论文部分内容阅读
观察了用花药培养方法诱导出来的4—5年生20个当代植株体细胞染色体在数量上的变异,其结果如下: 1、杨树花粉植株基本上为混倍体、即在同一植株内不仅存在1—4倍的正倍体细胞,而且也有介于1—2倍体间的非正倍体细胞,其中以二倍体细胞和介于1—2倍体问的非正倍体细胞占多数。而后者的产生可能与多极有丝分裂有关。 2、不同植株中各种正倍体和非正倍体细胞所占比例不同,且直接影响植株的生长势。就中东杨花粉植株来看,生长快的植株中二倍体细胞占多数,生长慢的植株中介于1—2倍体间的非正倍体细胞占多数。 3、在生长过程中,花粉植株体细胞染色体倍数性在变化,有由单倍向二倍体转变即自然加倍的趋势。核内有丝分裂及核触合等有丝分裂的异常过程可能是其重要原因。
The number of somatic chromosomes in 20 contemporary plants from 4 to 5 years old induced by anther culture was observed. The results are as follows: 1. The poplar pollen plants are basically in the form of diploid, that is, not only exist in the same plant 1-4 times the number of cells, but also between 1-2 times the non-diploid cells, of which diploid cells and between 1-2 times the body asked non-diploid cells accounted for the majority of non- . The latter may be related to multipolar mitosis. 2, different plants in a variety of non-diploid and non-diploid cells in different proportions, and directly affect the plant growth potential. In the middle Yang pollen plants, fast growing plants accounted for the majority of diploid cells, slow growing plants in between 1-2 times the body of non-diploid cells accounted for the majority. In the process of growth, pollen plant somatic cell chromosome fold change, there is a tendency to change from haploid to diploid. Anomalous processes such as mitotic and nuclear synapses in the nucleus may be an important cause.