Ghaffari S M, Bidmeshkipoor A
Institute of Biochemistry & Biophysics, University of Tehran, Iran.
Genetica. 2002 Aug;115(3):319-23. doi: 10.1023/a:1020676119886.
Two karyotypic variants were recognized in populations of Acanthophyllum laxiusculum Schiman-Czeika. Variant A had 2N = 30 and variant B showed the presence of 0 to 3 B-chromosomes in addition to 2N = 30 chromosomes. Analysis of chromosome behaviour at meiosis showed that the presence of B-chromosomes increases chiasma frequency in A-chromosomes; this effect was higher for plants with odd numbers of B-chromosomes compared with plants with even numbers of B-chromosomes. Comparisons of variants A and B, suggests that B-chromosomes have an effect pollen stainability and seed production. It seems that the presence of B-chromosomes may increase pollen stainability and seed production in variant B.
在疏花刺叶属植物种群中识别出两种核型变异体。变异体A的2N = 30，变异体B除了2N = 30条染色体外，还显示有0至3条B染色体。减数分裂时染色体行为分析表明，B染色体的存在会增加A染色体的交叉频率；与具有偶数条B染色体的植株相比，具有奇数条B染色体的植株这种效应更高。变异体A和B的比较表明，B染色体对花粉可染性和种子产量有影响。似乎B染色体的存在可能会增加变异体B中的花粉可染性和种子产量。
