Cytogenetic study of some rapeseed (Brassica napus L.) cultivars and their hybrids

被引：15
|
作者：
Sheidai, M [1 ]
Noormohamadi, Z [1 ]
Mirabdolbaghi-Kashani, N [1 ]
Ahmadi, MR [1 ]
机构：
[1] Shahid Beheshti Univ, Dept Biol, Tehran, Iran
来源：
CARYOLOGIA | 2003年 / 56卷 / 04期
关键词：
chiasma frequency; chromosome pairing; cluster analysis; rapeseed;
D O I：
10.1080/00087114.2003.10589349
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
Meiotic study was performed in 22 Brassica napus cultivars; considering chiasma frequency and distribution as well as chromosome pairing. All cultivars possessed n = 19 chromosome number (4x) and showed a deviant course of prophase-I meiosis with synezetic knot and post pachytene diffuse stage. Chromosome stickiness occurred in most of the cultivars from early prophase to late telophase-II leading to the formation of laggard chromosomes and micronuclei. The cultivars studied differed significantly in chiasma frequency and distribution as well as bivalent formation indicating their genomic differences. Cluster analysis and ordination based on principal components analysis grouped those cultivars showing meiotic similarities. Some,of the cultivars showed the occurrence of unreduced meiocytes and pollen grains.
引用
收藏
页码：387 / 397
页数：11
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