Improved tolerance to post-anthesis drought stress by pre-drought priming at vegetative stages in drought-tolerant and -sensitive wheat cultivars
Improved tolerance to post-anthesis drought stress by pre-drought priming at vegetative stages in drought-tolerant and -sensitive wheat cultivars
复制标题
通过在耐旱和敏感小麦品种的营养阶段进行干旱前引发，提高对花后干旱胁迫的耐受性
DOI：
10.1016/j.plaphy.2016.05.003
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发表时间：
2016-09-01
影响因子：
6.5
通讯作者：
Dai, Tingbo
中科院分区：
文献类型：
--
作者：
Abid, Muhammad;Tian, Zhongwei;Dai, Tingbo
小麦作物在开花后遭受了相当大的减产损失，以逃避干旱事件。在干旱胁迫前的干旱引发可以通过触发更快、更强的防御机制来增强作物耐受随后干旱胁迫的潜力。针对这些认识，我们设计了一套控制在55-60%田间持水量（FC）的中度干旱胁迫，分别在分蘖期（Feekes 2期）和拔节期（Feekes 6期）对两个小麦品种鲁旱7号（耐旱）和扬麦16号（干旱敏感）进行启动。通过在开花后7天施加随后的严重干旱胁迫来评估引发和非引发植物、品种和引发阶段的比较响应。结果表明，两个品种的引发植株通过提高叶片水势、叶绿素含量、核酮糖-1，5-二磷酸羧化酶/加氧酶含量、增强光合作用、增强光保护和有效的酶促抗氧化系统，表现出更强的耐旱能力，从而降低了产量。鲁旱7号的启动植株对干旱胁迫的适应能力强于扬麦16。干旱引发对维持较高产量的积极作用在分蘖期引发的植株中比在拔节期引发的植株中明显。因此，上调功能的光合机构和有效的酶的抗氧化活性在引发的植物表明其上级潜力，以减轻随后发生的干旱胁迫，这有助于较低的产量下降比非引发的植物。然而，基因型和引发阶段对干旱胁迫的反应差异也有助于影响引发植株耐受花后干旱胁迫条件的能力。(C)2016年由Elsevier Masson SAS出版。
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 postanthesis drought stress conditions in wheat. (C) 2016 Published by Elsevier Masson SAS.