摘要
以伊桐2年生实生苗为研究材料,对其进行良好水分处理(100%田间持水量)、干旱处理(50%田间持水量)和0.1 mol/L盐溶液处理,比较伊桐幼苗的形态生长、生物量分配、光合色素含量、抗氧化酶活性及可溶性渗透调节物质等生长特性和生理生化特性对干旱胁迫与盐胁迫的响应差异。结果表明:①土壤干旱胁迫与盐胁迫在一定程度上降低了植株叶片相对含水量,影响了伊桐幼苗的形态生长,减少了其生物量积累,增加了胡萝卜素含量,从而减小了光合叶绿素含量,增加了植株抗氧化系统的活性及渗透调节物质的含量。②伊桐幼苗形态生长及生理生化特性对土壤干旱胁迫和盐胁迫的响应存在一定的差异:伊桐幼苗受盐胁迫的不良影响要大于干旱胁迫,说明伊桐具有一定的抗旱性,但耐盐性却较低。
In this study,the two-years old seedlings of Itoa orientalis were used as experiment materials,the growth,physiological and biochemical traits of seedlings including leaf morphology,plant growth,biomass allocation,photosynthetic pigments,antioxidative enzyme activities and osmotic adjustment substances were investigated under three treatments（well-watered,100 %FC;soil drought stress,50 %FC;salt stress by 0.1 % NaCl solution）.The majorfindings were as follows：（ⅰ）The growth and morphology of Itoa orientalis were affected more or less by soil drought and salt,the leaf relative water content and biomass allocation decreased under this two stresses.For the physiological and biochemical traits,the carotenoid content was improved while the chlorophyll content reduced;moreover,the antioxidative enzyme activities and osmotic adjustment substances increased under drought and salt stress.（ⅱ） There was different between the responses of Itoa orientalis seedlings to soil drought and to salt： the negative effect on growth and physiological traits of salt was more evident than that of drought,indicating Itoa orientalis was more tolerant to drought but more sensitive to salt.
出处
《西南农业学报》
CSCD
北大核心
2011年第3期896-900,共5页
Southwest China Journal of Agricultural Sciences
基金
云南省"省部级重点学科
省高校重点实验室及校实验室共享平台"资助
西南林业大学重点基金资助项目(110909)
关键词
伊桐
干旱胁迫
盐胁迫
形态生长
生理生化
Itoa orientalis
Drought stress
Salt stress
Morphology and growth
Physiology and biochemistry
作者简介
黄晓霞（1980-）。女。四川成都人，博士，讲师，主要从事园林植物栽培生理及繁殖应用方面的教学科研工作，E-mail：huangxx@swfu．edu．cn
为通讯作者，E-mail：xmcheng0103@gmail．com。
