指繁殖材料的生理衰老导致再生作用降低，不定根发生能力减退的现象。
无性繁殖在林业中应用很普遍，而由树木发育阶段转变带来的成熟效应问题，一直是无性系造林的障碍。
Vegetative propagation is widely used in forestry, however, the maturation that due to phase changes during tree development is a huge obstacle.
现在，一组研究人员已经发现一种新的机制，这个机制决定了可能由胸腺产生的一个成熟T细胞是否作为一个效应细胞或者一个调节细胞。
Now, a team of researchers has discovered a novel mechanism determining whether a maturing t cell is likely to emerge from the thymus as an effector cell or a regulatory cell.
本试验用含有EMS的石蜡油溶液处理10个玉米材料的成熟花粉，研究了EMS对花粉离体萌发率、M1代生理损伤以及M2代的诱变效应。
The mature pollens of 10 maize varieties (lines) were treated with EMS. The induction effects on the germinating rates, the physiological damage of M1 and M2 were studied.
应用推荐