干旱区生态环境知识资源中心

Bouteloua curtipendula Michx. Torr. (sideoatsgrana) is a native grass in Mexico, but a structured use of its genetic diversity is missing. Amplified fragments length polymorphism (AFLP) analysis was conducted to define genetic relationships among 90 sideoatsgrama populations. Five AFLP primer combinations of EcoRI and MseI produced 281 bands, 36.6% of which were polymorphic, and the 104 most consistent of these were used for analysis. Genetic similarities were based on the Jaccard coefficient. Functional groups were established through principal component analysis (PCA) and cluster analysis (CA). Jaccard’s coefficients varied from 0.0 to 0.82. Polymorphic bands ranged from 11 for EcoRI-AGG+MseI-CTA, to 29 for EcoRI-ACA+MseI-CAC. PCA established two groups based on genetic polymorphism that were consistent with the CA. The two first principal components explained 21.8% of the total variation. The PCA provided evidence to integrate germplasm of populations from Mexico’s semi-arid areas. The dendogram resulting from unweighted pair group methods using arithmetic averages (UPGMA) divided the 90 populations in two groups. Genetic variability in these populations was directly related to the geographic origin of the germplasm, as well as to seed movement due to different factors. Native sideoatsgrama populations, in Mexico, maintain high levels of genetic variation, and this study provides useful information for its efficient use and conservation.