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Abid M, Shao Y, Liu S, Wang F, Gao J, Jiang D, Tian Z, Dai T. Pre-drought priming sustains grain development under post-anthesis drought stress by regulating the growth hormones in winter wheat (Triticum aestivum L.). Planta 2017; 246:509-524. [PMID: 28526982 DOI: 10.1007/s00425-017-2698-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 01/25/2017] [Accepted: 04/13/2017] [Indexed: 05/03/2023]
Abstract
Drought stress during grain filling is the most yield-damaging to wheat. Pre-drought priming facilitated the wheat plants to sustain grain development against the post-anthesis drought stress by modulating the levels of growth hormones. Post-anthesis drought stress substantially reduces grain yield in wheat (Triticum aestivum L.) due to impaired grain development associated with imbalanced levels of growth hormones. To investigate whether pre-drought priming could sustain grain development in wheat by regulating favorable levels of growth hormones under post-anthesis drought conditions, the plants of a drought-sensitive (Yangmai-16) and drought-tolerant (Luhan-7) wheat cultivar were exposed to a moderate drought stress during tillering (Feekes 2 stage) for priming, and then, a subsequent severe drought stress was applied from 7 to 14 days after anthesis. The results showed that drought-stressed plants of both cultivars showed a decline in flag leaf water potential, chlorophyll contents, photosynthetic rate, grain size initiation, and grain filling as compared to well-watered plants; however, decline in these traits was less in pre-drought primed (PD) plants than in nonprimed (ND) plants. Under drought stress, the PD plants regulated higher concentrations of zeatin and zeatin riboside, indole-3-acetic acid, gibberellins, and lower abscisic acid content in grains, resulting in higher endosperm cell division and expansion, grain size initiation, grain-filling rate and duration, and finally higher grain dry weights as compared to ND plants. The PD plants of both cultivars showed higher potential to tolerate the post-anthesis drought stress, but more effect was displayed by drought-tolerant cultivar. From the achieved results, it was concluded that pre-drought priming facilitated the wheat plants to sustain higher grain development and yield against the most yield-damaging post-anthesis drought stress by modulating the levels of growth hormones.
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Affiliation(s)
- Muhammad Abid
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
- Department of Soil and Water Conservation, Soon Valley, Khushab, Punjab, 41000, Pakistan
| | - Yuhang Shao
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Sixi Liu
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Feng Wang
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Jingwen Gao
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Dong Jiang
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Zhongwei Tian
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Tingbo Dai
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China.
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Abid M, Tian Z, Ata-Ul-Karim ST, Liu Y, Cui Y, Zahoor R, Jiang D, Dai T. Improved tolerance to post-anthesis drought stress by pre-drought priming at vegetative stages in drought-tolerant and -sensitive wheat cultivars. Plant Physiol Biochem 2016; 106:218-27. [PMID: 27179928 DOI: 10.1016/j.plaphy.2016.05.003] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [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: 04/07/2016] [Revised: 05/04/2016] [Accepted: 05/04/2016] [Indexed: 05/03/2023]
Abstract
Wheat crop endures a considerable penalty of yield reduction to escape the drought events during post-anthesis period. Drought priming under a pre-drought stress can enhance the crop potential to tolerate the subsequent drought stress by triggering a faster and stronger defense mechanism. Towards these understandings, a set of controlled moderate drought stress at 55-60% field capacity (FC) was developed to prime the plants of two wheat cultivars namely Luhan-7 (drought tolerant) and Yangmai-16 (drought sensitive) during tillering (Feekes 2 stage) and jointing (Feekes 6 stage), respectively. The comparative response of primed and non-primed plants, cultivars and priming stages was evaluated by applying a subsequent severe drought stress at 7 days after anthesis. The results showed that primed plants of both cultivars showed higher potential to tolerate the post-anthesis drought stress through improved leaf water potential, more chlorophyll, and ribulose-1, 5-bisphosphate carboxylase/oxygenase contents, enhanced photosynthesis, better photoprotection and efficient enzymatic antioxidant system leading to less yield reductions. The primed plants of Luhan-7 showed higher capability to adapt the drought stress events than Yangmai-16. The positive effects of drought priming to sustain higher grain yield were pronounced in plants primed at tillering than those primed at jointing. In consequence, upregulated functioning of photosynthetic apparatus and efficient enzymatic antioxidant activities in primed plants indicated their superior potential to alleviate a subsequently occurring drought stress, which contributed to lower yield reductions than non-primed plants. However, genotypic and priming stages differences in response to drought stress also contributed to affect the capability of primed plants to tolerate the post-anthesis drought stress conditions in wheat.
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Affiliation(s)
- Muhammad Abid
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China
| | - Zhongwei Tian
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China
| | - Syed Tahir Ata-Ul-Karim
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China
| | - Yang Liu
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China
| | - Yakun Cui
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China
| | - Rizwan Zahoor
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China
| | - Dong Jiang
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China
| | - Tingbo Dai
- Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China.
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