耐盐水稻种质资源的筛选

Selection on Rice Germplasm Tolerant to Salt Stress

用 0 8 %NaCl溶液和国际水稻所水稻耐盐性 9级评价方法对前人选留的 38份水稻耐盐种质资源 (用 0 5 %NaCl盐土筛选 )进行了重复筛选 ,以期获得极端耐盐水稻种质资源。同时研究了不同盐浓度对水稻发芽率的影响。结果表明 :高浓度盐溶液显著抑制水稻种子的发芽率 ,但品种间有较大差异 ;筛选出苗期极端耐盐品种 6份 ,其中 1级 1份 ,2级 4份 ,3级 1份 ;极端耐盐水稻品种苗高的增长受高浓度盐溶液抑制 ,但品种间差异不显著 ;而盐溶液对极端耐盐水稻品种出叶速率的影响因品种而异。

Thirty-eight rice varieties identified to be tolerant to salt stress previously were identified repeatedly with the 9-level identification methods of International Rice Research Institute using 0.8% instead of 0.5% NaCl solution in order to obtain extremely salt-tolerant rice varieties. Meanwhile, the effects of salt concentration on sprout rates of these varieties were studied. The results showed that high-concentration salt solution restrained significantly sprout rates of these varieties. six rice varieties were identified to be extremely resistant to salt, of which, one variety ranked first-level tolerance, four varieties second-level tolerance and one variety third-level tolerance. Increase of seedling height were limited by high-concentration salt solution, but difference between varieties extremely resistant to salt was not significant. The effects of salt solution on growth rate of rice leaves were different depending on varieties extremely resistant to salt.