Mepiquat chloride-priming induced salt tolerance during seed germination of cotton (Gossypium hirsutum L.) through regulating water transport and K+/Na+ homeostasis
Mepiquat chloride-priming induced salt tolerance during seed germination of cotton (Gossypium hirsutum L.) through regulating water transport and K+/Na+ homeostasis
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缩节素引发剂通过调节水分运输和 K/Na 稳态诱导棉花 (Gossypium hirsutum L.) 种子萌发过程中的耐盐性
DOI：
10.1016/j.envexpbot.2018.12.024
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发表时间：
2019-03
影响因子：
5.7
通讯作者：
Yan Gentu
中科院分区：
文献类型：
--
作者：
Wang Ning;Wang Xiangru;Shi Jianbin;Liu Xiaohong;Xu Qinghua;Zhou Hong;Song Meizhen;Yan Gentu
以4个棉花品种为材料，研究了缩节胺（MC）对盐胁迫下棉花种子萌发的缓解作用。根据生理生态数据，CCRI 44，CCRI 49和Z571对盐胁迫不太敏感，并依赖于耐盐策略来对抗萌发时的盐度。与耐盐品种相反，盐胁迫显著抑制了CZ 91的种子萌发，但大多数未萌发的种子在转移到蒸馏水中后完全恢复，表明CZ 91遵循避盐策略。用MC引发种子可消除耐盐品种（尤其是品种Z571）的盐胁迫负面效应，但在避盐品种CZ 91中没有观察到显著的反应。在机制水平上，暴露于盐胁迫时，MC引发调节三种互补的生理性状：（i）通过增加水渗透性和溶质（即，（2）通过调节PIP调节的水通道，提高Na+或K+的迁移率;（3）通过多种离子转运蛋白（如SOS、HKT 1、NHX 1、AKT 1和HAK 5）的协同调节，积极维持Na+和K+的稳态，提高组织的耐受能力;（4）通过诱导H+-ATP酶基因的表达，进一步增强离子转运系统的功能。这三个生理性状的强度在MC预处理的品种之间存在差异，赋予不同的改善作用。综上所述，我们的观察证实，MC引发缓解盐胁迫的效果是相当复杂的，并依赖于品种。这也阐明了水分和关键离子转运系统的转录调控参与维持水分吸收和K+/Na+稳态作为一个关键属性诱导耐盐性MC引发棉花品种。
The present study aimed to demonstrate the role of mepiquat chloride (MC) on the alleviation of the damaging effects of salinity on the germination of four cotton cultivars. Based on the ecophysiological data, CCRI44, CCRI49, and Z571 were less sensitive to salt stress and relied on a salt tolerance strategy to combat salinity at germination. Contrary to those salt-tolerance cultivars, seed germination of CZ91 was significantly inhibited by salt stress but most un-germinated seeds recovered completely when transferred to distilled water, indicating CZ91 follow a salt-avoiding strategy. Priming seeds with MC resulted in nullifying the negative effects of salt stress in salt-tolerance cultivars (especially in the cultivar Z571), but no significant response was observed in the salt-avoiding cultivar CZ91. At the mechanistic level, three complementary physiological traits are modulated by MC-priming upon exposure to salt stress: (i) better OA via increasing the water permeability and solute (i.e., Na+or K+) mobility probably by regulating PIPs-regulated water channels; (ii) higher tissue tolerance ability via positively maintaining Na+and K+homeostasis by co-ordinated regulation of multiple ion transporters (e.g.SOS,HKT1,NHX1,AKT1andHAK5); and (iii) further enhance the function of ion transport systems via inducing the gene expression of H+-ATPase. The strength of the three physiological traits varied among the MC pretreated cultivars, conferring differential ameliorating roles. Taken together, our observations confirmed that the effect of MC-priming on the alleviation of salinity stress is quite complex and dependent on the cultivar. It also shed light on transcriptional regulation of water and key ion transport systems involved in the maintenance of water absorption and K+/Na+homeostasis as a key attribute for inducing salt tolerance by MC-priming in cotton cultivars.
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影响因子：
0.8
作者：
F. A. Oliveira;J. F. Medeiros;F. A. Oliveira;M. K. T. D. Oliveira;A. G. Freire
通讯作者：
F. A. Oliveira;J. F. Medeiros;F. A. Oliveira;M. K. T. D. Oliveira;A. G. Freire
影响因子：
4
作者：
Assaha DVM;Ueda A;Saneoka H;Al-Yahyai R;Yaish MW
通讯作者：
Yaish MW
影响因子：
5.6
作者：
Liu R;Wang L;Tanveer M;Song J
通讯作者：
Song J
影响因子：
6.9
作者：
Chakraborty K;Bose J;Shabala L;Shabala S
通讯作者：
Shabala S
影响因子：
5.6
作者：
Zhang WD;Wang P;Bao Z;Ma Q;Duan LJ;Bao AK;Zhang JL;Wang SM
通讯作者：
Wang SM