HETEROSIS AND COMBINING ABILITY STUDIES IN OKRA (Abelmoschus esculentus (L.) Moench)
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Date
2017-06
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UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT
Abstract
The present investigation was carried out with three objectives at experimental
block of vegetable crops in Haveli farm, Bagalkot, during kharif and rabi season in the
year 2016-17. The present study was undertaken to elicit information on the nature of
combining ability variance, effects, gene action and heterosis through diallel analysis
including reciprocals. The analysis of variance revealed presence of good variation for
all the character studied among parents as well as in hybrids. Comprehensive
assessment of parents by considering gca effects has resulted into identification of
parents, viz., MHO- 12, MHO- 16, MHO- 27 and KRCO-1 as good combiners for yield
and yield contributing characters. The crosses viz., MHO- 22× MHO- 27, MHO- 22×
KRCO-1 and MHO- 22× KRCO-8 were good specific combiners for yield and yield
related traits which can be used in future breeding programme. Combining ability
analysis revealed that sca effects are higher than gca effects for most of the traits
indicating the presence of both additive and non additive gene effects for inheritance of
the traits. Hence, direct selection for higher values of yield per plant can be practiced.
Comprehensive assessment of crosses by considering heterosis values revealed
that, out of thirty crosses, three were average heterotic (MHO- 22× MHO- 27, MHO-
22× KRCO-1 and MHO- 22× KRCO-8) and three were low heterotic (MHO-
12×KRCO-1, MHO-22×MHO-16 and MHO-12×KRCO-8).
The dominance effects (H1 and H2) were higher than the additive effect (D),
which showed the preponderance of non-additive gene action plays a greater role in the
inheritance for the characters in this study for plant height at 90 DAS, internodal length
at 45 and 90 DAS, number of branches at 45 and 90 DAS, number of leaves at 45 DAS,
fibre. The degree of dominance (H1/D)1/2 was more than unity for all traits except for
number of leaves at 45 and 90 DAS, average fruit weight, fruit length, fruit diameter
which indicates all these characters were had over dominance.
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