以95份玉米核心自交系组成的关联作图群体为试验材料，进行耐旱相关候选基因dhn2(编码脱水素蛋白)的序列多样性和连锁不平衡结构分析，挖掘不同种质资源中的等位变异。在考虑群体结构影响的基础上，进行dhn2基因多样性与耐旱相关表型之间的关联分析。结果表明：该基因编码区序列多样性较高，但LD水平较低，并检测出7个多态性位点与表型性状显著关联。

A maize association mapping population including 95 maize inbred lines was used for evaluating sequence diversity and linkage disequilibrium of dhn2, a candidate gene encoding dehydrin protein for drought tolerance in the study. Phenotypes related to drought tolerance were also characterized. A number of alleles of dhn2 were discovered. Association analysis of dhn2 polymorphism and drought tolerance related phenotypes showed that the encoding regions of the gene had high nucleotide diversity and low level LD. Additionally, seven significant associations between polymorphism of dhn2 and some phenotypic traits were identified.