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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.2020.9(1): 2195-2205
DOI: https://doi.org/10.20546/ijcmas.2020.901.249


Genetic Gain in Testcrosses Derived from Heat Tolerant Multi-parental Synthetic Populations of Maize
Muttappa Hosamani1*, I. Shankergoud1, P. H. Zaidi2, Ayyanagouda Patil1,
T. Vinayan2, P. H. Kuchanur1*, K. Seetharam2 and Somasekhar1
1University of Agricultural Sciences, Raichur-584 104, Karnataka, India
2International Maize and Wheat Improvement Center (CIMMYT) – Asia, ICRISAT Campus, Patancheru-502324, Hyderabad, India
*Corresponding author
Abstract:

Heat stress due to prolonged high ambient temperature during critical growth stages is a serious threat to crop production worldwide. Though being a C4 crop, maize has relatively wider adaptation, however, weather extremes such as heat stress is challenging its threshold limits.  There is an absolute requirement of heat tolerant cultivars in the present condition as climate change has a become reality. This study was designed to assess the genetic gain in various stress-adaptive traits of maize testcrosses derived from two heat tolerant heterotic multi-parental synthetic (MPS 1 and MPS 2) populations. The trial consisted of 405 F2:3 testcrosses derived from MPS 1 along with two commercial checks and 470 F2:3 testcrosses derived from MPS 2 along with five commercial checks. They were evaluated in Alpha lattice design with two replications at Main Agriculture Research Station, Raichur, Karnataka during spring season where the most part of reproductive stage, starting from tassel emergence until late grain filling, was exposed to heat stress. Analysis of variance revealed that the mean sum of squares due to genotypes in MPS 1 differed significantly for grain yield and MPS 2 showed significant variation among genotypes for all the characters studied, indicating the presence of variability for all the traits in the germplasm utilized for present study. The top 10 per cent of the F2:3 families of MPS 1 and MPS 2 populations were selected based on their testcross performance and subjected to genetic gain study. The maximum genetic gain was observed for grain yield (58.55%), days to 50 per cent anthesis (-2.05%), days to 50 per cent silking (-2.24%), ASI (-3.35%), plant height (4.25%) and ear height (5.49%) in MPS 1 population compared to MPS 2 population. These results suggest that, a new and advanced elite heat tolerance lines isolated from the early segregating progeny that produced very good testcrosses in different heterotic groups. These elite heat tolerant lines would be useful to maize breeders for improving heat stress resilience in maize.


Keywords: Maize, Testcrosses, Multi-parent population (MPS), Genetic gain
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How to cite this article:

Muttappa Hosamani, I. Shankergoud, P. H. Zaidi, Ayyanagouda Patil, M. T. Vinayan, P. H. Kuchanur, K. Seetharam and Somasekhar. 2020. Genetic Gain in Testcrosses Derived from Heat Tolerant Multi-parental Synthetic Populations of Maize. Int.J.Curr.Microbiol.App.Sci. 9(1): 2195-2205. doi: https://doi.org/10.20546/ijcmas.2020.901.249