摘要
Giemsa 显带表明,小麦 ph_b(ph 基因突变系)×春黑麦杂种 F_1减数分裂所形成的二价体,包括三种类型的配对结构;(1)小麦染色体组内部分同源染色体配对约占72%;(2)黑麦染色体组内异源配对约占2%;(3)小麦染色体与黑麦染色体属间非同源配对,约占26%.三种配对类型的形成不是随机的,联会频率的大小以及联会紧密程度取决于染色体结构和遗传功能相似程度。根据显带证明,确有属间异型二价体存在,这便表明非同源染色体的异染色质,在ph 基因的作用下,是能发生联会的。
Using chromosome Giemsa banding techniques,the non-homologous bivalents in hybrids of Ph_(1b)(wheat ph gene mutant) with rye can be classified into three types:(1)homoeolgous pairing within genomes of wheat,(2)allosy- napsis within genome of rye,and (3) intergeneric pairing between wheat chro- mosomes and rye chromosomes.These three types of bivalents didn't emerge at random.The frequency and number of chiasmata of each type depend on the degree of the similarity of chromosomal structures and genetical functions between pairing chromosomes.It was verified by Giemsa banding that hetero- morphic intergeneric bivalents certainly existed,which indicates that hetero- chromatins of non-homologous chromosomes can form synapsis by the function of ph gene.
基金
农业部生-02-01-10项目
关键词
小麦
黑麦
属间杂种
非同源二价体
Triticum aestivum
intergeneric hybrids
non-homologous bivalent
Giemsa banding
