杂种优势固定与早世代稳定现象  

Heterosis Fixation and Early Generation Stability

作　　者：李伯军 

机构地区：[1]雅安中学,四川雅安625000

出　　处：《内江师范学院学报》2007年第4期78-82,共5页Journal of Neijiang Normal University

摘　　要：杂种优势固定可通过无融合生殖、半配合生殖、染色体变异和组织培养等方法实现.在育种实践中,发现了杂种优势在F3代及以前不分离的现象,即早世代稳定,其遗传学机制包括有丝分裂重组机制、体细胞染色体消除机制、有丝分裂染色体分组机制和DNA片段杂交.研究发现,早世代稳定现象发生时存在一些共同的特征.Heterosis should be achieved by apomixes, semigamy, chromosome mutation, etc. In the breeding practice, the special phenomenon appeared in crop crosses that some lines （or panicles） of cross progeny did not segregated before F3, which is called early generational stability. The genetic mechanism had report includes meiosis recombination, chromosome elimination, and somatic segregation, DNA crosses, etc. Some common specialty had been obtained in early generation stability studies.

关 键 词：植物育种 杂交优势固定 早世代稳定 

分 类 号：S33[农业科学—作物遗传育种]