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COMBINING ABILITY STUDIES IN NEWLY DEVELOPED INBRED LINES IN MAIZE (Zea mays L.)

KrishiKosh

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Title COMBINING ABILITY STUDIES IN NEWLY DEVELOPED INBRED LINES IN MAIZE (Zea mays L.)
 
Creator PRAVEEN KUMAR, G
 
Contributor NARSIMHA REDDY, V
 
Subject yields, grain, planting, hybrids, heterosis, maize, biological phenomena, crossing over, developmental stages, silk
 
Description The present investigation “Combining ability studies in newly developed
inbred lines in Maize (Zea mays L.)” had been undertaken in maize to carry out the
combining ability analysis and to estimate heterosis as well as to understand nature
of gene action, correlation and path analysis of yield and yield contributing
characters. Twenty lines were crossed with 3 testers in Line x Tester (L x T) design
during kharif, 2012. The resulting 60 crosses along with parents and standard checks
DHM 117, 900M Gold and NK 6240 were evaluated in a Randomized Block Design
replicated thrice, during Rabi, 2012-13 at Maize Research Centre, Agricultural
Research Institute, Rajendranagar, Hyderabad. The data were collected on days to
50 per cent tasseling, days to 50 per cent silking, days to maturity, plant height, ear
height, ear length, ear girth, number of kernel rows per ear, number of kernels per
row, 100-kernel weight, shelling percentage and grain yield per plant.
The study of analysis of variance for combining ability revealed the
preponderance of non-additive gene action for all of the traits favouring for the
exploitation of heterosis breeding. High general combining ability effects for grain
yield per plant were noticed in the inbred lines MRC 14, MRC 4, MRC 9, MRC 8,
MRC 7 and MRC 6 and tester BML 14. These parents had resulted in the production
of superior single crosses MRC 13 × BML 14, MRC 7 × BML 7, MRC 4 × BML 14
and MRC 15 × BML 14 for grain yield per plant. Hence, these inbred lines have
potential application in the crop improvement programmes.
The hybrids MRC 13 × MRC 14, MRC 7 × BML 7, MRC 3 × MRC 14, MRC
12 × MRC 7 and MRC 14 × MRC 7 were the good specific combiners for grain
yield per plant. Hence, these crosses could be advanced further for isolation of
transgressive segregants and also to develop good inbred lines for use in breeding
programmes.
Estimates of heterosis, heterobeltiosis and standard heterosis were variable
among crosses in desirable direction and some of them turned out to be best specific
crosses. The cross MRC 13 × BML 14 recorded significant positive heterosis for
grain yield over three standard checks DHM 117, 900M Gold and NK 6240. Hence,
this hybrid was identified as potential high yielding hybrid, which needs further
multi-location testing before its release as commercial hybrid.
Character association among grain yield per plant and yield contributing
characters exhibited that grain yield per plant was positively correlated with days to
maturity, plant height, ear height, ear length, ear girth, number of kernel rows per
ear, number of kernels per row, 100-kernel weight and shelling percentage.
Path coefficient analysis had shown highest direct positive relationship of 100-
kernel weight with grain yield per plant followed by number of kernels per row, ear
girth, ear length, plant height, shelling percentage, ear height and number of kernel
rows per ear. The indirect effect of these characters on grain yield was influenced
more by number of kernels per row, 100-kernel weight, ear girth and ear length.
The identified four superior cross combinations viz., MRC 13 × BML 14,
MRC 3 × BML 14, MRC 7 × BML 7 and MRC 14 × BML 7 in the present
investigation, based on per se performance, heterosis and combining ability,
performed well for grain yield and its one or two directly related components. These
crosses may be further tested before releasing as commercial hybrids
 
Date 2016-06-14T12:26:19Z
2016-06-14T12:26:19Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67344
 
Language en
 
Relation D9327;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY