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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2020)
[Effective from January 1, 2020]
For more details click here

ICV 2018: 95.39
Index Copernicus ICI Journals Master List 2018 - IJCMAS--ICV 2018: 95.39
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com / submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2018.7(2): 1765-1774
DOI: https://doi.org/10.20546/ijcmas.2018.702.214


Combining Ability Analysis in Bt Cotton (Gossypium hirsutum L.) to Harness High Yield under Contrasting Planting Densities through Heterosis Breeding
Gowtham Prakash1*, S.L. Korekar2 and Sandeep Mankare2
1Department of Botany, Yeshwant Rao Chavan College, Tuljapur, Osmanabad, Mahrashtra-413 601, India
2Affiliated to, Dr. BAMU, Aurangabad, Maharashtra-431 004, India
*Corresponding author
Abstract:

Biometric analysis was taken up to assess the combining ability of set of Bt cotton parents to harness high yield under contrasting planting densities through heterosis breeding. Twenty test crosses were generated out of Line (5) X Tester (4) mating design involving selected parents with diverse plant architecture. Field experimentation with randomized complete block design (RCBD) with three replicates was adopted to generate the quantitative data on maturity, plant architecture, yield components and key fibre quality traits under conventional density planting (CDP) and high density planting (HDP). The pooled analysis of variance for combining ability revealed significant line x tester interaction effect for all the traits under both planting densities whereas standalone line and tester effects displayed varying effects for array of traits. Proportion of gca/sca variance found to be higher for traits such as days to 50% flowering, days to first boll opening, number of monopodial branches, ginning out turn, seed index, 2.5% span length, bundle strength and micronaire value indicating the preponderance of additive gene action. On contrary, for traits such as plant height, number of sympodial branches, boll weight, number of bolls per plant, seed cotton yield per plant recorded fractional values, indicating the prevalence of non-additive gene action. This phenomenon intern warrants for heterosis breeding as choice of method for genetic improvement of corresponding traits. Line SC1134 and tester SC1205 found to be good general combiner for the majority of the traits with broader utility, which could be explored as potential parents to breed for versatile hybrids for contrasting plant densities. And also identified, test cross combinations SC1104 X 1205 and SC1134 X SC1133 with high magnitude of sca effects under CDP and HDP respectively. These combinations can be considered as potential F1 hybrid crosses to achive high yield potential through heterosis breeding.


Keywords: Biometric, Line X Tester, Bt, Heterosis, Combining ability, Plant architecture
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How to cite this article:

Gowtham Prakash, S.L. Korekar and Sandeep Mankare. 2018. Combining Ability Analysis in Bt Cotton (Gossypium hirsutum L.) to Harness High Yield under Contrasting Planting Densities through Heterosis Breeding.Int.J.Curr.Microbiol.App.Sci. 7(2): 1765-1774. doi: https://doi.org/10.20546/ijcmas.2018.702.214