Indian Society of Genetics & Plant Breeding

Gene action and fertility restoration behavior of the tropical japonica/ indica, japonica/indica derived restorers in rice (Oryza sativa L.)

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To study the gene action and fertility restoration behavior
of tropical japonica/indica and japonica/indica derived
advanced breeding lines, seven testers comprising new
plant type i.e. NPT 2-2-694-1, NPT 9, NPT 80-1 and elite
testers i.e., ET 1-12, ET 1-13, TOX 981-11-2-3 and R 1244-
1246-1-605-1 along with three CMS lines i.e., APMS 6 A,
CRMS 31 A and IR 79156 A and their generated 21 F1 crosses
were evaluated for yield and yield attributing traits in a
randomized complete block design (RCBD) during wet
season, 2010. The phenotypic quantitative data was
undertaken as per L x T analysis. The genetic analysis
registered the preponderance of positive non-additive gene
action for all the traits, whereas negative for flag leaf length.
All the seven testers exhibited either minor or additive
cytoplasmic gene action which influenced the fertility
restoration behavior of different combinations of the same
pollen parent. The probability of the potential restorer
combination (47.76) was more followed by partial restorers
(28.57), potential maintainers (19.04) and partial maintainer
(4.00). The high x high allelic reaction was highest in
potential restorer combinations (70.00%) followed by partial
restorers (16.67%), potential maintainers (0%) and partial
maintainer (0.0%).The additive x additive reaction was found
for the fertility restoration in 70% restorer combinations.

Keywords: Oryza sativa L., CMS line, line x tester, variance, gene-action, additive, dominance, fertility restoration

Info

Year: 2013
Volume: 73
Issue: 1
Article DOI: 10.5958/j.0019-5200.73.1.003
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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