COMBINING ABILITY FOR GROWTH AND YIELD TRAITS IN MULBERRY (Morus spp.) AND REARING PERFORMANCES OF SILKWORM (Bombyx mori L.)
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Date
2018-09-08
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University of Agricultural Sciences, Bengaluru
Abstract
The study was conducted to evaluate Combining ability for growth and yield
parameters in ten mulberry crosses which were obtained by crossing five lines with two
testers in linextester design. The combining ability analysis revealed the presence of
higher magnitude of SCA than GCA variance for most of the characters under study
except for internodal distance, leaf area and leaf moisture content and the ratio of additive
to dominance variance was lower than one, indicating predominance of non-additive gene
action for most of the traits except for internodal distance. Among five lines, MI-139 was
the best general combiner since it recorded significant positive gca effect for number of
branches per plant, number of leaves per plant, leaf to shoot ratio, leaf yield per plant.
Whereas, ME-18 was found to be the best general combiner for plant height. Among
testers MI-04 was found to be the best general combiner since it expressed significant
negative gca effect for internodal distance in desirable direction. Out of ten crosses MI-
516×MI-04, MI-139×C-776 and MI-47×MI-04 were good performers with high sca
effects. Bioassay was conducted by feeding leaves of each mulberry crosses separately to
silkworm hybrid PM×CSR2 during favorable conditions of rainy and winter season.
When silkworms were fed with leaves of MI-516×MI-04 recorded highest larval weight
(22.70g/10 larvae) in fifth instar fifth day, total larval duration (25.50days), ERR
(98.00%), single cocoon weight (1.51g), single shell weight (0.34g), silk productivity
(6.18cg/day), silk filament length (872.10m) and silk filament weight (0.26g) compared
to other crosses under study.
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