GENOTYPE × ENVIRONMENTAL INTERACTION FOR GROWTH AND YIELD PARAMETERS OF TREE MULBERRY GENOTYPES IN DIFFERENT SEASONS AND BIOASSAY STUDIES OF SILKWORM Bombyx mori L.
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Date
2021-01-10
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University of Agricultural Sciences, Bangalore
Abstract
Exploitation of Genotype x Environment interaction for growth and yield parameters of tree mulberry genotypes in different seasons and Bioassay studies of silkworm Bombyx mori L. was undertaken during 2017-20 at the Department of Sericulture, UAS, GKVK, Bangalore-65. The mean data of each genotype for stability on thirteen yield and yield contributing traits were subjected to analysis of variance for different seasons. It is revealed that based on the selection indices, S6-rainy season 2019
was found more favourable for mulberry genotypes for good expression of shoot height, number of branches per tree, number of leaves per tree and leaf yield per tree. Variance due to G х S(linear) was moderately significant for number of branches per tree, total shoot length and single leaf area. Based on the stability parameters viz., mean(x̅), regression(bi) and deviation from regression(S2di) of eight tree mulberry genotypes indicated, V1 yielded stable performance across the seasons for most of the traits viz., number of leaves per tree, leaf yield per tree, fresh leaf weight, single leaf area, moisture
content and moisture retention capacity. The biochemical constituents of leaves of eight different tree mulberry genotypes were estimated. Among the genotypes, V1 recoded highest nitrogen content (3.62%), phosphorous (0.52%), potassium (1.38%), crude protein (22.67%), ash content (9.65%), crude fibre (9.33%), chlorophyll (2.41mg/g), phenols (3.52mg/100g), amino acid (9.39mg/g), carbohydrate (22.39%), sugar (14.13%) and starch content (13.48%). The bioassay studies of larval and cocoon parameters in different seasons revealed that the rearing performance of silkworms was better in rainy season followed by summer and winter seasons. By considering mean performance of
silkworm in different seasons V1 recorded highest larval and cocoon parameters viz., larval weight (28.62g), cocoon weight(1.80g), shell weight (0.31g), pupal weight (1.48g), effective rate of rearing (94.89%), filament length(805.37cm), filament weight(0.26g), filament denier (2.87) and silk productivity(3.63cg/day).