【摘要】 用Hoagland溶液培养玉米幼苗,研究分根交替渗透胁迫对其叶片水势、可溶性糖、NH4+和游离氨基酸的影响。实验表明,当玉米根系一半处于高水势,另一半处于低水势溶液时,在24h间隔交替过程中,叶片的可溶性糖、NH4+和游离氨基酸的含量都比同浓度聚乙二醇(PEG)不分根胁迫下的处理低,但叶水势则相反。说明分根交替渗透胁迫能够发挥根系吸水的补偿效应,提高叶水势。更多还原

【Abstract】 The experiment was coducted to discover the change of water potential, soluble sugar, NH₄⁺, and amino acids in leaves of maize seedlings under alternative split-root osmotic stress. The results showed that when half roots were put into high water potential solution and another half into low water potential solution, and alternated them every 24 hours, the contents of soluble sugar, NH₄⁺ and amino acids in the leaves were lower than that under non-split-root stress with 　the same concentration; the change of leaf water potential was reverse. This proved that alternative split-root osmotic stress had a compensation effect on roots, thus it improved water use efficiency.更多还原