Articles
GENETIC CONTROL OF SEED GERMINATION AND PHYSIOLOGICAL QUALITY IN ORNAMENTAL PEPPER
Article number
1087_55
Pages
409 – 413
Language
English
Abstract
The knowledge of the genetic effects of quantitative traits is important for the success of a breeding program.
Peppers are multiplied by seeds, and there is no information about the heritability of seed germination and the physiological quality of seeds.
The objective of this study was to evaluate the inheritance of seed germination and vigor in ornamental pepper (Capsicum annuum). Two accessions (UFPB 77.3 and UFPB 76) belonging to the germplasm bank of Universidade Federal da Paraiba (UFPB) were used as parents.
These accessions were crossed to produce F1. The F1 hybrids were backcrossed with their parents to generate the backcross progenies (BC1 and BC2), and were self-pollinated to generate the F2 generation.
The six generations (P1, P2, F1, F2, BC1 and BC2) were sown in plastic boxes, using moistened paper as a substrate.
Evaluated traits were germination at 14 days (G14), germination at 21 days (G21), Germination Velocity Index (GVI), root length (RL), and shoot length (SL). Data were subjected to generation analysis.
Genotypic variance was higher than the environmental variance only for G14 and GVI. The narrow-sense heritability was lower than 40% for all characters.
The degree of dominance indicates dominance and overdominance gene effect for all traits.
These effects are unfavorable for selection.
The additive-dominant model was sufficient to explain four traits G21, GVI, RL and SL with higher correlation values (70%). Only the trait G14 was explained by the full model, indicating influence of epistatic effects.
Peppers are multiplied by seeds, and there is no information about the heritability of seed germination and the physiological quality of seeds.
The objective of this study was to evaluate the inheritance of seed germination and vigor in ornamental pepper (Capsicum annuum). Two accessions (UFPB 77.3 and UFPB 76) belonging to the germplasm bank of Universidade Federal da Paraiba (UFPB) were used as parents.
These accessions were crossed to produce F1. The F1 hybrids were backcrossed with their parents to generate the backcross progenies (BC1 and BC2), and were self-pollinated to generate the F2 generation.
The six generations (P1, P2, F1, F2, BC1 and BC2) were sown in plastic boxes, using moistened paper as a substrate.
Evaluated traits were germination at 14 days (G14), germination at 21 days (G21), Germination Velocity Index (GVI), root length (RL), and shoot length (SL). Data were subjected to generation analysis.
Genotypic variance was higher than the environmental variance only for G14 and GVI. The narrow-sense heritability was lower than 40% for all characters.
The degree of dominance indicates dominance and overdominance gene effect for all traits.
These effects are unfavorable for selection.
The additive-dominant model was sufficient to explain four traits G21, GVI, RL and SL with higher correlation values (70%). Only the trait G14 was explained by the full model, indicating influence of epistatic effects.
Authors
P.A. Barroso, A.M. dos S. Pessoa, G.D.A. Medeiros, J.J. da Silva Neto, E.R. Rêgo, M.M. Rêgo
Keywords
Capsicum, full model, additive-dominant model, heritability, breeding
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