评价加速老化杉木种子活力生理生化指标的研究

THE EVALUATLON OF PHYSIOLOGICAL AND BIOCHEMICAL VIGOUR INDICES BY TESTING CHINESE FIR SEEDS ACCELERATIVELY AGED FOR DIFFERENT PERIODS

本文分析了14份不同活力的杉木种子样品的发芽率、发芽指数、活力指数、简化活力指数、电导率、氧气吸收速率。结果认为发芽率只反映死亡种子数,而对发芽的种子一视同仁。发芽指数是杉木种子最好的活力指标,其次是活力指数。发芽指数将发芽的种子分成n个等级,n为发芽记录次数。简化活力指数实质上只是百粒种子长出幼苗的总长度。电导率和氧气吸收速率只在一定程度上反映杉木种子活力相对水平,但不是理想的活力指标。

This paper tested vigour of 14 seed lots collected from three families in Chinese fir orchard, acceleratively aged in temperature of 40℃ and relative humidity of nearly 100% for 1-5 days, with conductivity, respiration, germination index, vigour index, simplified vigour index. It was found that germination index was the best vigour test for Chinese fir seeds because it not only indicated the number of germinated seeds, but also classified the germinated seeds into n classes, in which n is the number of days of germination period. Vigour index also could express the change of deteriorating seed vigour accurately. Simplified vigour index was proved to be the total length of seedlings germinated by 100 seeds. Conductivity and respiration could in some certains present the differences among seed lots, but were not good vigour tests for Chinese fir seeds.