Drought priming during the vegetative stage can enhance post-anthesis drought tolerance by improving photosynthetic capacity in winter wheat
Drought priming during the vegetative stage can enhance post-anthesis drought tolerance by improving photosynthetic capacity in winter wheat
复制标题
营养期干旱引发可通过提高冬小麦的光合能力来增强花后耐旱能力
DOI：
10.1080/15324982.2018.1531440
复制
发表时间：
2019-04-03
影响因子：
1.4
通讯作者：
Dai, Tingbo
中科院分区：
文献类型：
--
作者：
Cui, Yakun;Tian, Zhongwei;Dai, Tingbo
粮食作物生育期干旱胁迫导致作物显著减产，因此，探索有效的方法提高对花后干旱的耐受性是十分必要的。通过盆栽试验，研究了花后干旱胁迫下，干旱预引发对水稻生理特性和产量的影响。在分蘖期或拔节期对优质小麦植株施加中度水分亏缺(占田间持水量的60%~65%)，而在灌浆期施加严重干旱胁迫(占田间持水量的40%~45%)。引发处理显着提高了籽粒产量，导致了较高的生物量。与对照相比，不引发处理、分蘖引发处理和拔节引发处理的产量和生物量分别降低15.7%、9.1%、9.3%和11.1%、6.1%、10.5%。处理后的植株表现出对灌浆期严重干旱胁迫的较强适应性，表现出较高的光合作用能力和光能利用效率，叶片水势、可溶性蛋白质含量和Rubisco含量较高，酶促抗氧化系统增强。根据观测到的粮食产量，分蘖阶段对干旱引发的反应更敏感。这些结果表明，营养生长期适度干旱有利于发展节水农业，应对灌浆期干旱胁迫。
Drought stress during the reproductive period of cereal crops leads to significant yield reductions, therefore, exploring effective methods to improve tolerance to post-anthesis drought is necessary. Pot experiment was carried out to investigate the effects of pre-drought priming on physiological characteristics and grain yield with drought stress at post-anthesis. Moderate water deficits (60-65% of the field capacity) were imposed to prime wheat plants during either the tillering or jointing stages, while severe drought stress (40-45% of the field capacity) was applied during the grain filling stage. The priming treatments significantly improved grain yield resulting in higher biomass. Compared to the control, the grain yield and biomass of the non-priming, tillering priming, and jointing priming treatments were reduced by 15.7, 9.1, and 9.3% and by 11.1, 6.1, and 10.5%, respectively. The primed plants exhibited higher adaptability to subsequent severe drought stress during grain filling, showing higher photosynthetic capacities and light use efficiencies with higher leaf water potentials, soluble protein contents, and Rubisco contents and enhanced enzymatic antioxidant systems. The tillering stage is more responsive to drought priming based on the observed grain yield. These results indicate that moderate drought during the vegetative period is conducive to the development of water-saving agriculture to cope drought stress during grain-filling in wheat.