DOES CYTOPLASM INFLUENCE THE EXPRESSION OF FRUIT YIELD, FRUIT QUALITY TRAITS AND RESPONSES TO ANTHRACNOSE DISEASE AND THRIPS INFESTATION IN CHILLI (Capsicum annuum L.)?
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Date
41123
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Commercialization of cytoplasm-nuclear genetic male sterile (CNMS)
hybrids in chilli would be justified if CMS hybrids offer additional benefits either
in terms of improved performance, quality or they are comparable to
conventional hybrids for defense traits. Under this premise, 42 iso-nuclear
alloplasmic hybrids (21 each of A×R & B×R crosses involving 3 CNMS (A) lines,
their counterpart fertile (B) lines and 7 restorer (R) lines), were evaluated at the
Experimental Plots, ‘K’ Block and Hot Pepper Improvement Unit, Department of
Genetics & Plant Breeding, University of Agricultural Sciences, GKVK,
Bangalore during 2011 dry and rainy seasons, to assess the cytoplasmic effects
in terms of parental gca effects, hybrid mean performance, sca effects and midparent
heterosis on fruit yield and its contributing traits, fruit quality traits
(ascorbic acid, capsaicin, oleoresin & phenols) and response to anthracnose
disease and thrips infestation.
A×R hybrids as a group differed significantly from those of B×R hybrids
as a group for fresh green fruit yield plant-1, ascorbic acid and capsaicin
contents, suggesting cytoplasmic influence on expression of these traits.
Significant differences between A- and B- lines for their gca effects was
an indication of male sterility inducing cytoplasm effects on the ability of the
lines to combine with common testers. The differences between A×R and B×R
crosses for mean performances, sca effects and mid-parent heterosis was
significant. However, the direction and magnitudes of differences (where
detected) was of lower magnitudes and varied with the trait as well as nuclear
genetic background of the genotype and the crosses.
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