青藏高原裸大麦种质资源形态多样性分析

为了解青藏高原裸大麦区种质资源的遗传多样性,提高该地区裸大麦种质资源利用效率,对86份青藏裸大麦种质资源的形态多样性进行鉴定。结果表明:该地区裸大麦种质资源遗传多样性丰富,主穗长的形态多样性指数最高,为2.05;株型的遗传多样性指数最低,为0.47。总体表现为数量性状形态多样性指数大于质量性状。基于形态性状的聚类分析把86份材料聚为4类,第Ⅰ类是二棱种质,为高秆大穗大粒型,第Ⅱ类种质为矮秆多粒长穗型,第Ⅲ类种质为短穗型,第Ⅳ类种质为高秆多粒型。采用主成分分析进行种质评价,提取前7个主成分即可概括全部性状的大部分生物学信息,筛选出适合江苏地区生长的优良种质资源,为裸大麦种质资源的收集和利用提供理论依据。

Morphological diversity of hulless barley accessions from Qinghai-Tibetan Plateau

To study the genetic diversity of hulless barley accessions from Qinghai-Tibetan Plateau and improve their utilization efficiency, the morphological diversity of 86 hulless barley accessions from Qinghai-Tibetan Plateau was identified in this study. The results showed that genetic diversity of hulless barley accessions was ample, morphological diversity index of main panicle length was the highest with the value of 2.05. Plant type had the lowest genetic diversity index with the value of 0.47. In general, genetic morphological index of quantitative traits were greater than those of the quality traits. The tested materials were divided into four groups by cluster analysis. Barley accessions in group Ⅰ were two-rowed, high plant height, big spike and big grain. Barley accessions in group Ⅱwere short plant height, multi grain and long spike. Barley accessions in group Ⅲ were short panicle. Barley accessions in group Ⅳ were high plant height and multi grain. Based on the principal components, comprehensive evaluation of various materials was carried out, seven principal components were extracted to summarize most of the biological information of all traits. Excellent germplasm resources suitable for growth in Jiangsu Province were screened out. This study provided a theoretical basis for the collection and utilization of hulless barley accessions.