GENERATION MEAN ANALYSIS FOR FRUIT YIELD AND COMPONENT TRAITS IN BELL PEPPER (Capsicum annuum L. var. grossum Sendt.)
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Date
2013
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CSK Himachal Pradesh Krishi Vishavavidyalaya, Palampur
Abstract
The present investigation entitled “Generation mean analysis for fruit yield and component traits
in bell pepper (Capsicum annuum L. var. grossum Sendt.)” was carried out with the objectives of getting
the information on gene action for important fruit yield and component traits, inheritance of bacterial wilt
resistance and to develop breeding material for selecting bacterial wilt resistant and horticulturally desirable
progenies in the segregating generations. The experiments were carried out by utilizing six generations (P1,
P2, F1, F2, BC1 and BC2) of four crosses viz., EC-464107 × KS, EC-464115 × KS, EC-464107 × EC-464115
and EC-464107 × SH-I, evaluated in a Randomized Block Design with three replications during summerrainy
season, 2012. Simultaneously, the above experiment was also repeated in bacterial wilt sick plots
alongwith susceptible checks Indira and California Wonder to work out the genetics of inheritance of
bacterial wilt resistance.
The results of scaling tests revealed that additive-dominance model was inadequate in all the
crosses for all the traits. For gross fruit yield per plant, all the four cross combinations revealed positive and
relatively higher magnitude of dominance [h] gene effects along with complementary gene action in the
cross EC-464107 × EC-464115 and duplicate type of epistasis in the cross EC-464107 × SH-I whereas for
marketable fruit yield per plant, the crosses EC-464107 × KS, EC-464115 × KS and EC-464107 × SH-I
expressed higher magnitudes of dominance [h] gene effects along with complementary gene action in the
former cross and duplicate type of epistasis in the latter. This suggested the usefulness of exploiting hybrid
vigour in these crosses. For total fruits per plant, the magnitude of dominance [h] gene effects and additive
× additive [i] gene interactions were positive and higher coupled with duplicate epistasis in the crosses EC-
464107× KS, EC-464115 × KS and EC-464107 × SH-I whereas for marketable fruits per plant, all the four
cross combinations exhibited positive and higher dominance [h] and additive × additive [i] gene
interactions coupled with duplicate type of epistasis in the crosses viz., EC-464115 × KS, EC-464107 ×
EC-464115 and EC-464107 × SH-I. This suggested the exploitation of heterosis breeding as well as the
selection of desirable seggregants through pedigree method in theses crosses.
Genetics of bacterial wilt resistance revealed that single dominant gene governed bacterial wilt
resistance in the cross EC-464107×SH-I whereas two genes with dominant and recessive epistasis in the
crosses viz., EC-464107 × KS and EC-464115 × KS. Studies on extent of heterosis and mean performance
suggested that the hybrid EC-464107 × SH-I was the most consistent for earliness while the cross EC-
464107 × KS was more reliable for gross fruit yield and marketable fruit yield per plant. However, the
hybrid EC-464115 × KS was the best for quality traits. These hybrids were also resistant to bacterial wilt
and can be included for testing in multilocational trials before their release in bacterial wilt prone areas.
Description
Doctoral Dissertation
Keywords
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