木荷种子萌发及对干旱胁迫的响应

Schma superbe Seedling Sprouting and Its Response to the Drought Intimidation

以不同渗透势的PEG(6000)溶液模拟干旱胁迫条件,研究木荷种子的萌发、幼苗生长和累积吸水率对干旱胁迫的响应。结果显示:木荷种子的萌发率、幼苗生长及累积吸水率与PEG溶液的渗透势之间呈显著的负相关关系,但渗透势为-0.3^-0.6 MPa时,种子的萌发率比对照要高一些。在渗透势达到-1.8 MPa时,仍有少量种子(5.2%)能萌发,说明木荷种子具有一定的抗干旱胁迫能力。另外,经PEG处理后复水,种子的萌发率均高于对照的32.4%,提示PEG处理可以打破木荷种子的休眠现象。

The results showed that the evident negative correlations between Schma superbe sprouting rate, seedling growth and accumulation rate of absorbing water, and PEG solution osmotic potential, but when the osmotic potential was -0.3 ～ -0.6Mpa, the sprouting rate of seedling was higher than that of the control.When the osmotic potential reached-1.8 MPa, a small number seeds （5.2% ） could still sprout, which demonstrated that S. superbe seed possessed a certain ability of resisting drought intimidation. In addition, through the water addition after PEG treatment, the sprouting rate of seed was 32.4 % higher than that of the control, which hinted that PEG treatment might break the dormancy phenomenon.