Repeatability and divergence among genotypes of Desmanthus sp. in a semiarid region

Abstract: The objective of this work was to evaluate the divergence among genotypes Desmanthus sp. regarding morphological, productive, and qualitative characteristics, as well estimate number observations necessary predict real value these characteristics. experiment conducted in semiarid state Pernambuco, Brazil, using 26 from different locations region. Seven evaluations were carried out July 2013 2014. Tocher’s grouping method standardized average Euclidean distance used. coefficients repeatability (r) determination (R2) estimated two models analysis variance, principal components based on correlation or covariance matrix, structural matrix. variables with greatest weights stem diameter, leaf area index, forage yield, frequencies 22.05, 17.57, 14.58%, respectively. Morphological, variability observed All characteristics presented r R2 high magnitude methods analysis. Up four evaluation cycles are required (R2=95%) peduncle length, plant height, length width, leaves, pod length.