent with previous studies carried out in strawberry but not with those performed in tomato. In apple PG1 also appears to influence other fruit texture characters such as juiciness and water loss.
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Affiliation(s)
- Ross G Atkinson
- The New Zealand Institute for Plant & Food Research Limited (PFR), Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand
| | - Paul W Sutherland
- The New Zealand Institute for Plant & Food Research Limited (PFR), Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand
| | - Sarah L Johnston
- The New Zealand Institute for Plant & Food Research Limited (PFR), Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand
| | - Kularajathevan Gunaseelan
- The New Zealand Institute for Plant & Food Research Limited (PFR), Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand
| | - Ian C Hallett
- The New Zealand Institute for Plant & Food Research Limited (PFR), Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand
| | - Deepali Mitra
- The New Zealand Institute for Plant & Food Research Limited (PFR), Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand
| | - David A Brummell
- PFR, Food Industry Science Centre, Private Bag 11600, Palmerston North, 4442, New Zealand
| | - Roswitha Schröder
- The New Zealand Institute for Plant & Food Research Limited (PFR), Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand
| | - Jason W Johnston
- The New Zealand Institute for Plant & Food Research Limited (PFR), Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand
| | - Robert J Schaffer
- The New Zealand Institute for Plant & Food Research Limited (PFR), Mount Albert Research Centre, Private Bag 92169, Auckland 1142, New Zealand
- The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Lei Y, Liu YZ, Gu QQ, Yang XY, Deng XX, Chen JY. Comparison of cell wall metabolism in the pulp of three cultivars of 'Nanfeng' tangerine differing in mastication trait. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2012; 92:496-502. [PMID: 21732384 DOI: 10.1002/jsfa.4554] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 05/19/2011] [Accepted: 06/10/2011] [Indexed: 05/31/2023]
Abstract
BACKGROUND Like sweet orange (Citrus sinensis), tangerine (Citrus reticulata) is another citrus crop grown widely throughout the world. However, whether it shares a common mechanism with sweet orange in forming a given mastication trait is still unclear. In this study, three 'Nanfeng' tangerine cultivars, 'Yangxiao-26' ('YX-26') with inferior mastication trait, elite 'YX-26' with moderate mastication trait and 'Miguang' ('MG') with superior mastication trait, were selected to investigate the formation mechanism of mastication trait. RESULTS 'MG' had the lowest contents of total pectin, protopectin and lignin and the highest gene expression levels of citrus polygalacturonase (PG) and pectin methylesterase (PME) at the end of fruit ripening, whereas 'YX-26' had the lowest water-soluble pectin (WSP) content, the highest lignin content and the lowest PG and PME expression levels. The contents of cellulose and hemicellulose were similar among the three tangerines. CONCLUSION The fruit mastication trait of C. reticulata was determined by the proportions of WSP and protopectin as well as lignin content, not by cellulose and hemicellulose contents. Pectin content could be a major contribution to the feeling of mastication trait, while PG and PME exhibited an important role in forming a given mastication trait according to the present results as well as previous results for C. sinensis.
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Affiliation(s)
- Ying Lei
- Key Laboratory of Horticultural Plant Biology (Huazhong Agricultural University), Ministry of Education, Wuhan 430070, China; State Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
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16
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Ghiani A, Onelli E, Aina R, Cocucci M, Citterio S. A comparative study of melting and non-melting flesh peach cultivars reveals that during fruit ripening endo-polygalacturonase (endo-PG) is mainly involved in pericarp textural changes, not in firmness reduction. JOURNAL OF EXPERIMENTAL BOTANY 2011; 62:4043-54. [PMID: 21511903 DOI: 10.1093/jxb/err109] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Peach softening is usually attributed to the dismantling of the cell wall in which endo-polygalacturonase (endo-PG)-catalysed depolymerization of pectins plays a central role. In this study, the hypothesis that the function of endo-PG is critical for achieving a melting flesh fruit texture but not for reducing fruit firmness was tested by comparing pericarp morphology and endo-PG expression and localization in melting (MF) and non-melting flesh (NMF) fruit at successive stages of ripening. MF Bolero, Springbelle, and Springcrest, and NMF Oro-A and Jonia cultivars were analysed. Both MF and NMF fruit were left to ripen on the tree and reached a firmness of <10 Newtons (N). The image analysis of pericarp tissues revealed that during softening the loss of cell turgidity was a process common to mesocarp cells of all MF and NMF fruit and was clearly visible in peaches with a firmness of less than ∼20 N. In contrast, the loss of cell adhesion was a feature exclusively observed in ripe MF fruit pericarp. In this ripe fruit, large numbers of endo-PG isoforms were highly expressed and the enzyme localization corresponded to the middle lamella. As a consequence, wide apoplastic spaces characterized the pericarp of ripe MF peaches. In contrast, no loss of cell adhesion was observed in any NMF fruit or in unripe MF peaches. Accordingly, no endo-PG was detected in unripe NMF fruit, whereas few and poorly expressed enzyme isoforms were revealed in ripe NMF and in unripe MF peaches. In this fruit, the poorly expressed endo-PG localized mainly in vesicles within the cytoplasm and inner primary cell wall. On the whole the results suggested that endo-PG function was needed to achieve melting flesh texture, which was characterized by wide apoplastic spaces and partially deflated mesocarp cells. Conversely, endo-PG activity had no critical influence on the reduction of fruit firmness given the capacity of NMF peaches to soften, reaching values of 5-10 N. As in tomato, the change of symplast/apoplast water status seems to be the main process through which peach fruit regulates its firmness.
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Affiliation(s)
- A Ghiani
- Department of Environmental Sciences, University of Milano-Bicocca, Piazza della Scienza n. 1, 20126 Milan, Italy
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17
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Zhu LQ, Zhou J, Zhu SH. Effect of a combination of nitric oxide treatment and intermittent warming on prevention of chilling injury of ‘Feicheng’ peach fruit during storage. Food Chem 2010. [DOI: 10.1016/j.foodchem.2009.12.025] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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18
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Lei Y, Liu YZ, Zeng WF, Deng XX. Physicochemical and molecular analysis of cell wall metabolism between two navel oranges (Citrus sinensis) with different mastication traits. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2010; 90:1479-84. [PMID: 20549800 DOI: 10.1002/jsfa.3970] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
BACKGROUND FJ72-1 navel orange and its bud mutant FJWC exhibit differences in melting texture character which are influenced mostly by cell wall metabolism. Here we compared the contents of water soluble pectin (WSP), protopectin, total pectin (TP), cellulose, and hemicellulose, activities of polygalaturonase (PG), pectin methylesterase (PME), pectate lyases (PL), cellulase (Cel) and gene expression levels of PG, PME, PL and Cel between the two cultivars. RESULTS The content of cellulose and hemicellulose decreased progressively during fruit ripening. At the harvest time (230 DAF), the content of cellulose and hemicellulose in FJWC were obviously higher than those in FJ72-1; the WSP content, PG activities and its gene expression level in FJWC was lower than those in FJ72-1. Moreover, gene expression levels of PME and Cel in FJWC were only one-quarter of those in FJ72-1 at 230 DAF. CONCLUSION The present work showed that the inferior melting character of FJWC attributed to the lower WSP, higher TP or protopectins, higher cellulose and hemicellulose than those in the pulp of FJ72-1 at harvest time. Lower expression levels of PG, PME and Cel at harvest time might be associated with the inferior melting character.
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Affiliation(s)
- Ying Lei
- State Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, P.R. China
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Costa F, Peace CP, Stella S, Serra S, Musacchi S, Bazzani M, Sansavini S, Van de Weg WE. QTL dynamics for fruit firmness and softening around an ethylene-dependent polygalacturonase gene in apple (Malus x domestica Borkh.). JOURNAL OF EXPERIMENTAL BOTANY 2010; 61:3029-39. [PMID: 20462945 PMCID: PMC2892147 DOI: 10.1093/jxb/erq130] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Revised: 03/30/2010] [Accepted: 04/21/2010] [Indexed: 05/19/2023]
Abstract
Apple fruit are well known for their storage life, although a wide range of flesh softening occurs among cultivars. Loss of firmness is genetically coordinated by the action of several cell wall enzymes, including polygalacturonase (PG) which depolymerizes cell wall pectin. By the analysis of 'Fuji' (Fj) and 'Mondial Gala' (MG), two apple cultivars characterized by a distinctive ripening behaviour, the involvement of Md-PG1 in the fruit softening process was confirmed to be ethylene dependent by its transcript being down-regulated by 1-methylcyclopropene treatment in MG and in the low ethylene-producing cultivar Fj. Comparing the PG sequence of MG and Fj, a single nucleotide polymorphism (SNP) was discovered. Segregation of the Md-PG1(SNP) marker within a full-sib population, obtained by crossing Fj and MG, positioned Md-PG1 in the linkage group 10 of MG, co-located with a quantitative trait locus (QTL) identified for fruit firmness in post-harvest ripening. Fruit firmness and softening analysed in different stages, from harvest to post-storage, determined a shift of the QTL from the top of this linkage group to the bottom, where Md-ACO1, a gene involved in ethylene biosynthesis in apple, is mapped. This PG-ethylene-related gene has beeen positioned in the apple genome on chromosome 10, which contains several QTLs controlling fruit firmness and softening, and the interplay among the allelotypes of the linked loci should be considered in the design of a marker-assisted selection breeding scheme for apple texture.
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Affiliation(s)
- Fabrizio Costa
- Department of Fruit Tree and Woody Plant Science, University of Bologna, Bologna, Italy.
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20
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Nilo R, Saffie C, Lilley K, Baeza-Yates R, Cambiazo V, Campos-Vargas R, González M, Meisel LA, Retamales J, Silva H, Orellana A. Proteomic analysis of peach fruit mesocarp softening and chilling injury using difference gel electrophoresis (DIGE). BMC Genomics 2010; 11:43. [PMID: 20082721 PMCID: PMC2822761 DOI: 10.1186/1471-2164-11-43] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2009] [Accepted: 01/18/2010] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Peach fruit undergoes a rapid softening process that involves a number of metabolic changes. Storing fruit at low temperatures has been widely used to extend its postharvest life. However, this leads to undesired changes, such as mealiness and browning, which affect the quality of the fruit. In this study, a 2-D DIGE approach was designed to screen for differentially accumulated proteins in peach fruit during normal softening as well as under conditions that led to fruit chilling injury. RESULTS The analysis allowed us to identify 43 spots -representing about 18% of the total number analyzed- that show statistically significant changes. Thirty-nine of the proteins could be identified by mass spectrometry. Some of the proteins that changed during postharvest had been related to peach fruit ripening and cold stress in the past. However, we identified other proteins that had not been linked to these processes. A graphical display of the relationship between the differentially accumulated proteins was obtained using pairwise average-linkage cluster analysis and principal component analysis. Proteins such as endopolygalacturonase, catalase, NADP-dependent isocitrate dehydrogenase, pectin methylesterase and dehydrins were found to be very important for distinguishing between healthy and chill injured fruit. A categorization of the differentially accumulated proteins was performed using Gene Ontology annotation. The results showed that the 'response to stress', 'cellular homeostasis', 'metabolism of carbohydrates' and 'amino acid metabolism' biological processes were affected the most during the postharvest. CONCLUSIONS Using a comparative proteomic approach with 2-D DIGE allowed us to identify proteins that showed stage-specific changes in their accumulation pattern. Several proteins that are related to response to stress, cellular homeostasis, cellular component organization and carbohydrate metabolism were detected as being differentially accumulated. Finally, a significant proportion of the proteins identified had not been associated with softening, cold storage or chilling injury-altered fruit before; thus, comparative proteomics has proven to be a valuable tool for understanding fruit softening and postharvest.
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Affiliation(s)
- Ricardo Nilo
- Centro de Biotecnología Vegetal, Universidad Andrés Bello, Santiago, Chile
- Millennium Nucleus in Plant Cell Biotechnology (MN-PCB), Santiago, Chile
| | - Carlos Saffie
- Centro de Biotecnología Vegetal, Universidad Andrés Bello, Santiago, Chile
- Millennium Nucleus in Plant Cell Biotechnology (MN-PCB), Santiago, Chile
| | - Kathryn Lilley
- Cambridge Centre for Proteomics, University of Cambridge, Cambridge, UK
| | | | - Verónica Cambiazo
- Laboratorio de Bioinformática y Expresión Génica, INTA-Universidad de Chile, Santiago, Chile
- Millennium Nucleus Center for Genomics of the Cell (CGC), Santiago, Chile
| | - Reinaldo Campos-Vargas
- Centro de Biotecnología Vegetal, Universidad Andrés Bello, Santiago, Chile
- Millennium Nucleus in Plant Cell Biotechnology (MN-PCB), Santiago, Chile
- Institute of Agricultural Research (INIA-La Platina), Santiago, Chile
| | - Mauricio González
- Laboratorio de Bioinformática y Expresión Génica, INTA-Universidad de Chile, Santiago, Chile
| | - Lee A Meisel
- Centro de Biotecnología Vegetal, Universidad Andrés Bello, Santiago, Chile
- Millennium Nucleus in Plant Cell Biotechnology (MN-PCB), Santiago, Chile
| | - Julio Retamales
- Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago, Chile
| | - Herman Silva
- Millennium Nucleus in Plant Cell Biotechnology (MN-PCB), Santiago, Chile
- Plant Functional Genomics & Bioinformatics Lab, Universidad Andrés Bello, Santiago, Chile
| | - Ariel Orellana
- Centro de Biotecnología Vegetal, Universidad Andrés Bello, Santiago, Chile
- Millennium Nucleus in Plant Cell Biotechnology (MN-PCB), Santiago, Chile
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21
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Vizoso P, Meisel LA, Tittarelli A, Latorre M, Saba J, Caroca R, Maldonado J, Cambiazo V, Campos-Vargas R, Gonzalez M, Orellana A, Silva H. Comparative EST transcript profiling of peach fruits under different post-harvest conditions reveals candidate genes associated with peach fruit quality. BMC Genomics 2009. [PMID: 19744325 DOI: 10.1186/1471‐2164‐10‐423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Cold storage is used to inhibit peach fruit ripening during shipment to distant markets. However, this cold storage can negatively affect the quality of the fruit when it is ripened, resulting in disorders such as wooliness, browning or leathering. In order to understand the individual and combined biological effects that factors such as cold storage and ripening have on the fruit and fruit quality, we have taken a comparative EST transcript profiling approach to identify genes that are differentially expressed in response to these factors. RESULTS We sequenced 50,625 Expressed Sequence Tags (ESTs) from peach mesocarp (Prunus persica O'Henry variety) stored at four different postharvest conditions. A total of 10,830 Unigenes (4,169 contigs and 6,661 singletons) were formed by assembling these ESTs. Additionally, a collection of 614 full-length and 1,109 putative full-length cDNA clones within flanking loxP recombination sites was created. Statistically analyzing the EST population, we have identified genes that are differentially expressed during ripening, in response to cold storage or the combined effects of cold storage and ripening. Pair-wise comparisons revealed 197 contigs with at least one significant difference in transcript abundance between at least two conditions. Gene expression profile analyses revealed that the contigs may be classified into 13 different clusters of gene expression patterns. These clusters include groups of contigs that increase or decrease transcript abundance during ripening, in response to cold or ripening plus cold. CONCLUSION These analyses have enabled us to statistically identify novel genes and gene clusters that are differentially expressed in response to post-harvest factors such as long-term cold storage, ripening or a combination of these two factors. These differentially expressed genes reveal the complex biological processes that are associated with these factors, as well as a large number of putative gene families that may participate differentially in these processes. In particular, these analyzes suggest that woolly fruits lack the increased boost of metabolic processes necessary for ripening. Additionally, these results suggest that the mitochondria and plastids play a major role in these processes. The EST sequences and full-length cDNA clones developed in this work, combined with the large population of differentially expressed genes may serve as useful tools and markers that will enable the scientific community to better define the molecular processes that affect fruit quality in response to post-harvest conditions and the organelles that participate in these processes.
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Affiliation(s)
- Paula Vizoso
- Centro de Biotecnología Vegetal, Universidad Andrés Bello, Santiago, Chile
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22
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Vizoso P, Meisel LA, Tittarelli A, Latorre M, Saba J, Caroca R, Maldonado J, Cambiazo V, Campos-Vargas R, Gonzalez M, Orellana A, Silva H. Comparative EST transcript profiling of peach fruits under different post-harvest conditions reveals candidate genes associated with peach fruit quality. BMC Genomics 2009; 10:423. [PMID: 19744325 PMCID: PMC2748099 DOI: 10.1186/1471-2164-10-423] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2008] [Accepted: 09/10/2009] [Indexed: 12/02/2022] Open
Abstract
Background Cold storage is used to inhibit peach fruit ripening during shipment to distant markets. However, this cold storage can negatively affect the quality of the fruit when it is ripened, resulting in disorders such as wooliness, browning or leathering. In order to understand the individual and combined biological effects that factors such as cold storage and ripening have on the fruit and fruit quality, we have taken a comparative EST transcript profiling approach to identify genes that are differentially expressed in response to these factors. Results We sequenced 50,625 Expressed Sequence Tags (ESTs) from peach mesocarp (Prunus persica O'Henry variety) stored at four different postharvest conditions. A total of 10,830 Unigenes (4,169 contigs and 6,661 singletons) were formed by assembling these ESTs. Additionally, a collection of 614 full-length and 1,109 putative full-length cDNA clones within flanking loxP recombination sites was created. Statistically analyzing the EST population, we have identified genes that are differentially expressed during ripening, in response to cold storage or the combined effects of cold storage and ripening. Pair-wise comparisons revealed 197 contigs with at least one significant difference in transcript abundance between at least two conditions. Gene expression profile analyses revealed that the contigs may be classified into 13 different clusters of gene expression patterns. These clusters include groups of contigs that increase or decrease transcript abundance during ripening, in response to cold or ripening plus cold. Conclusion These analyses have enabled us to statistically identify novel genes and gene clusters that are differentially expressed in response to post-harvest factors such as long-term cold storage, ripening or a combination of these two factors. These differentially expressed genes reveal the complex biological processes that are associated with these factors, as well as a large number of putative gene families that may participate differentially in these processes. In particular, these analyzes suggest that woolly fruits lack the increased boost of metabolic processes necessary for ripening. Additionally, these results suggest that the mitochondria and plastids play a major role in these processes. The EST sequences and full-length cDNA clones developed in this work, combined with the large population of differentially expressed genes may serve as useful tools and markers that will enable the scientific community to better define the molecular processes that affect fruit quality in response to post-harvest conditions and the organelles that participate in these processes.
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Affiliation(s)
- Paula Vizoso
- Centro de Biotecnología Vegetal, Universidad Andrés Bello, Santiago, Chile
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Bianco L, Lopez L, Scalone AG, Di Carli M, Desiderio A, Benvenuto E, Perrotta G. Strawberry proteome characterization and its regulation during fruit ripening and in different genotypes. J Proteomics 2009; 72:586-607. [DOI: 10.1016/j.jprot.2008.11.019] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2008] [Revised: 10/08/2008] [Accepted: 11/24/2008] [Indexed: 11/17/2022]
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24
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Manganaris G, Vasilakakis M, Mignani I, Manganaris A. Cell Wall Physicochemical Properties as Indicators of Peach Quality During Fruit Ripening after Cold Storage. FOOD SCI TECHNOL INT 2008. [DOI: 10.1177/1082013208097251] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A comparative study between melting flesh peach fruit (Prunus persica L. Batsch cvs. Royal Glory and Morettini No 2) with contrasting tissue firmness during their on-tree ripening was conducted. Such fruit were cold stored (0 °C) for 4 and 6 weeks, and subsequently transferred at 25 °C (shelf life) for up to 5 days and evaluated for quality attributes and cell wall physicochemical properties. Data were partly unexpected, since fruit of the soft cultivar (Morettini No 2) were characterized by lower exo- and endo-PG activity, lower amounts of ethylene evolution, as well as higher amounts of endogenous calcium bound in the cell wall compared to fruit of the firmer cultivar (Royal Glory). These differences may be attributed to the incidence of chilling injury symptoms, evident as loss of juiciness in Morettini No 2 fruit, while Royal Glory fruit were characterized by acceptable appearance and eating quality even after 6 weeks cold storage plus 5 days shelf life, as the fruit softened gradually without cell rupture. Overall results showed that no direct relationship between cell wall physicochemical properties and sensory attributes can be established, indicating the complexity of peach fruit ripening. Since fruit of both cultivars presented similar tissue firmness after 5 days shelf life an attempt to distinguish normal peach fruit softening from cell rupture-chilling injury also has been made in the current study.
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Affiliation(s)
- G.A. Manganaris
- Faculty of Agriculture, Aristotle University. 541 24, Thessaloniki, Greece,
| | - M. Vasilakakis
- Faculty of Agriculture, Aristotle University. 541 24, Thessaloniki, Greece
| | - I. Mignani
- Facoltà di Agraria, Università degli Studi di Milano. Via Celoria 2, 20133, Milano, Italy
| | - A. Manganaris
- Department of Crop Production, Technological Educational Institute. 57400, Sindos-Thessaloniki, Greece
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Bennett AB, Labavitch JM. Ethylene and ripening-regulated expression and function of fruit cell wall modifying proteins. PLANT SCIENCE 2008; 175:130-136. [PMID: 0 DOI: 10.1016/j.plantsci.2008.03.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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26
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Trainotti L, Pavanello A, Zanin D. PpEG4 is a peach endo-beta-1,4-glucanase gene whose expression in climacteric peaches does not follow a climacteric pattern. JOURNAL OF EXPERIMENTAL BOTANY 2006; 57:589-98. [PMID: 16410260 DOI: 10.1093/jxb/erj043] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In peach (Prunus persica L. Batsch.) the degradation of the pectic compounds of the cell wall is considered to be the principal component responsible for fruit softening. Many genes encoding enzymes acting on the different polymers of the pectic matrix have been shown to be highly expressed during the late phases of softening, with polygalacturonase being the most important. Nevertheless, it is known that softening starts well before the ethylene climacteric rise which occurs concomitant with the maximal expression of the pectolytic enzymes. The cloning and characterization of PpEG4, an endo-beta-1,4-glucanase (EGase) gene preferentially expressed in preclimacteric fruits, are presented here. PpEG4 belongs to the group of EGases containing, at their carboxy-terminus, a peptide similar to the cellulose binding domain of microbial origin. This EGase is also expressed during abscission of both leaves and fruits. The effect of exogenous ethylene treatments on PpEG4 transcription is null in young fruits and negative in preclimacteric ones, while it is positive in abscission zones. Thus, the expression of PpEG4 seems to be more dependent on the type of separation process rather than being influenced by a direct hormone action. The ability of the PpEG4 regulatory sequences to drive transcription in cells undergoing separation events is also maintained in tomato, where about 3 kb of the gene promoter could drive the expression of gusA in preclimacteric fruits and in the fruit abscission zones.
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Affiliation(s)
- Livio Trainotti
- Department of Biology, University of Padua, Via G. Colombo 3, I-35121 Padova, Italy
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27
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Tatsuki M, Haji T, Yamaguchi M. The involvement of 1-aminocyclopropane-1-carboxylic acid synthase isogene, Pp-ACS1, in peach fruit softening. JOURNAL OF EXPERIMENTAL BOTANY 2006; 57:1281-9. [PMID: 16531466 DOI: 10.1093/jxb/erj097] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Ethylene promotes fruit ripening, including softening. The fruit of melting-flesh peach (Prunus persica (L). Batsch) cultivar 'Akatsuki' produces increasing levels of ethylene, and the flesh firmness softens rapidly during the ripening stage. On the other hand, the fruit of stony hard peach cultivars 'Yumyeong', 'Odoroki', and 'Manami' does not soften and produces little ethylene during fruit ripening and storage. To clarify the mechanism of suppression of ethylene production in stony hard peaches, the expression patterns of four ethylene biosynthesis enzymes were examined: ACC synthases (Pp-ACS1, Pp-ACS2, and Pp-ACS3) and ACC oxidase (Pp-ACO1). In the melting-flesh cultivar 'Akatsuki', Pp-ACS1 mRNA was dramatically induced after harvesting, and a large amount of ethylene was produced. On the other hand, in stony hard peaches, Pp-ACS1 mRNA was not induced during the ripening stage, and ethylene production was inhibited. Since Pp-ACS1 mRNA was induced normally in senescing flowers, wounded leaves, and wounded immature fruit of 'Yumyeong', Pp-ACS1 was suppressed only at the ripening stage, and was not a defect in Pp-ACS1. These results indicate that the suppression of fruit softening in stony hard peach cultivars was caused by a low level of ethylene production, which depends on the suppressed expression of Pp-ACS1.
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Affiliation(s)
- Miho Tatsuki
- National Institute of Fruit Tree Science, NARO, Fujimoto, 2-1 Tsukuba, Ibaraki 305-8605, Japan.
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28
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Morgutti S, Negrini N, Nocito FF, Ghiani A, Bassi D, Cocucci M. Changes in endopolygalacturonase levels and characterization of a putative endo-PG gene during fruit softening in peach genotypes with nonmelting and melting flesh fruit phenotypes. THE NEW PHYTOLOGIST 2006; 171:315-28. [PMID: 16866939 DOI: 10.1111/j.1469-8137.2006.01763.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The changes in endopolygalacturonase (endo-PG) levels and endo-PG expression in nonmelting flesh (NMF) and melting flesh (MF) peach fruits (Prunus persica) during softening were studied. The endo-PG gene was analysed to identify polymorphisms exploitable for early marker-assisted selection (MAS) of flesh texture. The role of endo-PG in softening was assessed by western and northern blotting and by biochemical analyses. Polymorphisms in the endo-PG gene were revealed by reverse transcription-polymerase chain reaction (RT-PCR) and sequencing. An endo-PG protein was detected in both NMF and MF fruits. The levels of this endo-PG protein were higher and increased with softening in MF fruits, but remained lower and were constant in NMF fruits. The different levels of endo-PG appeared to be caused by the differential expression of an endo-PG gene, whose open-reading frame (ORF) showed five single nucleotide polymorphisms (SNPs) in NMF 'Oro A' compared with MF 'Bolero'. One of these SNPs allowed us to determine the allelic configuration at the melting flesh (M) locus and also seemed to be exploitable for early MAS in other NMF/MF phenotypes. The NMF phenotype does not seem to be caused by a large deletion of the endo-PG gene.
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Affiliation(s)
- S Morgutti
- Dipartimento di Produzione Vegetale, University of Milan, via Celoria 2, 20133 Milan, Italy.
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29
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Redondo-Nevado J, Moyano E, Medina-Escobar N, Caballero JL, Muñoz-Blanco J. A fruit-specific and developmentally regulated endopolygalacturonase gene from strawberry (Fragaria x ananassa cv. Chandler). JOURNAL OF EXPERIMENTAL BOTANY 2001; 52:1941-1945. [PMID: 11520883 DOI: 10.1093/jexbot/52.362.1941] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A fruit-specific and developmentally regulated polygalacturonase gene (spG gene) from strawberry (Fragaria x ananassa cv. Chandler) has been cloned and characterized at a molecular and physiological level. Comparison analysis of the corresponding deduced sPG protein have shown that this strawberry gene is similar to Clade A endopolygalacturonase genes. Moreover, the spatio-temporal and hormonal gene expression pattern suggests a close relationship between the expression of this gene and the onset of the strawberry fruit ripening process and agrees with that of the production of oligosaccharins which have already been described as active molecules involved in fruit ripening. The results are discussed in terms of a putative role of this enzyme in the release of oligosaccharins from the strawberry fruit cell wall.
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Affiliation(s)
- J Redondo-Nevado
- Departamento de Bioquímica y Biología Molecular, Edificio C-6, Campus Universitario de Rabanales, Universidad de Córdoba, 14071 Córdoba, Spain
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30
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Milioni D, Sado PE, Stacey NJ, Domingo C, Roberts K, McCann MC. Differential expression of cell-wall-related genes during the formation of tracheary elements in the Zinnia mesophyll cell system. PLANT MOLECULAR BIOLOGY 2001. [PMID: 11554474 DOI: 10.1023/a:1010647902487] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Plants, animals and some fungi undergo processes of cell specialization such that specific groups of cells are adapted to carry out particular functions. One of the more remarkable examples of cellular development in higher plants is the formation of water-conducting cells that are capable of supporting a column of water from the roots to tens of metres in the air for some trees. The Zinnia mesophyll cell system is a remarkable tool with which to study this entire developmental pathway in vitro. We have recently applied an RNA fingerprinting technology, to allow the detection of DNA fragments derived from RNA using cDNA synthesis and subsequent PCR-amplified fragment length polymorphisms (cDNA-AFLP), to systematically characterize hundreds of the genes involved in the process of tracheary element formation. Building hoops of secondary wall material is the key structural event in forming functional tracheary elements and we have identified over 50 partial sequences related to cell walls out of 600 differentially expressed cDNA fragments. The Zinnia system is an engine of gene discovery which is allowing us to identify and characterize candidate genes involved in cell wall biosynthesis and assembly.
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Affiliation(s)
- D Milioni
- Department of Cell and Developmental Biology, John Innes Centre, Norwich Research Park, Colney, UK
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31
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Ruperti B, Bonghi C, Rasori A, Ramina A, Tonutti P. Characterization and expression of two members of the peach 1-aminocyclopropane-1-carboxylate oxidase gene family. PHYSIOLOGIA PLANTARUM 2001; 111:336-344. [PMID: 11240918 DOI: 10.1034/j.1399-3054.2001.1110311.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The characterization and expression of PP-ACO1 and PP-ACO2, two members of the peach 1-aminocyclopropane-1-carboxylate (ACC) oxidase (ACO) gene family, are reported. PP-ACO1 is organized in 4 exons interrupted by 3 introns, whereas PP-ACO2 has only 2 of the 3 introns present in PP-ACO1. Comparison of the deduced amino acid sequences of PP-ACO1 and PP-ACO2 reveals a 77.7% identity. PP-ACO1 and PP-ACO2 show highest degree of similarity with petunia (PH-ACO3; 84.1%) and apple (85.4%) ACO genes, respectively. PP-ACO1 is expressed in flowers, fruitlet abscission zones, mesocarp and in young fully expanded leaves. PP-ACO1 transcript accumulation strongly increases during fruitlet abscission, in ripe mesocarp and senescing leaves, and is enhanced by propylene. PP-ACO2 mRNA accumulation is detected in fruits only during early development and is unaffected by propylene treatment. Both ACO genes are expressed in epicotyl and roots of growing seedlings, although a stronger accumulation of PP-ACO2 mRNA is observed.
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Affiliation(s)
- Benedetto Ruperti
- Department of Environmental Agronomy and Crop Science, University of Padova-Agripolis, I-35020 Legnaro (Padova), Italy
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32
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Shimizu T, Miyairi K, Okuno T. Determination of glycosylation sites, disulfide bridges, and the C-terminus of Stereum purpureum mature endopolygalacturonase I by electrospray ionization mass spectrometry. EUROPEAN JOURNAL OF BIOCHEMISTRY 2000; 267:2380-9. [PMID: 10759864 DOI: 10.1046/j.1432-1327.2000.01249.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Stereum purpureum endopolygalacturonase (endoPG; EC 3.2.1.15) is a causal protein for silver-leaf disease in apple trees. Endopolygalacturonase I, is a mixture of three components (Ia, Ib, and Ic) that produce three bands on SDS/PAGE but have the same polypeptide and sugar chains. Electrospray ionization mass spectrometry (ESI-MS) analysis of three endoPG I proteins and deglycosylated endoPG Ia revealed a molecular mass of 37 068, 38 285, and 39 503 for Ia, Ib, and Ic, respectively; the number of N-binding sugar chains matches that of a high-mannose type of sugar chain. Two, three, and four sugar chains are present in endoPG Ia, Ib, and Ic, respectively. Deletion of 44 amino acids from the deduced sequence occurred in the C-terminal region. Positions of the glycosylation sites and disulfide bridges were decided by tryptic digestion followed by liquid chromatography-electrospray mass spectrometry (LC-ESI-MS) analysis of reductive and nonreductive pyridylethylated endoPG I proteins. The glycosylated asparagines were determined to be Asn92 and 161; Asn92, 161, 279, or 302; and Asn92, 161, 279, and 302 in Ia, Ib, and Ic, respectively. Three disulfide bridges were noted at Cys3-Cys17, Cys175-Cys191, and Cys300-Cys303. These results are the first findings for fungal endoPG and may contribute to clarification of the relationship between stereostructure and catalytic activity.
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Affiliation(s)
- T Shimizu
- Department of Biochemistry and Biotechnology, Faculty of Agriculture and Life Science, Hirosaki University, City of Hirosaki, Aomori Prefecture, Japan
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33
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Wang ZY, MacRae EA, Wright MA, Bolitho KM, Ross GS, Atkinson RG. Polygalacturonase gene expression in kiwifruit: relationship to fruit softening and ethylene production. PLANT MOLECULAR BIOLOGY 2000; 42:317-328. [PMID: 10794531 DOI: 10.1023/a:1006309529922] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In kiwifruit, much of the softening process occurs prior to the respiratory climacteric and production of ethylene. This fruit therefore represents an excellent model system for dissecting the process of softening in the absence of endogenous ethylene production. We have characterized the expression of three polygalacturonase (PG) cDNA clones (CkPGA, B and C) isolated from fruit of Actinidia chinensis. Expression of CkPGA and B was detected by northern analysis only in fruit producing endogenous ethylene, and by RT-PCR in other tissues including flower buds, petals at anthesis, and senescent petals. CkPGA promoter fragments of 1296, 860 and 467 bp fused to the beta-glucuronidase (uidA) reporter gene directed fruit-specific gene expression during the climacteric in transgenic tomato. CkPGC gene expression was observed in softening fruit, and reached maximum levels (50-fold higher than for CkPGA and B) as fruit passed through the climacteric. However, expression of this gene was also readily detected during fruit development and in fruit harvested prior to the onset of softening. Using RT-PCR, expression of CkPGC was also detected at low levels in root tips and in senescent petals. These results suggest that PG expression is required not only during periods of cell wall degeneration, but also during periods of cell wall turnover and expansion.
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MESH Headings
- Amino Acid Sequence
- Base Sequence
- Blotting, Northern
- DNA, Complementary/chemistry
- DNA, Complementary/genetics
- DNA, Complementary/isolation & purification
- DNA, Plant/genetics
- Ethylenes/biosynthesis
- Fruit/enzymology
- Fruit/genetics
- Fruit/growth & development
- Gene Dosage
- Gene Expression Regulation, Developmental
- Gene Expression Regulation, Enzymologic
- Gene Expression Regulation, Plant
- Glucuronidase/genetics
- Glucuronidase/metabolism
- Solanum lycopersicum/genetics
- Molecular Sequence Data
- Plants, Genetically Modified/genetics
- Polygalacturonase/genetics
- Promoter Regions, Genetic/genetics
- RNA, Plant/genetics
- RNA, Plant/metabolism
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/metabolism
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Sequence Homology, Nucleic Acid
- Tissue Distribution
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Affiliation(s)
- Z Y Wang
- HortResearch, Mt Albert Research Centre, Auckland, New Zealand
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34
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Sitrit Y, Hadfield KA, Bennett AB, Bradford KJ, Downie AB. Expression of a polygalacturonase associated with tomato seed germination. PLANT PHYSIOLOGY 1999; 121:419-28. [PMID: 10517833 PMCID: PMC59404 DOI: 10.1104/pp.121.2.419] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/1999] [Accepted: 06/30/1999] [Indexed: 05/20/2023]
Abstract
Radicle protrusion from tomato (Lycopersicon esculentum Mill.) seeds to complete germination requires weakening of the endosperm tissue opposite the radicle tip. In common with other cell wall disassembly processes in plants, polygalacturonases (PGs) may be involved. Only calcium-dependent exo-PG activity was detected in tomato seed protein extracts. Chromatographic profiles of a partially acid-hydrolyzed fraction of polygalacturonic acid further digested with seed extract were consistent with the presence of only calcium-dependent exo-PG activity. In addition, a transcript encoding a previously unknown PG was detected prior to the completion of germination. The mRNA, produced from a gene (LeXPG1) estimated by Southern analysis to be represented once in the genome, was also present in flowers (anthers) and in lower amounts in roots and stems. LeXPG1 mRNA abundance was low during seed development, increased during imbibition, and was even greater in seeds that had completed germination. Expression of LeXPG1 during germination predominates in the endosperm cap and radicle tip, and in the radicle appears as a distinct band possibly associated with vascular tissue differentiation. We suggest that PG is involved in cell wall loosening of the endosperm necessary for radicle protrusion from tomato seeds and in subsequent embryo and seedling growth.
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Affiliation(s)
- Y Sitrit
- Department of Vegetable Crops, One Shields Avenue, University of California, Davis, California 95616-8631, USA
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35
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Nikolskaya AN, Pitkin JW, Schaeffer HJ, Ahn JH, Walton JD. EXG1p, a novel exo-beta1,3-glucanase from the fungus Cochliobolus carbonum, contains a repeated motif present in other proteins that interact with polysaccharides. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1425:632-6. [PMID: 9838227 DOI: 10.1016/s0304-4165(98)00117-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Genomic and cDNA copies of EXG1, a gene encoding an exo-beta1, 3-glucanase from the plant pathogenic fungus Cochliobolus carbonum, were isolated. The gene contains two introns of 50 and 53 bp, and the mRNA has a 5'-untranslated region of 90 nt and a 3'-untranslated region of 159 nt. The deduced protein product, EXG1p, has a predicted signal peptide of 17 amino acids, but based on the known N-terminus of the mature protein is further processed to remove an additional 25 amino acids. The sequence of EXG1p is not closely related to any other known protein, but has a low similarity (29% overall amino acid identity) to BGN13.1, an endo-beta1,3-glucanase from the mycoparasitic fungus Trichoderma harzianum. EXG1p contains two imperfect copies of a 23-amino acid motif that is found in several other proteins that interact with polysaccharides, including plant and bacterial polygalacturonases, phage neck appendage protein, phage endoneuramidase, and bacterial mannuronan epimerase.
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Affiliation(s)
- A N Nikolskaya
- Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824, USA
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36
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Atkinson RG, Bolitho KM, Wright MA, Iturriagagoitia-Bueno T, Reid SJ, Ross GS. Apple ACC-oxidase and polygalacturonase: ripening-specific gene expression and promoter analysis in transgenic tomato. PLANT MOLECULAR BIOLOGY 1998; 38:449-60. [PMID: 9747852 DOI: 10.1023/a:1006065926397] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Levels of 1-aminocyclopropane-1-carboxylate (ACC) oxidase and polygalacturonase (PG) mRNAs were characterized during ripening of Royal Gala, Braeburn and Granny Smith apples. Both ACC-oxidase and PG mRNAs were up-regulated in ripening fruit of all three cultivars. Expression in Royal Gala was detected earlier than in Braeburn and Granny Smith, relative to internal ethylene concentration. Genomic clones corresponding to the ACC-oxidase and PG mRNAs expressed in ripe apple fruit were isolated and ca. 2 kb of each promoter was sequenced. The start point of transcription in each gene was mapped by primer extension, and sequences homologous to elements in other ethylene-responsive or PG promoters were identified. The fruit specificity of the apple ACC-oxidase and PG promoters was investigated in transgenic tomato plants using a nested set of promoter fragments fused to the beta-glucuronidase (gusA) reporter gene. For the ACC-oxidase gene, 450 bp of 5' promoter sequence was sufficient to drive GUS expression, although this expression was not specific to ripening fruit. Larger fragments of 1966 and 1159 bp showed both fruit and ripening specificity. For the PG gene, promoter fragments of 1460 and 532 bp conferred ripening-specific expression in transgenic tomato fruit. However GUS expression was down-regulated by 2356 bp of promoter, suggesting the presence of a negative regulatory element between positions -1460 and -2356.
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MESH Headings
- Amino Acid Oxidoreductases/genetics
- Base Sequence
- Chromosome Mapping
- Cloning, Molecular
- DNA Primers/genetics
- Gene Expression Regulation, Developmental
- Gene Expression Regulation, Enzymologic
- Gene Expression Regulation, Plant
- Genes, Plant
- Genes, Reporter
- Glucuronidase/genetics
- Solanum lycopersicum/enzymology
- Solanum lycopersicum/genetics
- Solanum lycopersicum/growth & development
- Molecular Sequence Data
- Plants, Genetically Modified
- Polygalacturonase/genetics
- Promoter Regions, Genetic
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- RNA, Plant/genetics
- RNA, Plant/metabolism
- Rosales/enzymology
- Rosales/genetics
- Rosales/growth & development
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Affiliation(s)
- R G Atkinson
- Horticultural Research Institute of New Zealand, Mt Albert Research Centre, Auckland
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37
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Hadfield KA, Rose JK, Yaver DS, Berka RM, Bennett AB. Polygalacturonase gene expression in ripe melon fruit supports a role for polygalacturonase in ripening-associated pectin disassembly. PLANT PHYSIOLOGY 1998; 117:363-73. [PMID: 9625689 PMCID: PMC34956 DOI: 10.1104/pp.117.2.363] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/1997] [Accepted: 01/01/1998] [Indexed: 05/18/2023]
Abstract
Ripening-associated pectin disassembly in melon is characterized by a decrease in molecular mass and an increase in the solubilization of polyuronide, modifications that in other fruit have been attributed to the activity of polygalacturonase (PG). Although it has been reported that PG activity is absent during melon fruit ripening, a mechanism for PG-independent pectin disassembly has not been positively identified. Here we provide evidence that pectin disassembly in melon (Cucumis melo) may be PG mediated. Three melon cDNA clones with significant homology to other cloned PGs were isolated from the rapidly ripening cultivar Charentais (C. melo cv Reticulatus F1 Alpha) and were expressed at high levels during fruit ripening. The expression pattern correlated temporally with an increase in pectin-degrading activity and a decrease in the molecular mass of cell wall pectins, suggesting that these genes encode functional PGs. MPG1 and MPG2 were closely related to peach fruit and tomato abscission zone PGs, and MPG3 was closely related to tomato fruit PG. MPG1, the most abundant melon PG mRNA, was expressed in Aspergillus oryzae. The culture filtrate exponentially decreased the viscosity of a pectin solution and catalyzed the linear release of reducing groups, suggesting that MPG1 encodes an endo-PG with the potential to depolymerize melon fruit cell wall pectin. Because MPG1 belongs to a group of PGs divergent from the well-characterized tomato fruit PG, this supports the involvement of a second class of PGs in fruit ripening-associated pectin disassembly.
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Affiliation(s)
- K A Hadfield
- Department of Vegetable Crops, University of California, Davis, CA 95616, USA
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38
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Hadfield KA, Bennett AB. Polygalacturonases: many genes in search of a function. PLANT PHYSIOLOGY 1998; 117:337-43. [PMID: 9625687 PMCID: PMC1539180 DOI: 10.1104/pp.117.2.337] [Citation(s) in RCA: 187] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Affiliation(s)
- K A Hadfield
- Mann Laboratory, Department of Vegetable Crops, University of California, Davis, California 95616, USA
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39
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Fernández-Trujillo J, Artés F. Keeping quality of cold stored peaches using intermittent warming. Food Res Int 1997. [DOI: 10.1016/s0963-9969(97)00069-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Trainotti L, Spolaore S, Ferrarese L, Casadoro G. Characterization of ppEG1, a member of a multigene family which encodes endo-beta-1,4-glucanase in peach. PLANT MOLECULAR BIOLOGY 1997; 34:791-802. [PMID: 9278169 DOI: 10.1023/a:1005884429760] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Three cDNA clones (pCel 10, pCel 20 and pCel 30), each encoding different endo-beta-1,4-glucanases in peach, were obtained by RT-PCR and their expression investigated by northern analysis during leaf and fruit abscission and during fruit development. This analysis allowed the detection of only the pCel 10-related mRNA. A 2.2 kb transcript accumulated in ethylene activated abscission zones of leaves and fruits, and ppEG1 (Prunus persica endoglucanase 1) the gene coding for pCel 10, was isolated and characterized. A cDNA (termed pCel 1), containing the entire open reading frame of ppEGC1, was obtained and its sequence used to define the structure of the gene and the exon/intron boundaries. ppEG1 consists of 7 exons and encodes a 497 amino acid polypeptide including a putative signal peptide at the N-terminus. The similarity of this peach endo-beta-1,4-glucanase (EGase, EC 3.2.1.4) is high (76.3%) with the ripening avocado and low (47.3%) with the bean abscission EGase. A 1639 bp region at the 5' of the transcription start site shows regulatory functions in transgenic tobacco plants, as judged by its ability to drive GUS expression in cell separation-related events.
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Affiliation(s)
- L Trainotti
- Department of Biology, University of Padua, Italy
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Petersen M, Sander L, Child R, van Onckelen H, Ulvskov P, Borkhardt B. Isolation and characterisation of a pod dehiscence zone-specific polygalacturonase from Brassica napus. PLANT MOLECULAR BIOLOGY 1996; 31:517-27. [PMID: 8790285 DOI: 10.1007/bf00042225] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Seven distinct partial cDNAs, similar in sequence to previously described polygalacturonases (PGs), were amplified from cDNA derived from rape pod wall, dehiscence zone and leaves by the polymerase chain reaction. Northern analysis showed that one clone, PG35-8, was expressed at low levels in the dehiscence zone during the first five weeks after anthesis but was very abundantly expressed at week 6. In contrast, no PG35-8-related RNA was detected in the pod wall. Our data suggest that there are temporal and spatial correlations between the breakdown of the middle lamella, of the dehiscence zone cells and the pattern of synthesis of PG35-8 transcripts which may indicate a role for this particular PG in rape pod dehiscence. PG35-8 was used to isolate five cDNA clones from a rape dehiscence zone cDNA library. Restriction enzyme analysis and partial sequencing revealed that they were derived from four highly homologous transcripts which are probably allelic forms of a single gene. One full-length clone, RDPG1, was completely sequenced. The predicted protein of RDPG1 showed its highest identity with PG from apple fruit with an identity of 52%.
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Hotchkiss AT, El-Bahtimy K, Fishman ML. Analysis of Pectin Structure by HPAEC-PAD. PLANT CELL WALL ANALYSIS 1996. [DOI: 10.1007/978-3-642-60989-3_8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Kalaitzis P, Koehler SM, Tucker ML. Cloning of a tomato polygalacturonase expressed in abscission. PLANT MOLECULAR BIOLOGY 1995; 28:647-56. [PMID: 7647297 DOI: 10.1007/bf00021190] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Abscission, organ separation, is accompanied by cell wall breakdown in separation layer cells. In tomato (Lycopersicon esculentum), ethylene-induced abscission is correlated with an increase in polygalacturonase (PG) and endo-beta-1,4-D-glucanase (cellulase) activity. We have identified a putative, abscission-specific cDNA clone for PG, pTAPG1. The TAPG1 cDNA has 43% identity at the amino acid level with the tomato fruit PG. Genomic blot analysis suggests that the gene for TAPG1 is a member of a small subfamily of PG genes that is distinct from the tomato fruit PG. The TAPG1 cDNA hybridizes to mRNA expressed during the course of ethylene-induced leaf and flower abscission. A high level of PG transcript accumulation coincides with the occurrence of abscission. Auxin, an abscission inhibitor, and silver thiosulfate, an ethylene action inhibitor, suppressed accumulation of mRNA in leaf abscission zones complementary to the TAPG1 cDNA. Expression of TAPG1 transcripts is several-fold higher in flower abscission zones than in leaf abscission zones. The identification of cDNAs that encode abscission-specific PG provide and additional tool to study the regulation of abscission and cell wall dissolution in separation layer cells.
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Affiliation(s)
- P Kalaitzis
- Plant Molecular Biology Lab, USDA/ARS, BARC-West, Beltsville, MD 20705, USA
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