摘要
对 2个八倍体 C.S- Thinopyrum bessarabicum( AABBDDJJ,2 n=8x=56)和 Goshawk( GHK) - Thinopyrum elongatum( AABBDDEE,2 n=8x=56)的根尖细胞染色体进行 C-分带 ,从中分检出 Th.bessarabicum和 Th.elongatum的各自染色体进行核型分析 ,结果表明 :Th.bessarabicum和 Th.elongatum的大多数染色体都具有端带 ,但 Th.bessarabicum的端带更强 ,很少有中间带 ;而 Th.elongatum的染色体除 E1外其它染色体的端带较弱 ,而且带纹较丰富 ,有较多的中间带。对 C.S- Th.bessarabicum和 GHK- Th.elongatum进行有性杂交 ,其杂交种F1的 PMC染色体在 MI的平均配对构型为 1 5.50 + 5.0 3 [+ 1 4.2 0 ○ + 0 .40 + 0 .2 1 ,其中 Th.bessarabicum和 Th.elongatum染色体平均配对成 2 .5个二价体 ,由 C-分带显示大多数 Th.bessarabicum和 Th.elongatum染色体呈单价体状态。因此推断 ,Th.bessarabicum和 Th.
Chromosomes of two octoploids C.S Thinopyrum bessarabicum (AABBDDJJ,2n=8x=56) and GHK Thinopyrum elongatum (AABBDDEE,2n=8x=56) were C banded and karyotypes were analyzed with metaphase chromosomes,respectively.The results showed that terminal C banding were observed in both chromosomes of Th.bessarabicum and Th. elongatum ,but the J genome of Th.bessarabicum had prominent terminal C bands,which not present in that of Th.elongatum except chromosome E 1.On the other hand,the chromosomes of Th.elongatum showed several interstitial C bands,while Th.bessarabicum did not.The chromosome pairing in octoploid hybrid between C.S Th.bessarabicum and GHK Th.elongatum was analyzed and octoploid hybrid showed a mean pairing of 15 50Ⅰ+5 03 Ⅱ[ + 14 20 Ⅱ○ +0 40Ⅲ+0 21Ⅴ with 2 5 bivalents paired by chromosomes of Th.bessarabicum and Th. elongatum .Based on C banding patterns,most chromosomes of Th.bessarabicum and Th. elongatum showed univalents.Therefore,it can be concluded that they have no very close relationship and should have different genomes.
出处
《武汉植物学研究》
CSCD
2000年第4期261-265,T001,共6页
Journal of Wuhan Botanical Research
基金
麦氏基金
关键词
普通小麦
C-分带
类麦属
基因组
关系
Triticum aestivum
Thinopyrum bessarabicum
Thinopyrum elongatum
C banding
