萝卜种子萌发的逆温耐性诱导研究

以萝卜种子为试材，研究不同温度预处理对萌发期萝卜种子逆温耐性的影响。结果表明:萝卜种子在低于15℃和高于35℃下萌发，种子活力显著下降，而通过适度的温度胁迫处理，可提高萝卜种子在高温（35℃）下的萌发活力。15℃和25℃分别是预处理的适宜低温和高温，6 h是低温（15℃）预处理的适宜时间。萝卜种子经高温（30℃）预处理12 h后，在随后的低温（10℃）下萌发，也提高其种子活力，说明萝卜种子对高温和低温胁迫具有交叉适应性。

The Induction for Adverse Temperature Tolerance During the Germination of Radish Seeds

The changes of adverse temperature tolerance during the germination of radish seeds pretreated by different temperatures were studied. Results showed that the vigor of germination remarkably decreased when the seeds were germinated under the temperatures of higher than 35℃ or lower than 15℃. The mild temperature stress could improve the germination ability of radish seed greatly in high temperature（35℃）. The optimal pretreatment low and high temperature are 15℃ and 25℃ respectively. The optimal pretreatment time is 6 hours（at 15℃）. The pretreatment of high temperature (at 30℃，12 hours) also could improve the seed vigor in low temperature subsequently, which shows that the seeds have cross adaptation for heat and chilling stresses.