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采用等位酶技术 ,对北疆苜蓿属植物种群的繁育系统进行了研究。结果表明 ,北疆苜蓿属植物种群为外繁育系统 ,黄花苜蓿、多变苜蓿、紫花苜蓿基因组成中杂合体过多 ,均保持较低的自交结实率。参试苜蓿属植物表现某种程度的内繁育衰退现象 ,地理或生殖隔离等因素可能是导致个别种群出现内繁育衰退现象的原因之一。对北疆苜蓿属遗传资源保护时 ,既要选择遗传基础丰富的种和种群以保持最多的遗传变异 ,还要注意选择具有不同等位基因的种群以保持原有的基因和基因频率。
Allozyme technology was used to study the breeding system of alfalfa population in northern China. The results showed that the population of alfalfa in northern Xinjiang was an external breeding system. There were too many heterozygotes in Medicago falcata, alfalfa alfalfa and alfalfa, all of which maintained low self-fertility. Some factors such as the decline of inbreeding and the geographical or reproductive isolation of alfalfa may be one of the reasons leading to the decline of breeding in individual populations. In the protection of Medicago sativa genetic resources in northern Xinjiang, we should choose the genetically rich species and population in order to maintain the most genetic variation, but also pay attention to the selection of populations with different alleles to maintain the original gene and gene frequency.