Genetic analysis of resistance to post flowering stalk rot in tropical germplasm of maize ( Zea mays L.)

Mir, Z R and Singh, P K and Zaidi, P H and Vinayan, M T and Sharma, S S and Krishna, M K and Vemula, A K and Rathore, A and Nair, S K (2018) Genetic analysis of resistance to post flowering stalk rot in tropical germplasm of maize ( Zea mays L.). Crop Protection (TSI), 106. pp. 42-49. ISSN 02612194

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Post flowering stalk rot (PFSR) is one of the major biotic constraints to maize production in tropical and sub-tropical environments. It is a complex disease caused by multiple pathogens, among which Fusarium moniliforme and Macrophomina phaseolina are the major ones that cause severe yield losses in the Asian tropics. A set of maize inbred lines was evaluated at two locations for Fusarium stalk rot (FSR) and Macrophomina stalk rot (MSR). Based on line evaluation trials, resistant and susceptible lines were selected and crossed following a Diallel mating design IV to study the gene action for resistance to these stalk rots and the estimating the combining ability of inbred lines. A 9 × 9 diallel (Diallel-A) produced 36 hybrids for studying FSR resistance, and a 12 × 12 diallel (Diallel-B) produced 66 hybrids to analyse the resistance towards both FSR and MSR. These hybrids were evaluated at two locations for MSR and one location for FSR with artificial inoculation. The hybrids differed significantly for FSR (p < 0.05), as was the general combining ability (GCA) effects (p < 0.01), while Specific combining ability (SCA) effects were found to be non-significant. The analysis of the trials under MSR, showed significant difference for GCA, SCA, GCA × environment (p < 0.01), and hybrid × environment (p < 0.05) while SCA × environment was non-significant. The Baker ratio, which shows the relative importance of GCA over SCA, was close to unity for both the stalk rots, and hence a predominant additive gene effect was inferred towards resistance to these diseases. Though the GCA × environment interaction was significant for MSR, this study identified lines and their cross combinations with high resistance and large GCA and SCA effects across environments for FSR and MSR This offers scope for source population improvement for resistance to these stalk rots, as well as developing maize hybrids with stable resistance to Post flowering stalk rot.

Item Type: Article
CRP: CGIAR Research Program on Maize
Uncontrolled Keywords: Post flowering stalk rots (PFSR); Fusarium stalk rot (FSR); Macrophomina stalk rot (MSR); General combining ability (GCA); Specific combining ability (SCA); Genetics; Genetic Analysis
Subjects: Others > Genetics and Genomics
Others > Maize
Others > Germplasm
Depositing User: Mr Ramesh K
Date Deposited: 28 Dec 2017 06:36
Last Modified: 12 Apr 2018 04:34
Official URL:
Acknowledgement: The authors gratefully acknowledge the financial support received from the CGIAR Research Program (CRP) on MAIZE for sponsoring this research work. The authors would like to thank Dr B.S Vivek, CIMMYT and S. Sitaraman, ICRISAT for reviewing the manuscript and providing useful comments. Authors would also like to acknowledge the technical assistance of M. Sofimiya, CIMMYT in carrying out this research work.
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