玉米种质材料遗传多样性的ISSR分析

[目的]利用ISSR分子标记分析越南北部山区当地玉米种质材料的遗传多样性.[方法]采用ISSR技术和10个引物对从越南和老挝北部山区3个省收集的21份玉米种质材料即12份普通玉米和9份糯玉米的遗传多样性进行分析.[结果]在21份玉米种质材料中可以检测到108个ISSR片段,其多态性为100%.ISSR引物的多态性信息量值为0.10~0.39,每条引物平均为0.24;分辨力为14.29~0.48,平均每条为4.48.除ISSR-TI以外,所有ISSR引物在13份玉米材料中均产生特异性片段.根据聚类分析结果,使用70%的遗传相似性作为切割点,建立了玉米种质材料系统树,21份玉米种质材料被分为3大类.不同玉米材料的相似系数为0.52~0.90.[结论]IssR标记可提供玉米种质遗传多样性信息,对越南玉米种质材料的收集、保护和育种具有重要作用.

Genetic diversity of maize (Zea mays L.) accessions using inter-simple sequence repeat (ISSR) markers

[Objective]The present study was conducted to analyze the characterization of the genetic diversity among local maize accessions in the North mountain region of Vietnam using ISSR markers.[ Method ]The ISSR technique and 10 primers were used to study genetic diversity among 21 maize accessions consisting of 12 normal and 9 waxy maize accessions,collected from 3 provinces in the North mountain region of Vietnam and Laos.[ Result]A total of 108 ISSR fragments were detected and all of them were polymorphic (100%).Polymorphism information content (PIC) values of ISSR primers ranged from 0.10-0.39.The average PIC value for each primer was 0.24.The resolving power (Rp) value ranged from 14.29-0.48 with an average of 4.48 per primer.All of tested ISSR primers with the exception of ISSR-T1 generated unique fragments (present only in one accession) in 13 among 21 maize accessions.Based on UPGMA analysis,using 70% genetic similarity as the cutoff,a dendrogram was constructed and 21 maize accessions were grouped into three clusters.The similarity coefficients among accessions ranged from 0.52-0.90.[Conclusion ]ISSR markers provided information on genetic diversity of maize accessions which was useful for collection,conservation and breeding programs in Vietnam.