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对北方不同熟期类型的14个水稻品种进行耐苏打盐碱胁迫鉴定,了解水稻生长发育对苏打盐碱胁迫的阈值反应。结果表明,pH>9.6时,水稻存活率开始下降;在pH7.5~9.6范围内,水稻虽然能够正常抽穗结实,但随着盐碱胁迫强度的增加,各农艺性状都受到不同程度的影响。将各形态指标受抑制率50%时的pH值作为耐苏打盐碱形态阈值,叶面积指数、产量、单株茎蘖数要先于存活率、株高发生阈值反应,说明用形态指标的变化来确定水稻的耐盐碱性存在不确定性。将产量抑制率为50%时的pH值定义为该品种的耐盐碱pH产量阈值,水稻品种(系)耐盐碱pH阈值介于8.9~9.6之间。
14 rice cultivars with different maturity dates in northern China were evaluated for resistance to soda-saline-alkali stress to understand the threshold response of rice growth and development to soda-saline-alkali stress. The results showed that when pH> 9.6, the survival rate of rice began to decline. While in the range of pH7.5 ~ 9.6, although the heading and fruiting of rice were normal, the agronomic traits were affected to varying degrees with the increase of salinity-alkali stress. The pH values at 50% inhibition rate of each morphological index were used as the threshold value of the resistance to soda-caustic soda, the leaf area index, the yield and the number of tillers per plant before the threshold rate of survival and plant height. To determine the salt tolerance of rice is uncertain. The pH value when the yield suppression rate was 50% was defined as the salt tolerance and pH-yield threshold of this variety. The salt-tolerance pH threshold of rice varieties (lines) ranged from 8.9 to 9.6.