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Abscisic acid and hydrogen peroxide are involved in drought priming-induced drought tolerance in wheat (Triticum aestivum L.).
Plant Biology ( IF 4.2 ) Pub Date : 2020-06-12 , DOI: 10.1111/plb.13143 X Wang 1 , J Zhang 1 , J Song 1 , M Huang 1 , J Cai 1 , Q Zhou 1 , T Dai 1 , D Jiang 1
中文翻译：
脱落酸和过氧化氢参与小麦（Triticum aestivum L.）的干旱引发诱导的耐旱性。
更新日期：2020-06-12
Plant Biology ( IF 4.2 ) Pub Date : 2020-06-12 , DOI: 10.1111/plb.13143 X Wang 1 , J Zhang 1 , J Song 1 , M Huang 1 , J Cai 1 , Q Zhou 1 , T Dai 1 , D Jiang 1
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- Drought is one of the major stress factors in wheat production on a global scale. Drought priming during the early growth stage can enhance drought tolerance in wheat (Triticum aestivum L.). Abscisic acid (ABA) and hydrogen peroxide (H2O2) are important signal molecules in the adaptation of plants to drought stress. However, the roles of ABA and H2O2 in drought priming‐induced drought tolerance are not clear.
- In the present study, we evaluated the responses of wheat to an ABA inhibitor, H2O2 scavenger and an inhibitor to investigate the (i) relationship between ABA and H2O2 in osmotic adjustment after drought priming in the vegetative stage and (ii) responses to drought stress during grain filling.
- In the drought priming alone treatments, chemical application resulted in the scavenging of ABA and H2O2, weakening the alleviation effects of drought priming on drought stress, as demonstrated by the lower leaf water potential and grain yield. The ABA inhibitor completely inhibited accumulation of ABA and H2O2; the ABA inhibitor inhibited respiratory burst oxidase homologue expression, whereas the H2O2 inhibitor resulted in higher 9‐cis‐epoxycarotenoid dioxygenase expression and ABA concentration in primed plants, indicating that ABA scavenging inhibited H2O2 biosynthesis while H2O2 scavenging did not inhibit ABA biosynthesis. The results further demonstrated that NADPH oxidase‐mediated H2O2 production functions downstream of ABA, which induces osmolyte transcript expression and accumulation, and thus contributes to drought priming‐induced stress tolerance.
- These results provide a theoretical basis for a better understanding of the mechanisms involved in drought priming‐induced tolerance in wheat plants.
中文翻译：
脱落酸和过氧化氢参与小麦（Triticum aestivum L.）的干旱引发诱导的耐旱性。
- 干旱是全球范围内小麦生产的主要压力因素之一。生育初期的干旱引发可以增强小麦的耐旱性（Triticum aestivum L.）。脱落酸（ABA）和过氧化氢（H 2 O 2）是植物适应干旱胁迫的重要信号分子。但是，尚不清楚ABA和H 2 O 2在干旱引发的干旱耐受性中的作用。
- 在本研究中，我们评估了小麦对ABA抑制剂，H 2 O 2清除剂和抑制剂的反应，以研究（i）营养期干旱引发后渗透调节中ABA和H 2 O 2之间的关系，以及（ ii）籽粒灌浆期间对干旱胁迫的反应。
- 在单独的干旱引发处理中，化学施用导致了ABA和H 2 O 2的清除，削弱了干旱引发对干旱胁迫的缓解作用，这表现为较低的叶片水势和籽粒产量。ABA抑制剂完全抑制ABA和H 2 O 2的积累; ABA抑制剂抑制呼吸猝发氧化酶同源物表达，而H 2 O 2抑制剂在引发的植物中导致9-顺式-环氧类胡萝卜素双加氧酶表达和ABA浓度升高，表明ABA清除抑制H 2 O 2的生物合成，而H2 O 2清除不抑制ABA的生物合成。结果进一步证明，NADPH氧化酶介导的H 2 O 2的产生在ABA的下游起作用，从而诱导渗透液转录物的表达和积累，从而促进干旱引发的胁迫耐受性。
- 这些结果为更好地了解干旱引发的小麦植物耐性机制提供了理论基础。
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