Evaluation of the Phenotypic Variability in the Field Beans Collection (Phaseolus vulgaris L.)
Tz. STOILOVA1 and G. PEREIRA2
1 Institute of Introduction and Plant Resources, BG-4122 Sadovo, Bulgaria
2 National Selection Station, 7350 Elvas, Portugal
STOILOVA, Tz. and G. PEREIRA, 1999. Evaluation of the phenotypic variability in the field beans collection (Phaseolus vulgaris L.). Bulg. J. Agric. Sci., 5: 841-848
The present study was carried out within 1995 – 1997 at the Institute of Introduction and Plant Resources of Sadovo. The study involved 115 bean samples (P. vulgaris L.) of different geographic origin. Sowing was done in the period April 15-20 at the experimental field of the Institute.
The objective of the present study is to make a complex morphological and economic characteristic of the samples in view of their future utilization in the selection programs. We applied Principal Component Analysis (PCA) and Cluster Analysis (CA) for the purpose.
The evaluation of phenotypic variation by means of multivariate analysis gives the opportunity to identify the samples of the most valuable morphological and economic parameters. Samples No. 16, 39, 43, 37, 36 and 27 are of special interest due to their high positive values along the first principal component (PC1) (Figure 1, A). All these samples are characterized with higher plants, larger number of pods and seeds per plant, higher pod and seed weight per plant and, therefore, higher productivity.
According to cluster analysis, samples are distributed into seven basic groups with different average values of the indexes observed. Samples of groups 4, 6 and 7 are distinguished for highest plant height, highest disposition of the lowest pod and highest productivity. The most perspective samples could be included in competition cultivar tests.
The diversity obtained gives the possibility to select the most suitable ones for attaining future breeding objectives.
Key words: genetic resources, beans, evaluation, morphology, PCA, CA