PEG模拟干旱胁迫对亚麻种子萌发及幼苗生长的影响

采用不同PEG浓度模拟干旱条件,对亚麻品种陇亚8号种子萌发及幼苗进行胁迫。结果表明,在较低PEG浓度下（20%）,亚麻种子萌发率、幼苗茎叶鲜重、主根长度、幼苗色素浓度显著下降,叶片MDA积累量显著升高,侧根数目增多,叶片内可溶性糖含量增加;随着PEG浓度增加,亚麻种子萌发率、幼苗茎叶鲜重下降趋缓,叶片MDA积累量上升趋缓,主根长度、色素浓度下降,侧根明显增多,叶片可溶性糖含量提高。

Effects of PEG-simulated Drought Stress on Seed Germination and Seedling Growth of Linum usitatissium L.

Three PEG-6000 concentrations （20%,25% and 30%）simulated drought stress were used in this study to test its influence on the seed germination and seedling growth characters of Linum usitatissium L. （ Longya-8）. The results showed that the seed germination rate declined rapidly at the 20% PEG concentration,and as well as the seedling total weight of stems and leaves, taproot length and the pigment concentrations,and the MDA concentration increased rapidly,indicating a serious adverse effect of drought stress at 20% PEG concentration to Linum usitatissium L. seed germination and seedling growth. Along with the rising PEG concentration,the lateral root numbers and the soluble sugar contents increased. The results indicated that Linum usitatissium L. may enhance its drought resisting ability by increasing the lateral root numbers and leaf soluble sugar contents at drought stress.