Abstract:

The effects of various salt stresses on the plant growth and photosynthetic characteristics of wild rice were studied. The result showed that the low concentration of neutral salt accelerated the growth of wild rice to a certain extent, while basic salt restrained the growth of wild rice; the high concentration of salt stress seriously restrained the growth of wild rice. The effect of basic salt stress was stronger than neutral salt stress. It showed strong negative correlation between plant height, root length, root number, root-shoot ratio, net photosynthetic rate, stomatal conductance, transpiration rate, limitation of stomatal for wild rice and two salt stress degree. The intercellular CO2 concentration was very significant positive correlated with the salt stress degree. The wild rice were still retain a certain amount of the growth and biological accumulation, and showed more adaptable to salt stress.

Key words: wild rice, salt stress, growth, photosynthetic characteristics

摘要：

研究了不同盐胁迫强度对野生稻植株生长发育及光合特性的影响。结果表明，低浓度的中性盐对野生稻生长具有一定的促进作用，低浓度的碱性盐抑制野生稻生长；高浓度盐胁迫严重抑制野生稻生长；碱性盐胁迫对野生稻的抑制作用强于中性盐胁迫。野生稻株高、根长、根数、根冠比、净光合速率、气孔导度、蒸腾速率、气孔限制值与两种类型盐胁迫程度均呈极显著负相关；胞间CO2浓度与两种类型盐胁迫程度均呈极显著正相关。在盐胁迫下，野生稻品种仍能保持一定的生长量和生物量积累，对盐胁迫表现为更强的适应性。

关键词: 野生稻, 盐胁迫, 生长, 光合特性