Mesophyll cells' ability to maintain potassium is correlated with drought tolerance in tea (Camellia sinensis)
Mesophyll cells' ability to maintain potassium is correlated with drought tolerance in tea (Camellia sinensis)
复制标题
叶肉细胞维持钾的能力与茶（Camellia sinensis）的耐旱性相关
DOI：
10.1016/j.plaphy.2019.01.020
复制
发表时间：
2019
影响因子：
6.5
通讯作者：
Wan Xiaochun
中科院分区：
文献类型：
--
作者：
Zhang Xianchen;Wu Honghong;Chen Linmu;Wang Ningning;Wei Chaoling;Wan Xiaochun
茶树是一种重要的经济作物，易受干旱影响。培育耐旱性强的茶树品种，需要对茶树的耐旱机制有深入的了解。以往的研究表明，叶肉细胞维持K+的能力与其逆境耐性有关。本研究以12个茶树品种为材料，研究了叶肉K+保持能力在茶树抗旱性中的作用。12个茶树品种叶片细胞K+流出与抗旱性呈极显著负相关(R2= 0.8239，P<； 0.001)。与此相一致的是，耐旱性茶树品种的叶片残留K+含量显著高于敏感茶树品种。此外，外源K+(5 mM)显著缓解了茶树的干旱诱导症状，进一步支持了我们的发现，即叶肉K+留存是茶树耐旱机制的重要组成部分。此外，药理实验还表明，K+外向整流通道和非选择性阳离子通道对抗旱性和敏感型茶树品种叶肉细胞K+外流的调控作用不同。
Tea plant is an important economic crop and is vulnerable to drought. A good understanding of tea drought tolerance mechanisms is required for breeding robust drought tolerant tea varieties. Previous studies showed mesophyll cells’ ability to maintain K+is associated with its stress tolerance. Here, in this study, 12 tea varieties were used to investigate the role of mesophyll K+retention ability towards tea drought stress tolerance. A strong and negative correlation (R2= 0.8239,P< 0.001) was found between PEG (mimic drought stress)-induced K+efflux from tea mesophyll cells and overall drought tolerance in 12 tea varieties. In agreement with this, a significantly higher retained leaf K+content was found in drought tolerant than the sensitive tea varieties. Furthermore, exogenous applied K+(5 mM) significantly alleviated drought-induced symptom in tea plants, further supporting our finding that mesophyll K+retention is an important component for drought tolerance mechanisms in tea plants. Moreover, pharmacological experiments showed that the contribution of K+outward rectifying channels and non-selective cation channels in controlling PEG-induced K+efflux from mesophylls cells are varied between drought tolerant and sensitive tea varieties.