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Development of High Yielding Single Cross Hybrids from newly Developed Inbred Lines of Maize (Zea mays L.)

KrishiKosh

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Title Development of High Yielding Single Cross Hybrids from newly Developed Inbred Lines of Maize (Zea mays L.)
 
Creator Netravati
 
Contributor G. Shanthakumar
 
Subject Genetics and Plant Breeding
 
Description A study was conducted to assess the combining ability, nature of gene action
and extent of heterosis in respect to grain yield, its componental traits and quality
characters, involving 91 hybrids (developed through half diallel), 14 inbreds and 16
commercial checks in maize during kharif 2011-12 at MARS, University of
Agricultural Sciences, Dharwad. The analysis of variance indicated significant
amount of variability among genotypes for 15 quantitative characters studied. The
computed variance ratios (GCA:SCA variance) revealed the predominance of nonadditive
gene action in the inheritance of all the traits. The study on the combining
ability revealed that the lines DMIL 9 (5.160) and DMIL 5 (4.566) were found to be
best general combiners for grain yield per plant and grain yield per hectare than the
rest. The study on standard heterosis revealed that 5 hybrids viz.,DMIL 9 x DMIL 5
(23.23 %), DMIL 10 x DMIL 7 (19.60 %), DMIL 4 x DMIL 3 (19.24 %), DMIL 8 x
DMIL 7 (18.97 %) and DMIL 14 x DMIL 10 (16.70 %) exhibited significant positive
heterosis over best commercial check NK 6240 and also exhibited significant sca
effect for grain yield and its components, obtained from the parents with high x high
gca effects. It is suggested to evaluate the identified hybrids in large scale trail to
confirm their superiority. The hybrids, DMIL 10 x DMIL 3 (29.22 %), DMIL 10 x
DMIL 9 (14.79 %), DMIL 11 x DMIL 10 (14.61 %) and whereas DMIL 10 x DMIL
3 (3.55 %), DMIL 9 x DMIL 3 (3.38 %), DMIL 7 x DMIL 3 (3.22 %) were top
crosses showed the significant heterosis as well as sca effects for protein content and
starch content, respectively. Most of these were obtained from the parents with high x
high gca effects. These results revealed the possibility of realizing higher yield and
quality through heterosis breeding.
 
Date 2016-11-21T17:19:17Z
2016-11-21T17:19:17Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/86784
 
Format application/pdf
 
Publisher UAS, Dharwad