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.)
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Creator |
PRAVEEN KUMAR, G
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Contributor |
NARSIMHA REDDY, V
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Subject |
yields, grain, planting, hybrids, heterosis, maize, biological phenomena, crossing over, developmental stages, silk
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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 |
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Date |
2016-06-14T12:26:19Z
2016-06-14T12:26:19Z 2013 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/67344
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Language |
en
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Relation |
D9327;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
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