Cluster Analysis of Maize Landraces Based on Karyotype Parameters
YAO Qilun
CHEN Fabo
HE Zhangshuai
FANG Ping
Abstract：Fourty maize landraces collected from Southwest China were used as materials,and their mainly karyotype parameters were identified using cytological technology,subsequently,cluster analysis of those maize landraces were conducted by the longest distance method.The results indicated that B chromosomes(Bs) existed in 17 maize landraces,and the total chromosome length,the longest chromosome length,the smallest chromosome length,the ratio of chromosome length,the mean centromere index,the mean arm ratio,as well as the index of karyotypic asymmetry of fourty maize landraces were on an average of 89.56 μm,5.84 μm,2.64 μm,2.46,35.62%,1.48 and 59.06%,respectively,and the corresponding amplitude variations were 61.51-103.82 μm,3.62-7.50 μm,0.98-4.33 μm,1.41-5.21,26.93%-40.33%,1.05-2.43 and 51.20%-70.90%,respectively.In addition,the mean genetic distance among those maize landraces was on average of 10.05,ranging from 3.09 to 46.57.Based on these seven karyotype parameters,40 maize landraces could distinctively be clustered into six groups under the genetic distance of 15.98,group Ⅰ,Ⅱ,Ⅲ,Ⅳ,Ⅴ and Ⅵ were consisted of 3,9,4,14,8 and 2 maize landraces,respectively.Great karyotype difference was found in 40 maize landraces,suggesting that abundant genetic variance existed in maize landraces at cytological level in Southwest China.
Keywords：maize landraceskaryotypecluster analysis
Publication Date：2017-06-02
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 34-38 )