关键词: 豆科牧草, 形态学标记, 育种, 南方热区

Abstract: The demand for high quality forage species is increasing in the southern tropical regions of China,and comprehensive evaluation of the morphological characteristics among the existing accessions is a prerequisite for the excellent variety selection. 32 botanical characters of 76 Desmodium Des. accessions from 9 species were observed,and the morphological genetic diversity was studied. The results showed that:Among the 32 botanical characters,the coefficient of variation of pod shape and hair type of stems were relative higher,which was 60.72% and 50.45%,respectively,indicating rich genetic diversity in Desmodium Des. accessions; Cluster analysis showed that,76 germplasm can be divided into 7 categories at the Euclidean distance of 17,Desmodium heterocarpon var. strigosum Vaniot Meeuwen ‘071221227’,Desmodium cinereum ‘CIAT46561’,Desmodium heterocarpon ‘061002029’,Desmodium heterocarpon ‘081229011’,Desmodium heterocarpon ‘071221025’,Desmodium heterocarpon ‘070302002’,Desmodium ovalifolium ‘CIAT350’,Desmodium heterocarpon ‘041104057’ and Desmodium heterocarpon ‘070117039’ in the first category had larger leaf in pod shapes,wider central leaflets and few hairs,these accessions potentially have high yield and high quality,should be the candidate accessions for breeding. Through this study,characteristics of inter-specific morphological genetic diversity among Desmodium Des. were clarified,which laid the foundation for the breeding of Desmodium Des.

Key words: Leguminous forage, Morphological marker, Breeding, South tropics