一、种子劣变的发生和表现 (一)种子劣变和老化的概念 种子发育到了生理成熟期,种子活力达到最高水平。其后以及在贮藏过程中便经历活力下降的一系列不可逆变化,这些不可逆的综合效应称为劣变或老化。 (二)劣变种子的表现 1、萌发不良 劣变种子萌发缓慢,发芽率低,遇到过高、过低温度等不适合的条件时,就极难萌发,即使出苗,也是异形苗多,并容易遭受气候、病虫危害,生长势很差。 First, the occurrence of seed deterioration and performance (A) the concept of seed deterioration and aging Seed development to physiological maturity, seed vitality reached the highest level. Then, and during storage, undergo a series of irreversible changes in vitality decline, these irreversible combined effects known as deterioration or aging. (B) the performance of bad seeds 1, poor germination Bad seeds germinate slowly, the germination rate is low, encountered too high, too low temperature and other unsuitable conditions, it is extremely difficult to germinate, even sprouting, but also shaped Abundant, And vulnerable to climate, pest damage, poor growth potential.