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人工授粉后,效果不好的原因,一般表现为以下5个方面:一是授粉组合不适当造成的。以苹果为例,如果用3倍体品种(细胞核中的染色体数3n=51),如伏花皮、绯之衣,陆奥等的花粉,给2倍体品种(细胞核中的染色体数2n=34)授粉时,由于遗传性不亲和,即使进行人工授粉,也不会受精、座果。二是采花、取粉不当,影响了花粉的生活力而造成的。例如,采花时,从过弱的树上采集了过多的弱花,由于稔性花粉率低,就会影响授粉效果。又如在花药散粉过程中,因为低热降低花粉的生活力,也会
Artificial pollination, the effect is not good, the general performance of the following five aspects: First, pollination caused by improper combination. Take apple as an example. If the diploid species (the number of chromosomes in the nucleus is 2n = 3n = 51), such as diploid species (3n = 51 in the nucleus), such as pollen, 34) pollination, due to genetic incompatibility, even if the artificial pollination, it will not be fertilized, fruit. Second, picking flowers, improper take the powder, affecting the viability of pollen caused. For example, when harvesting flowers, too much weak flowers are collected from the weaker trees and the pollination effect is affected because of the low rate of pollen. Another example is the anther loose powder process, because low fever reduces the viability of pollen, will be