Chinese Journal OF Rice Science >
Responses of Rice Varieties Differing in Salt Tolerance to Salt Stress and Their Physiological Mechanisms
Received date: 2022-10-24
Revised date: 2023-01-05
Online published: 2023-03-10
【Objective】 The purpose of this study is to clarify the response of salt-tolerant and salt-susceptible rice varieties to salt stress and their agronomic and physiological characteristics. 【Method】 Tow salt tolerant rice varieties Lianjian 5 and Yandao 16Z38 and two salt sensitive rice varieties Huajing 5 and Lianjing 17 were grown in pots at salt concentrations of 0 g/kg (control) and 3 g/kg (salt stress) in the soil. 【Result】 Compared with the control, salt stress decreased grain yield of both salt tolerant varieties and salt sensitive varieties, with more reduction in the latter. A higher grain yield for salt tolerant varieties than that for salt sensitive varieties under salt stress was mainly attributed to more total spikelet number and higher seed setting rate. Compared with salt sensitive varieties, salt tolerant rice varieties had higher activities of antioxidant enzymes, such as superoxide dismutase, in leaves at the stages of mid tillering, jointing heading, and mid grain filling, higher contents of organic osmotic regulators such as proline and proline synthase activities in roots, and higher K+/Na+ values at jointing and heading stages. Salt tolerant rice varieties also showed higher crop growth rates from tillering to jointing and from heading to maturity, higher leaf area index and leaf SPAD value at heading stage, and higher root oxidation activity from heading to mid grain filling stage. 【Conclusion】 More total spikelet number, stronger antioxidant and osmoregulation ability, higher root oxidation activity, and higher K+/Na+ values contributed to a higher grain yield for the salt tolerant varieties under salt stress. Higher superoxide dismutase activity and root oxidation activity could be used as important physiological indexes in breeding and selecting salt tolerant rice varieties.
Key words： rice; salt stress; antioxidation; osmoregulation; root oxidation activity
ZHOU Zhenling, LIN Bing, ZHOU Qun, YANG Bo, LIU Yan, ZHOU Tianyang, WANG Baoxiang, GU Junfei, XU Dayong, YANG Jianchang . Responses of Rice Varieties Differing in Salt Tolerance to Salt Stress and Their Physiological Mechanisms[J]. Chinese Journal OF Rice Science, 2023 , 37(2) : 153 -165 . DOI: 10.16819/j.1001-7216.2023.221005
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