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“STUDIES ON COMBINING ABILITY AND HETEROSIS FOR DEVELOPING HYBRIDS IN RICE (Oryza sativa L.)”

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Title “STUDIES ON COMBINING ABILITY AND HETEROSIS FOR DEVELOPING HYBRIDS IN RICE (Oryza sativa L.)”
 
Creator Ghosh, Shyam Chandra
 
Contributor Chandrakar, P.K.
Sarawagi, A.K.
Rastogi, N.K.
Pandey, N.
Saxena, R.R.
 
Subject COMBINING ABILITY, HETEROSIS, RICE (Oryza sativa L.)
Genetics and Plant Breeding
 
Description A study entitled “ Studies on combining ability and heterosis for developing hybrids in rice (Oryza sativa L.)” was conducted at Research Farm, Department of Genetics and Plant Breeding, Indira Gandhi Krishi Vishwavidyalaya, Raipur Chhattisgarh during Rabi 2009-10 and Kharif 2010 to evaluate the variability, to estimate the GCA of parents and SCA of hybrids, to assess the magnitude of heterosis for various yield and related traits and to identify the maintainers and restorers for different CMS lines under study.
The experimental material included three CMS lines viz., APMS 6A, CRMS 31A and IR 79156A and seven testers viz., NPT 2-2-694-1, NPT 9, NPT 80-1, ET 1-12, ET 113, TOX 981-11-2-3 and R 1244-1246-1-605-1 and their twenty one F1s were generated in line x tester pattern for the estimation of various genetic parameters, combining ability and heterosis. These hybrids and parents were raised in Randomized Complete Block Design (RCBD) with two replications. The data obtained was subjected to line x tester analysis.
Combining ability and heterosis was worked out for characters viz., days to 50% flowering, pollen fertility (%), flag leaf length, flag leaf width, flag leaf area, plant height, productive tillers per plant, panicle length, fertile spikelets per panicle, sterile spikelets per panicle, number of spikelets per panicle, number of spikelets per plant, spikelet fertility (%), thousand grain weight, grain yield per plant and head rice recovery (%). The analysis of variance revealed the predominance of non-additive gene action for the all characters under study, indicating the possibility of exploitation of heterosis.

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Among the CMS lines studied, it was revealed that the CMS line IR 79156A was found to be the good general combiner and among testers NPT 80-1, TOX 694-11-2-3 and R 1244-1246-1-605-1 were found to be good general combiners for grain yield per plant, pollen fertility (%), fertile spikelets per panicle and spikelets per panicle.
The hybrids APMS 6A/TOX 694-11-2-3, CRMS 31A/ET 1-12, IR 79156A/NPT 80-1 and IR 79156A/ET 1-13 were identified as a good combinations on the basis of SCA effects, per se performance for grain yield per plant and its attributes viz., head rice recovery (%), pollen fertility (%), spikelets per panicle, 1000 seed weight and days to 50 % flowering.
Crosses APMS 6A/ET 1-13, CRMS 31A/NPT 80-1, CRMS 31A/ET 1-12, IR 79156A/NPT 80-1 and IR 79156A/ET 1-13 were identified as good heterotic hybrids for grain yield per plant, pollen fertility (%), spikelets fertility (%) and spikelets fertility (%).
Based on the pollen fertility percent and spikelet fertility percent, six genotypes were identified as potential restorer viz., ET 1-12, NPT 2-2-694-1, NPT 9, NPT 80-1, TOX 981-11-2-3 and R 1244-1246-1-605-1. Testers viz., TOX 981-11-2-3, ET 1-12 for APMS 6A; NPT 9, NPT 80-1, TOX 981-11-2-3, ET 1-12; R 1244-1246-1-605-1 for CRMS 31A; NPT 2-2-694-1, TOX 981-11-2-3; NPT 80-1 for IR 79156A identified were as potential restorers. Three genotypes in different combinations, were identified as potential maintainers viz., ET 1-13 and NPT 2-2-694-1 for APMS 6A; NPT 2-2-694-1 for CRMS 31A and NPT 9 for IR 79156A.
 
Date 2016-12-21T14:14:47Z
2016-12-21T14:14:47Z
2011
 
Type Thesis
 
Identifier 149 p.
http://krishikosh.egranth.ac.in/handle/1/91842
 
Language en
 
Format application/pdf
 
Publisher Indira Gandhi Krishi Vishwavidyalaya, Raipur