BREEDING FOR THRIPS RESISTANCE IN CHILLI (Capsicum annuum L.)
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Date
2015-06
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University of Horticultural Sciences, Bagalkot
Abstract
A field experiment was conducted during Kharif 2014-15 to study the
genotypic reaction to thrips, basis of resistance and genetic studies involving 46 chilli
(Capsicum annuum L.) genotypes in randomised block design with two replications at
Horticulture Research and Extension Station, Haveri (Devihosur). The genotypic
reaction to thrips indicated that 7 genotypes of chilli showed moderately resistance to
thrips, while 37 genotypes were susceptible and two genotypes were highly
susceptible for the thrips infestation. The lowest per cent of damage was found in
Phule Jyothi (15.63%) whereas, Byadgi Kaddi (65.47%) and Byadgi Dabbi (64.38%)
recorded the highest thrips damage.
The quantum of genetic variation as genotypic co-efficient of variation (GCV)
was highest in biochemical and nutritional traits viz., non reducing sugar, phenols,
phosphorus, potassium, magnesium, total chlorophyll, capsaicin content (green and
red fruits), and capsanthin. Moderate GCV was estimated for growth and yield
parameters like plant height, plant spread, leaf area, plant canopy width, number of
primary branches per plant, number of fruits per plant and fruit yield per plant.
However, average fruit weight was noticed highest GCV as compared to the other
yield characters. All growth, yield, biochemical and nutritional parameters showed
high heritability coupled with high genetic advance over mean.
The character association revealed that fruit yield per plant was found positive
and significant association with plant height, plant spread, number of primary
branches per plant, number of fruits per plant and phosphorus content. The thrips
incidence was found positive and significantly correlated with reducing sugars,
calcium and sulphur whereas, negative and significantly correlated with fruit yield per
plant, number of primary branches per plant, number of fruits per plant, non reducing
sugar and total chlorophyll. Results of path analysis revealed that plant height,
number of primary branches per plant, number of fruits per plant, total sugars showed
the desirable positive and high direct effect on fruit yield. However, thrips incidence
showed positive direct effect on reduction of fruit yield per plant. From the present
study, it can be concluded that Phule Jyothi was superior with higher fruit yield per
plant and least thrips incidence.