砷对烤烟叶片水分代谢的影响

Effects of arsenic toxicity on water metabolism in leaves of flue-cured tobacco (Nicotiana tabacum L.)

为了探讨砷毒害与烤烟水分代谢的关系,采用盆栽试验研究了砷对烤烟叶片水分代谢的影响。结果表明,砷使烤烟叶片的水势、蒸腾速率、气孔导度、自由水含量和单叶水分利用效率降低,但使叶片含水量、束缚水含量、束缚水和自由水比值提高。土壤中砷含量越高,砷对烤烟叶片水分代谢的影响程度越大。砷对烤烟生育前期叶片水分代谢的影响大于中、后期。说明砷严重影响了烤烟的水分代谢,降低了水分在生理代谢方面的功能。

A systematic study was conducted on effects of arsenic toxicity on water metabolism in leaves of flue-cured tobacco. The results showed that arsenic toxicity decreased water potential, transpiration rate,stoma conductance,free water content and water use efficiency in leaves of flue-cured tobacco,but it increased water content, bond water content and ratio of bond water and free water. The higher content of arsenic in soil, the greater impact it had on the water metabolism. Besides, the effect of arsenic toxicity on water metabolism in leaves of flue-cured tobacco during the early growing stage was more significant than that during the middle and last growing stages.