干旱胁迫对锦灯笼种子萌发及幼苗生理特性的影响

以锦灯笼种子为试材,用3%、5%、8%和10%4个浓度的PEG-6000溶液模拟不同的干旱胁迫条件,研究锦灯笼种子萌发情况和幼苗生理特性,以期了解其抗旱性。结果表明:1)随着PEG-6000浓度的加大,锦灯笼种子的发芽率和发芽势先增加后减少,浓度为5%时最大,株高也是在胁迫浓度为5%时达到最高,这说明一定程度的干旱胁迫可以促进种子萌发及幼苗生长。2)丙二醛含量、可溶性糖含量和电导率随着PEG-6000浓度的增加表现为持续上升的趋势,过氧化物酶(POD)活性则呈现先上升后降低的趋势。

Effects of Drought Stress on the Seed Germination and Physiological Characteristics of the Seedling of Physalis alkengi L.

The seeds of Physalis alkengi L.were used as test materials,seeds germination and physiological characteristics of seedling were studied under drought condition which simulated by different concentrations of polyethylene alcohol(PEG-6000,3%,5%,8%and 10%).The results showed that the seed germination rate and germination potential of Physalis alkengi L.first increased and then gradually decreased as the PEG-6000 concentration increased,and up to maximum at 5%.Also plant height was maximum at 5%of PEG-6000.This indicated that a certain degree of drought stress could promote seed germination and seedling growth.The results of physiological indicators were showed that malondialdehyde content,soluble sugar content and electrical conductivity were continuous upward trend with the increasing of PEG-6000 concentration.Peroxidase activity showed a tendency of increasing first and then decreasing.