通过在营养生长阶段对耐旱和敏感小麦品种进行干旱预处理提高花后干旱胁迫耐受性。

Improved tolerance to post-anthesis drought stress by pre-drought priming at vegetative stages in drought-tolerant and -sensitive wheat cultivars.

作者信息

Abid Muhammad, Tian Zhongwei, Ata-Ul-Karim Syed Tahir, Liu Yang, Cui Yakun, Zahoor Rizwan, Jiang Dong, Dai Tingbo

机构信息

Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China.

Key Laboratory of Crop Physiology, Ecology and Production Management, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China.

出版信息

Plant Physiol Biochem. 2016 Sep;106:218-27. doi: 10.1016/j.plaphy.2016.05.003. Epub 2016 May 5.

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.

摘要

小麦作物在花后阶段为躲避干旱事件会遭受显著的减产损失。在前期干旱胁迫下进行干旱引发处理,可通过触发更快更强的防御机制来增强作物耐受后续干旱胁迫的能力。基于这些认识,我们设置了一组在田间持水量(FC)为55 - 60%的可控中度干旱胁迫,分别在分蘖期(费基斯2期)和拔节期(费基斯6期)对两个小麦品种鲁旱7号(耐旱型)和扬麦16号(干旱敏感型)进行引发处理。在开花后7天施加后续严重干旱胁迫,评估引发处理和未引发处理的植株、品种以及引发阶段的比较反应。结果表明,两个品种的引发处理植株通过改善叶片水势、增加叶绿素和核酮糖-1,5-二磷酸羧化酶/加氧酶含量、增强光合作用、更好的光保护以及高效的酶促抗氧化系统,表现出更高的耐受花后干旱胁迫的能力,从而导致产量降低较少。鲁旱7号的引发处理植株比扬麦16号表现出更高的适应干旱胁迫事件的能力。干旱引发处理对维持较高籽粒产量的积极作用在分蘖期引发处理的植株中比拔节期引发处理的植株更为显著。因此,引发处理植株中光合机构功能上调和高效的酶促抗氧化活性表明它们具有缓解随后发生的干旱胁迫的卓越潜力,这使得它们比未引发处理的植株产量降低更少。然而,基因型和引发阶段对干旱胁迫反应的差异也影响了引发处理植株耐受小麦花后干旱胁迫条件的能力。

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