盐渍地刺槐体内Na的积累和分布

Accumulation and distribution of Na in Robinia pseudoacacia in saline-alkali soil

研究了Na在不同树龄刺槐(Robiniapseudoacacia)地下部分和地上部分的分布,以及刺槐地下部分Na含量与对应土层Na含量的关系。在长时间盐胁迫下,大量Na盐进入刺槐体内,随着生长时间的增加,Na盐积累量骤然增加。刺槐地下部分Na的绝对含量和积累速率显著高于地上部分。随着根系不断向土层深处伸延,刺槐根部Na含量显著增加。本研究揭示了在高盐环境中,刺槐通过调节Na在植物体内的分配,以减少Na+的生理毒害,提高其对高盐胁迫的耐受性。

A research was carried out on distribution of Na in Robinia pseudoacacia of various plant-age,and revealed the relationship of Na content in the roots with that in the corresponding soil layers.Under long-term salt stress,the plant accumulated a mass amount of Na, and the accumulation increased drastically with the time going on.The absolute Na content as well as the Na accumulation rate of the roots were evidently higher than that of the aerial parts,and the Na content in the roots observably increased with the roots extending deeper into the soil layer.Combination of all the results reveals that under excessive salt stress,Robinia pseudoacacia avoided physiological harm of Na and enhanced its tolerance towards excessive salt stress.