Yield Formation and Physiological Response of Hybrid Rice Under Different Salt Concentrations
Salt stress is one of the important factors that affect rice yield.In order to investigate the effects of salt stress on the accumulation and transport of dry matter and the yield formation of hybrid rice,two salt-tolerant rice varieties(Xiangliangyou 900 and Jingliangyou 534)and one salt-sensitive rice variety(Longliangyou 8612)were used as the materials,and three treatments of salt concentration at 0.0％(CK),0.3％and 0.6％,mixed with natural seawater and fresh water,were set.The results showed that the yield and yield components of rice varieties decreased significantly with the increase of salt concentration,and the yield of salt-tolerant rice was higher under the same salt concentration.At 0.3％salt concentration,Longliangyou 8612,Xiangliangyou 900 and Jingliangyou 534 yielded 75.0％,56.6％and 43.8％less than CK,respectively.At 0.6％salt concentration,Longliangyou 8612,Xiangliangyou 900 and Jingliangyou 534 yielded 92.0％,77.8％and 72.9％less than CK,respectively.In addition,compared with the salt-sensitive variety,the salt-tolerant varieties maintained the ion balance by keeping a higher K+/Na+ratio,and had a higher crop growth rate and transport rate of stem and leaf,and a higher vascular bundle area of the panicle neck intemode.In conclusion,the physiological performance and the vascular bundle system of panicle neck of the salt-tolerant varieties are better than those of the salt-sensitive variety at 0.3％and 0.6％salt concentrations,which is conducive to dry matter accumulation and transport,and increases the yield of rice.
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