Chinese Journal OF Rice Science >
Performance of Yield, Photosynthesis and Grain Quality of japonicaRice Cultivars UnderSalinity Stress in Micro-plots
Received date: 2017-06-09
Online published: 2018-03-10
【Objective】Rice growing is one of the widely utilized technologies for desalting, improving and exploiting tidal flat in Jiangsu coastal beach. The objective is to revealthe effects of salinity stress on rice yield,photosynthetic parameters, grain quality and starch viscosity, providing a reference and laying a theoretical basis for developing rice production in Jiangsu coastal beach.【Method】Four japonica rice varieties with better salt tolerance, Tongjing 981, Yandao 12, Yandao 10 and Nanjing 5055 were used to investigate theyield and its components, photosynthetic parameters, rice quality and starch viscosity under salinity stress (S1, 1.112 dS/m for EC1:5) and no salinity stress (S0, 0.207 dS/m, control).【Result】Compared with the control, rice yield decreased significantly under salinity stress, was only 40.5% of that of the control, panicle number per unit area had no significant difference, while grain number per panicle and 1000-grain weight also decreased significantly. The photosynthetic rate and intercellular CO2 concentration decreased significantly, but stomatal induction and transpiration rate had no significant difference between S0 and S1. The processing quality of rice, together with amylose content decreased significantly, the appearance quality almost remained unchanged, while protein content increased significantly. The peak viscosity, trough viscosity, final viscosity, breakdown value, consistence value showed no significant changes, the setback value and pasting temperature increased significantly.【Conclusion】Salinity stress had adverse effects on yield, photosynthetic parameters and grain quality of rice.During the critical period of salt stress on yield and quality, such as booting stage and filling stage, measures should be taken to alleviate salt stress.
Genyou ZHOU, Caijiao ZHAI, Xianliang DENG, Jiao ZHANG, Zhenliang ZHANG, Qigeng DAI, Shiyou CUI . Performance of Yield, Photosynthesis and Grain Quality of japonicaRice Cultivars UnderSalinity Stress in Micro-plots[J]. Chinese Journal OF Rice Science, 2018 , 1(1) : 146 -154 . DOI: 10.16819/j.1001-7216.2018.7068
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