Genetic diversity in four cabbage populations: Based on UPOV and IPGRI description foams and allozyme variation

Morphophysiological characters, designated as descriptors by the Internatio nal Union for the Protection of New Varieties of Plants (UPOV) and the Inte rnational Plant Genetic Resources Institute (IPGRI), and allozyme variation were used to study genetic diversity among four cabbage (Brassica oleracea L. var. capitata L.) open pollinated (OP) populations. The morphological a nd physiological characters, and gene frequencies among OP populations were analysed by using cluster (CPI) and principal component analysis (PCA). Bo th methods gave the same clustering of OP populations. The relationships fo und among OP populations by analysing UPOV descriptors (30 characters) and IPGRI descriptors (30 + 14 characters) were similar. The relationships amon g OP populations obtained from gene frequencies were not similar to those o btained from morphophysiological characters, but two of the four OP populat ions were clustered together by both categories of data. The biggest correl ation between the relationships among OP populations obtained from morphoph ysiological characters and those obtained from gene frequencies was r = -0. 44 and r = -0.38 given by PCA and CA respectively. The importance of each c haracter or allele with respect to the relationships among OP populations w ere also detected by PCA.