STUDIES ON GENE ACTION, COMBINING ABILITY AND HETEROSIS FOR YIELD AND ITS COMPONENT TRAITS IN RICE FOR UPLAND CONDITION OF HIMACHAL PRADESH
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Date
2020-08-05
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CSKHPKV Palampur
Abstract
The present study was undertaken to estimate the nature and magnitude of gene action, combining
ability and heterosis for yield and its component traits in rice using line × tester mating design. During
Kharif, 2018, eleven lines of rice viz., HPR 2410, HPR 2652, HPR 2703, HPR 2842, HPR 2869, HPR
2874, HPR 2876, HPR 2881, HPR 2883, LGP 26 and LGP 123 were crossed with three testers viz.,
HPR 1156, HPR 2656 and HPR 2795. These thirty-three crosses along with their parents were evaluated
in RBD during Kharif, 2019 at the Experimental Farm of R&WRC, Malan.
Analysis of variance for line × tester mating design with respect to parents, crosses and
parents vs. crosses revealed significant differences for all the traits studied except days to 50%
flowering, total tillers/plant, grain breadth and L: B ratio. Magnitude of additive genetic variance (σ2A)
was found to be higher than dominant genetic variance (σ2D) for days to 50% flowering, days to
maturity, grain length, grain breadth and L: B ratio, whereas, magnitude of dominant genetic variance
(σ2D) was found to be higher for plant height, panicle length, total tillers/plant, effective tillers/plant,
spikelets/panicle, grains/panicle, spikelet fertility, grain yield/plant and 1000-grain weight.
Heritability (narrow-sense) was low (< 50%) for all the traits, although the highest narrowsense
heritability was observed for the days to maturity (34.78%) followed by spikelets/panicle
(27.33%) and spikelet fertility (26.38%). Genetic advance was highest for grain length (99.43%)
followed by days to 50% flowering (92.68%), panicle length (76.47%) and plant height (73.10%).
The line, HPR 2410 is good general combiner for days to maturity, plant height, grains/panicle
and 1000-grain weight, HPR 2703 is good general combiner for plant height, panicle length, total
tillers/plant, effective tillers/plant, spikelets/panicle and grain yield/plant, HPR 2842 is good general
combiner for days to maturity, grains/panicle, spikelet fertility, grain length and L: B ratio, HPR 2869
is good general combiner for plant height, panicle length, spikelets/panicle, grains/panicle and grain
yield/plant, HPR 2876 is good general combiner for days to 50% flowering, days to maturity, panicle
length and grain length, and LGP 26 is good general combiner for days to maturity, total tillers/plant,
effective tillers/plant, grain yield/plant, 1000-grain weight, grain length and grain breadth.
The cross, HPR 2881 × HPR 2656 is good specific combination for plant height, panicle
length, spikelets/panicle, grains/panicle and the cross HPR 2652 × HPR 2656 is good specific
combination for days to maturity, total tillers/plant, effective tillers/plant, spikelets/panicle,
grains/panicle, grain yield/plant and the cross HPR 2869 × HPR 1156 is good specific combination for
days to 50% flowering and L: B ratio. The cross LGP 26 × HPR 1156 is good specific combination for
spikelets/panicle, grain yield/plant, 1000-grain weight and grain breadth. The cross HPR 2876 × HPR
2656 is good specific combination for spikelet fertility and grain length.
Cross combinations LGP 26 × HPR 1156 followed by HPR 2703 × HPR 2795, HPR 2652 ×
HPR 2656, HPR 2881 × HPR 2656, HPR 2876 × HPR 1156 and HPR 2869 × HPR 2656 exhibited
highest heterosis over standard check for grain yield/plant.
All the genotypes/cross combinations seemed to be highly resistant or resistant to leaf blast
and neck blast under natural conditions during the crop season.