摘要
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。
By means of the method of allozyme electrophoresis, the breeding systems of Medicago populations from Northern Xinjiang were studied. The results indicated that Medicago populations from Northern Xinjiang presented outbreeding system. The excessive heterozygote, less self fruitful rate existed in tested populations of Medicago falcata , M. varia and M. sativa . Concurrently, the inbreeding depression existed in all tested materials, the main reasons may be geological or reproductive isolation. Therefore, when the germplasm of Medicago are collected, not only species or populations with rich genetic basis are needed to keep the maximal genetic variation, but also those with different alleles are needed to keep original genes and gene frequency.
出处
《草业科学》
CAS
CSCD
2001年第3期21-24,共4页
Pratacultural Science
基金
国家自然科学基金!项目 ( 3 9670 4 49)
