Differences in Response to Salt Stress of Rice Varieties with Different Salt Tolerance
To investigate the yield response of different salt-tolerant rice varieties to salt stress,three salt-tolerant rice varieties and three salt-sensitive rice varieties were used as test materials.Through two seasons of field experiment,the differences in growth,development and yield traits of rice varieties with different salt-tolerant ability were studied under three salt stress treatments(0.0％,0.3％and 0.6％).The results showed that the yield reduction rates of salt-tolerant rice varieties under 0.3％and 0.6％salt stress were 38.1％～50.6％and 51.2％～63.6％,respectively,which were significantly lower than those of salt-sensitive rice varieties(47.9％～72.3％and 72.9％～84.6％).At the same time,the decrease of plant height,number of tillers and above-ground dry matter of salt-tolerant rice varieties was significantly lower than that of salt-sensitive rice varieties at the full tillering stage and full heading stage.Further analysis showed that compared with salt-sensitive varieties,salt-tolerant varieties had higher yield under 0.6％salt concentration stress,and the leaves still maintained higher SPAD value at full heading stage,and lower Na+content and sodium potassium ratio at maturity stage.Therefore,good agronomic traits and physiological indexes are the basis for rice to achieve high yield under salt stress.
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