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Li P, Wu Y, Han X, Li H, Wang L, Chen B, Yu S, Wang Z. BrrA02.LMI1 Encodes a Homeobox Protein That Affects Leaf Margin Development in Brassica rapa. Int J Mol Sci 2023; 24:14205. [PMID: 37762508 PMCID: PMC10532282 DOI: 10.3390/ijms241814205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 09/14/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023] Open
Abstract
Leaf margin morphology is an important quality trait affecting the commodity and environmental adaptability of crops. Brassica rapa is an ideal research material for exploring the molecular mechanisms underlying leaf lobe development. Here, we identified BrrA02.LMI1 to be a promising gene underlying the QTL qBrrLLA02 controlling leaf lobe formation in B. rapa, which was detected in our previous study. Sequence comparison analysis showed that the promoter divergences were the most obvious variations of BrrA02.LMI1 between parental lines. The higher expression level and promoter activity of BrrA02.LMI1 in the lobe-leafed parent indicated that promoter variations of BrrA02.LMI1 were responsible for elevating expression and ultimately causing different allele effects. Histochemical GUS staining indicated that BrrA02.LMI1 is mainly expressed at the leaf margin, with the highest expression at the tip of each lobe. Subcellular localization results showed that BrrA02.LMI1 was in the nucleus. The ectopic expression of BrrA02.LMI1 in A. thaliana resulted in a deep leaf lobe in the wild-type plants, and lobed leaf formation was disturbed in BrrA02.LMI11-downregulated plants. Our findings revealed that BrrA02.LMI1 plays a vital role in regulating the formation of lobed leaves, providing a theoretical basis for the selection and breeding of leaf-shape-diverse varieties of B. rapa.
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Affiliation(s)
- Pan Li
- State Key Laboratory of Vegetable Biobreeding, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China; (P.L.); (Y.W.); (X.H.); (H.L.); (L.W.); (B.C.); (S.Y.)
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
- Beijing Key Laboratory of Vegetable Germplasms Improvement, Beijing 100097, China
- Key Laboratory of Biology and Genetics Improvement of Horticultural Crops (North China), Beijing 100097, China
| | - Yudi Wu
- State Key Laboratory of Vegetable Biobreeding, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China; (P.L.); (Y.W.); (X.H.); (H.L.); (L.W.); (B.C.); (S.Y.)
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
- Beijing Key Laboratory of Vegetable Germplasms Improvement, Beijing 100097, China
- Key Laboratory of Biology and Genetics Improvement of Horticultural Crops (North China), Beijing 100097, China
| | - Xiangyang Han
- State Key Laboratory of Vegetable Biobreeding, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China; (P.L.); (Y.W.); (X.H.); (H.L.); (L.W.); (B.C.); (S.Y.)
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
- Beijing Key Laboratory of Vegetable Germplasms Improvement, Beijing 100097, China
- Key Laboratory of Biology and Genetics Improvement of Horticultural Crops (North China), Beijing 100097, China
| | - Hui Li
- State Key Laboratory of Vegetable Biobreeding, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China; (P.L.); (Y.W.); (X.H.); (H.L.); (L.W.); (B.C.); (S.Y.)
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
- Beijing Key Laboratory of Vegetable Germplasms Improvement, Beijing 100097, China
- Key Laboratory of Biology and Genetics Improvement of Horticultural Crops (North China), Beijing 100097, China
| | - Limin Wang
- State Key Laboratory of Vegetable Biobreeding, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China; (P.L.); (Y.W.); (X.H.); (H.L.); (L.W.); (B.C.); (S.Y.)
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
- Beijing Key Laboratory of Vegetable Germplasms Improvement, Beijing 100097, China
- Key Laboratory of Biology and Genetics Improvement of Horticultural Crops (North China), Beijing 100097, China
| | - Bin Chen
- State Key Laboratory of Vegetable Biobreeding, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China; (P.L.); (Y.W.); (X.H.); (H.L.); (L.W.); (B.C.); (S.Y.)
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
- Beijing Key Laboratory of Vegetable Germplasms Improvement, Beijing 100097, China
- Key Laboratory of Biology and Genetics Improvement of Horticultural Crops (North China), Beijing 100097, China
| | - Shuancang Yu
- State Key Laboratory of Vegetable Biobreeding, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China; (P.L.); (Y.W.); (X.H.); (H.L.); (L.W.); (B.C.); (S.Y.)
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
- Beijing Key Laboratory of Vegetable Germplasms Improvement, Beijing 100097, China
- Key Laboratory of Biology and Genetics Improvement of Horticultural Crops (North China), Beijing 100097, China
| | - Zheng Wang
- State Key Laboratory of Vegetable Biobreeding, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China; (P.L.); (Y.W.); (X.H.); (H.L.); (L.W.); (B.C.); (S.Y.)
- National Engineering Research Center for Vegetables, Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing 100097, China
- Beijing Key Laboratory of Vegetable Germplasms Improvement, Beijing 100097, China
- Key Laboratory of Biology and Genetics Improvement of Horticultural Crops (North China), Beijing 100097, China
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Lambert P, Confolent C, Heurtevin L, Dlalah N, Signoret V, Quilot-Turion B, Pascal T. Insertion of a mMoshan transposable element in PpLMI1, is associated with the absence or globose phenotype of extrafloral nectaries in peach [Prunus persica (L.) Batsch]. HORTICULTURE RESEARCH 2022; 9:uhab044. [PMID: 35039854 PMCID: PMC8829895 DOI: 10.1093/hr/uhab044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 08/14/2021] [Accepted: 09/17/2021] [Indexed: 06/14/2023]
Abstract
Most commercial peach [Prunus persica (L.) Batsch] cultivars have leaves with extrafloral nectaries (EFNs). Breeders have selected this character over time, as they observed that the eglandular phenotype resulted in high susceptibility to peach powdery mildew, a major disease of peach trees. EFNs are controlled by a Mendelian locus (E), mapped on chromosome 7. However, the genetic factor underlying E was unknown. In order to address this point, we developed a mapping population of 833 individuals derived from the selfing of "Malo Konare", a Bulgarian peach cultivar, heterozygous for the trait. This progeny was used to investigate the E-locus region, along with additional resources including peach genomic resequencing data, and 271 individuals from various origins used for validation. High-resolution mapping delimited a 40.6 kbp interval including the E-locus and four genes. Moreover, three double-recombinants allowed identifying Prupe.7G121100, a LMI1-like homeodomain leucine zipper (HD-Zip) transcription factor, as a likely candidate for the trait. By comparing peach genomic resequencing data from individuals with contrasted phenotypes, a MITE-like transposable element of the hAT superfamily (mMoshan) was identified in the third exon of Prupe.7G121100. It was associated with the absence or globose phenotype of EFNs. The insertion of the transposon was positively correlated with enhanced expression of Prupe.7G121100. Furthermore, a PCR marker designed from the sequence-variants, allowed to properly assign the phenotypes of all the individuals studied. These findings provide valuable information on the genetic control of a trait poorly known so far although selected for a long time in peach.
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Affiliation(s)
| | - Carole Confolent
- INRAE, GAFL, Montfavet, F-84143, FRANCE
- INRAE, UMR GDEC, Clermont-Ferrand, F-63100, FRANCE
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