干旱胁迫对剑麻幼苗生理生化的影响

摘要

Pot cultivation experiment was used to evaluate the effects of drought stress on the physiology and biochemistry of sisal seedlings. In this study, sisal seedlings were exposed to drought stress (without irrigation)for 90 days. And the measurement was determined every 15 days, including leaf relative water content ( RWC ), relative electric conductivity ( REC ), malondialdehyde ( MDA), peroxidase (POD) , proline(Pro) and root activity(TTC). The results indicated that RWC decreased by the biggest rate of 8. 64% with the increasing of the stress time. However REC, MDA and Pro increased evidently, and the corresponding biggest increased rates of REC and MDA and Pro were 86.22% , 80% , 41.54% , respectively. Meanwhile, POD and TTC activities increased at the beginning and then declined continually in the later. The highest values of the POD and TTC activities were 1326. 33u/g. Fw and 2. 66g/g. h respectively.%以剑麻(H· 11648)幼苗为材料,采用盆栽试验的方法,研究了剑麻对干旱胁迫的生理响应.试验对剑麻幼苗进行干旱胁迫处理,每隔15d测定叶片相对含水量(RWC)、相对电导率( REC)、丙二醛(MDA)、过氧化物酶(POD)、脯氨酸(Pro)和根系活力(TTC)的变化,共处理90d.结果表明,随着干旱胁迫时间的增加,叶片含水量有所下降,下降最大幅度为8.64％,而相对电导率、丙二醛含量和脯氨酸含量却明显上升,最大增幅分别为86.22％,80％和41.54％,过氧化物酶活性和根系活力则呈现先上升后下降的趋势,峰值分别为1326.33u/g.Fw和2.66g/g.h.