Chloride and amino acids are associated with K+-alleviated drought stress in tea (Camellia sinesis)
Xianchen Zhang
A , Honghong Wu B C , Jingguang Chen D , Linmu Chen A and Xiaochun Wan A E
+ Author Affiliations
- Author Affiliations
A State Key Laboratory of Tea Plant Biology and Utilisation, Anhui Agricultural University, Hefei, 230036, China.
B College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China.
C College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China.
D CAAS-IRRI Joint Laboratory for Genomics-Assisted Germplasm Enhancement, Agricultural Genomics Institute in Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China.
E Corresponding author. Email: wanxiaochun360@163.com.
Functional Plant Biology 47(5) 398-408 https://doi.org/10.1071/FP19221
Submitted: 5 August 2019 Accepted: 2 December 2019 Published: 6 March 2020
Abstract
Drought is one of the main limiting factors affecting tea plant yield and quality. Previous studies have reported that K+ (potassium) application significantly alleviated drought-induced damage in tea plants. However, the intrinsic mechanisms underlying K+-alleviated drought stress are still obscure. In our study, two contrasting varieties, Taicha12 (drought tolerant) and Fuyun6 (drought sensitive), were used to investigate the intrinsic mechanisms behind K+-alleviated drought stress in tea plants. In the present study, we compared with the case of tea plants under drought: higher water and chlorophyll contents were found in drought-stressed tea plants with an external K+ supply, confirming the role of externally supplied K+ in mitigating drought stress. We also found that an adequate K+ supply promoted Cl– accumulation in the mesophyll of Taicha12 (drought tolerant) over that of in Fuyun6 (drought sensitive). Moreover, Gly, Cys, Lys and Arg were not detected in Fuyun6 under ‘Drought’ or ‘Drought + K+’ conditions. Results showed that an exogenous supply of Arg and Val significantly alleviated drought-induced damage in Fuyun6, suggesting their role in K+-alleviated drought stress in tea plants. Collectively, our results show that chloride and amino acids are important components associated with K+-alleviated drought stress in tea plants.
Additional keywords: amino acids, Cl–, drought stress, K+ application, tea plants.
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