海水胁迫下外源生长素对小麦萌发期幼苗生理特性的影响

以海水处理小麦萌发期幼苗的方式,探讨了不同浓度海水胁迫条件下外源生长素(IAA)对小麦幼苗期生理特性的影响。结果表明:与NaCl盐胁迫不同,低浓度海水处理诱导幼苗根系和胚芽中的可溶性糖、可溶性蛋白及游离脯氨酸的积累,生长素可以调节根系和胚芽中的物质合成和海水胁迫诱导的渗透调节作用。海水胁迫下在根系和胚芽中生长素对小麦萌发期生理代谢物质的影响存在差异,根冠比的变化说明生长素可以在某种程度上提高小麦萌发幼苗对海水胁迫的适应性。

Effects of Exogenous Auxin on Physiological Characteristics of Wheat Seedling During Its Germination under Saline Stresses

The wheat seedlings were cultivated in the mode of simulated saline stresses and the effects of exogenous auxin (IAA) on its physiological adaptation to saline stress during wheat germination were investigated.The results showed: Unlike sodium chloride stress, the soluble sugars and soluble proteins and free prolines in the roots and shoots of wheat seedlings were enhanced by saline treatments with low concentration. IAA could regulate the synthesis of substances and osmosis induced by saline stress in the roots and shoots. The effects of exogenous IAA treatments on physiological metabolism in the roots and shoots of wheat seedlings respectively under saline stress were different. The changes of root/shoot ratio indicated that IAA could strengthen the adaptation of wheat seedlings during its germination to saline stresses in some extent.