1
|
Kavi Kishor PB, Tiozon RN, Fernie AR, Sreenivasulu N. Abscisic acid and its role in the modulation of plant growth, development, and yield stability. Trends Plant Sci 2022; 27:1283-1295. [PMID: 36100537 DOI: 10.1016/j.tplants.2022.08.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 07/28/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Abscisic acid (ABA) is known to confer stress tolerance; however, at elevated levels it impairs plant growth under prolonged stress. Paradoxically, at its basal level, ABA plays many vital roles in promoting plant growth and development, including modulation of tillering, flowering, and seed development, as well as seed maturation. In this review, we provide insight into novel discoveries of ABA fluxes, ABA signaling responses, and their impact on yield stability. We discuss ABA homeostasis implicated under pre- and postanthesis drought and its impact on productive tillers, grain number determination, and seed development to address yield stability in cereal crops while considering the new knowledge that emerged from the model plant systems.
Collapse
Affiliation(s)
- Polavarapu B Kavi Kishor
- Department of Biotechnology, Vignan's Foundation for Science, Technology & Research (Deemed to be University), Vadlamudi, Guntur 522 213, Andhra Pradesh, India
| | - Rhowell N Tiozon
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Muhlenberg 1, 14476 Potsdam-Golm, Germany; International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines
| | - Alisdair R Fernie
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Muhlenberg 1, 14476 Potsdam-Golm, Germany
| | - Nese Sreenivasulu
- International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines.
| |
Collapse
|
2
|
Santosh Kumar VV, Yadav SK, Verma RK, Shrivastava S, Ghimire O, Pushkar S, Rao MV, Senthil Kumar T, Chinnusamy V. The abscisic acid receptor OsPYL6 confers drought tolerance to indica rice through dehydration avoidance and tolerance mechanisms. J Exp Bot 2021; 72:1411-1431. [PMID: 33130892 DOI: 10.1093/jxb/eraa509] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 10/27/2020] [Indexed: 06/11/2023]
Abstract
Abscisic acid (ABA) is a key regulator of plant development and stress tolerance. Here we report functional validation of the ABA receptor OsPYL6 by constitutive and stress-inducible overexpression and RNAi silencing, in an indica rice cultivar 'Pusa Sugandh 2'. Overexpression of OsPYL6 conferred ABA hypersensitivity during germination and promoted total root length. Overexpression and RNAi silencing of OsPYL6 resulted in enhanced accumulation of ABA in seedlings under non-stress conditions, at least, in part through up-regulation of different 9-cis epoxycarotenoid dioxygenase (NCED )genes. This suggests that PYL6 expression is crucial for ABA homeostasis. Analysis of drought tolerance of OsPYL6 transgenic and wild type plants showed that OsPYL6 overexpression enhanced the expression of stress-responsive genes and dehydration tolerance. Transgenic rice plants overexpressing OsPYL6 with AtRD29A (Arabidopsis thaliana Responsive to Dehydration 29A) promoter also exhibited about 25% less whole plant transpiration, compared with wild type plants under drought, confirming its role in activation of dehydration avoidance mechanisms. However, overexpression of PYL6 reduced grain yield under non-stress conditions due to reduction in height, biomass, panicle branching and spikelet fertility. RNAi silencing of OsPYL6 also reduced grain yield under drought. These results showed that rice OsPYL6 is a key regulator of plant development and drought tolerance, and fine-tuning of its expression is critical for improving yield and stress tolerance.
Collapse
Affiliation(s)
- V V Santosh Kumar
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
- Department of Botany, Bharthidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Shashank Kumar Yadav
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Rakesh Kumar Verma
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
- Department of Botany, Bharthidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Sanya Shrivastava
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Omprakash Ghimire
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Suchitra Pushkar
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | | | | | - Viswanathan Chinnusamy
- Division of Plant physiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| |
Collapse
|
3
|
Hosseini SA, Hajirezaei MR, Seiler C, Sreenivasulu N, von Wirén N. A Potential Role of Flag Leaf Potassium in Conferring Tolerance to Drought-Induced Leaf Senescence in Barley. Front Plant Sci 2016; 7:206. [PMID: 26955376 PMCID: PMC4768371 DOI: 10.3389/fpls.2016.00206] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Accepted: 02/06/2016] [Indexed: 05/03/2023]
Abstract
Terminal drought stress decreases crop yields by inducing abscisic acid (ABA) and premature leaf senescence. As potassium (K) is known to interfere with ABA homeostasis we addressed the question whether there is genetic variability regarding the role of K nutrition in ABA homeostasis and drought tolerance. To compare their response to drought stress, two barley lines contrasting in drought-induced leaf senescence were grown in a pot experiment under high and low K supply for the analysis of flag leaves from the same developmental stage. Relative to the drought-sensitive line LPR, the line HPR retained more K in its flag leaves under low K supply and showed delayed flag leaf senescence under terminal drought stress. High K retention was further associated with a higher leaf water status, a higher concentration of starch and other primary carbon metabolites. With regard to ABA homeostasis, HPR accumulated less ABA but higher levels of the ABA degradation products phaseic acid (PA) and dehydro-PA. Under K deficiency this went along with higher transcript levels of ABA8'-HYDROXYLASE, encoding a key enzyme in ABA degradation. The present study provides evidence for a positive impact of the K nutritional status on ABA homeostasis and carbohydrate metabolism under drought stress. We conclude that genotypes with a high K nutritional status in the flag leaf show superior drought tolerance by promoting ABA degradation but attenuating starch degradation which delays flag leaf senescence. Flag leaf K levels may thus represent a useful trait for the selection of drought-tolerant barley cultivars.
Collapse
Affiliation(s)
- Seyed A. Hosseini
- Molecular Plant Nutrition Group, Physiology and Cell Biology, Leibniz-Institute of Plant Genetics and Crop Plant ResearchGatersleben, Germany
| | - Mohammad R. Hajirezaei
- Molecular Plant Nutrition Group, Physiology and Cell Biology, Leibniz-Institute of Plant Genetics and Crop Plant ResearchGatersleben, Germany
| | - Christiane Seiler
- Abiotic Stress Genomics Group, Molecular Genetics, Leibniz-Institute of Plant Genetics and Crop Plant ResearchGatersleben, Germany
| | - Nese Sreenivasulu
- Abiotic Stress Genomics Group, Molecular Genetics, Leibniz-Institute of Plant Genetics and Crop Plant ResearchGatersleben, Germany
| | - Nicolaus von Wirén
- Molecular Plant Nutrition Group, Physiology and Cell Biology, Leibniz-Institute of Plant Genetics and Crop Plant ResearchGatersleben, Germany
| |
Collapse
|
4
|
Palaniyandi SA, Chung G, Kim SH, Yang SH. Molecular cloning and characterization of the ABA-specific glucosyltransferase gene from bean (Phaseolus vulgaris L.). J Plant Physiol 2015; 178:1-9. [PMID: 25747288 DOI: 10.1016/j.jplph.2015.01.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Revised: 01/16/2015] [Accepted: 01/20/2015] [Indexed: 05/18/2023]
Abstract
Levels of the plant hormone abscisic acid (ABA) are maintained in homeostasis by a balance of its biosynthesis, catabolism and conjugation. The detailed molecular and signaling events leading to strict homeostasis are not completely understood in crop plants. In this study, we obtained cDNA of an ABA-inducible, ABA-specific UDP-glucosyltransferase (ABAGT) from the bean plant (Phaseolus vulgaris L.) involved in conjugation of a glucose residue to ABA to form inactive ABA-glucose ester (ABA-GE) to examine its role during development and abiotic stress in bean. The bacterially expressed PvABAGTase enzyme showed ABA-specific glucosylation activity in vitro. A higher level of the PvABAGT transcript was observed in mature leaves, mature flowers, roots, seed coats and embryos as well as upon rehydration following a period of dehydration. Overexpression of 35S::PvABAGT in Arabidopsis showed reduced sensitivity to ABA compared with WT. The transgenic plants showed a high level of ABA-GE without significant decrease in the level of ABA compared with the wild type (WT) during dehydration stress. Upon rehydration, the levels of ABA and phaseic acid (PA) decreased in the WT and the PvABAGT-overexpressing lines with high levels of ABA-GE only in the transgenic plants. Our findings suggest that the PvABAGT gene could play a role in ABA homeostasis during development and stress responses in bean and its overexpression in Arabidopsis did not alter ABA homeostasis during dehydration stress.
Collapse
Affiliation(s)
- Sasikumar Arunachalam Palaniyandi
- Center for Nutraceutical and Pharmaceutical Materials, Myongji University, Cheoin-gu, Yongin 449-728, Gyeonggi-Do, Republic of Korea
| | - Gyuhwa Chung
- Department of Biotechnology, Chonnam National University, Chonnam, 550-749 Yeosu, Republic of Korea
| | - Sang Hyon Kim
- Division of Bioscience and Bioinformatics, College of Natural Science, Myongji University, Cheoin-gu, Yongin 449-728, Gyeonggi-Do, Republic of Korea.
| | - Seung Hwan Yang
- Center for Nutraceutical and Pharmaceutical Materials, Myongji University, Cheoin-gu, Yongin 449-728, Gyeonggi-Do, Republic of Korea.
| |
Collapse
|
5
|
Dong T, Hwang I. Contribution of ABA UDP-glucosyltransferases in coordination of ABA biosynthesis and catabolism for ABA homeostasis. Plant Signal Behav 2014; 9:e28888. [PMID: 25763481 PMCID: PMC4091422 DOI: 10.4161/psb.28888] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The phytohormone abscisic acid (ABA) plays a crucial role in numerous aspects of plant growth and environmental stress responses. Endogenous ABA levels are regulated by a balance between its biosynthetic and catabolic activities. This balance may occur at multiple levels and includes the expression of genes involved in these processes. ABA UDP-glucosyltransferase (UGT), the major player in the ABA conjugation pathway, has been shown to have a marginal effect on free ABA levels. However, recent studies provide new insight into the importance of the ABA conjugation pathway in contributing to the control of ABA homeostasis. Gain-of-function and loss-of-function mutant analyses have revealed that UGT71B6, an ABA UGT, and its 2 closely related homologs, UGT71B7 and UGT71B8, play a crucial role in ABA homeostasis and in adaptation to various abiotic stresses.
Collapse
|