QUANTITATIVE AND MULTICATEGORIC DESCRIPTORS FOR PHENOTYPIC VARIABILITY IN A SEGREGATING GENERATION OF ORNAMENTAL PEPPERS

Multivariate techniques were used to evaluate divergence among 15 phenotypic classes of Capsicum annuum, in a segregating generation belonging to the germplasm bank of Universidade Federal da Paraíba-UFPB. Quantitative (19) and qualitative (11) descriptors proposed by the International Plant Genetic Resources Institute were used.
The experiment was conducted in a greenhouse, in a completely random design.
Grouping of genotypes used Tocher’s method based on Euclidean distance.
The evaluated variables were both quantitative (stem diameter, plant height, first bifurcation height, plant width, leaf length, leaf length without pedicel, leaf width, pedicel length, fruit length, major fruit width, minor fruit width, fruit weight, fruit wall thickness, seed set, fruit fresh matter, fruit dry matter, fruit dry matter content, 100 seed weight, fruit set) and qualitative (stem color, anthocyanin content, stem form, stem pubescence, plant growth habit, branch density, leaf density, corolla color, immature fruit color and fruit format). Tocher’s method indicated seven groups: the first group contained seven phenotypic classes, the second three classes and the other groups had only one class.
The applied methodology was capable of detecting genetic variability in the F₂ generation and could help to select desirable phenotypes.

XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): International Symposium on Advances in Ornamentals, Landscape and Urban Horticulture

E. Ramalho do Rêgo, R.M. Cortez dos Santos, M. Monteiro do Rêgo, N.F.F. do Nascimento, M.F. Nascimento, M.A. Bairral

segregation, Capsicum, breeding, genetic resources

https://doi.org/10.17660/ActaHortic.2012.937.35