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Open AccessArticle

Genotype-by-Environment Interaction Effects under Heat Stress in Tropical Maize

1
International Maize and Wheat Improvement Center, c/o ICRISAT, Hyderabad 502324, India
2
Bangladesh Agricultural Research Institute, Gazipur 1701, Bangladesh
3
National Maize Research Program, Rampur 44209, Nepal
4
Maize and Millets Research Institute, Sahiwal 57000, Pakistan
5
Corteva AgriScience Pvt. Ltd., Hyderabad 500082, India
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Kaveri Seeds Pvt. Ltd., Hyderabad 500003, India
7
University of Agricultural Sciences, Raichur 584101, India
8
Bihar Agricultural University, Sabour 813210, India
*
Authors to whom correspondence should be addressed.
Agronomy 2020, 10(12), 1998; https://doi.org/10.3390/agronomy10121998
Received: 23 November 2020 / Revised: 15 December 2020 / Accepted: 16 December 2020 / Published: 19 December 2020
(This article belongs to the Special Issue Drought and Heat Stress Regulation on Crop Development and Yield)
Spring maize area has emerged as a niche market in South Asia. Production of maize during this post-rainy season is often challenged due to heat stress. Therefore, incorporating heat stress resilience is an important trait for incorporation in maize hybrids selected for deployment in this season. However, due to the significant genotype × environment interaction (GEI) effects under heat stress, the major challenge lies in identifying maize genotypes with improved stable performance across locations and years. In the present study, we attempted to identify the key weather variables responsible for significant GEI effects, and identify maize hybrids with stable performance under heat stress across locations/years. The study details the evaluation of a set of prereleased advanced maize hybrids across heat stress vulnerable locations in South Asia during the spring seasons of 2015, 2016 and 2017. Using factorial regression, we identified that relative humidity (RH) and vapor pressure deficit (VPD) as the two most important environmental covariates contributing to the large GEI observed on grain yield under heat stress. The study also identified reproductive stage, starting from tassel emergence to early grain-filling stage, as the most critical crop stage highly susceptible to heat stress. Across-site/year evaluation resulted in identification of six high yielding heat stress resilient hybrids. View Full-Text
Keywords: genotype × environment interaction; heat stress; maize; yield; climate change; relative humidity; vapor pressure deficit; target population of environments genotype × environment interaction; heat stress; maize; yield; climate change; relative humidity; vapor pressure deficit; target population of environments
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MDPI and ACS Style

Madhumal Thayil, V.; Zaidi, P.H.; Seetharam, K.; Rani Das, R.; Viswanadh, S.; Ahmed, S.; Miah, M.A.; Koirala, K.B.; Tripathi, M.P.; Arshad, M.; Pandey, K.; Chaurasia, R.; Kuchanur, P.H.; Patil, A.; Mandal, S.S. Genotype-by-Environment Interaction Effects under Heat Stress in Tropical Maize. Agronomy 2020, 10, 1998. https://doi.org/10.3390/agronomy10121998

AMA Style

Madhumal Thayil V, Zaidi PH, Seetharam K, Rani Das R, Viswanadh S, Ahmed S, Miah MA, Koirala KB, Tripathi MP, Arshad M, Pandey K, Chaurasia R, Kuchanur PH, Patil A, Mandal SS. Genotype-by-Environment Interaction Effects under Heat Stress in Tropical Maize. Agronomy. 2020; 10(12):1998. https://doi.org/10.3390/agronomy10121998

Chicago/Turabian Style

Madhumal Thayil, Vinayan; Zaidi, Pervez H.; Seetharam, Kaliyamoorthy; Rani Das, Reshmi; Viswanadh, Sudarsanam; Ahmed, Salahuddin; Miah, Mohammad A.; Koirala, Kesab B.; Tripathi, Mahendra P.; Arshad, Mohammad; Pandey, Kamal; Chaurasia, Ramesh; Kuchanur, Prakash H.; Patil, Ayyanagouda; Mandal, Shyam S. 2020. "Genotype-by-Environment Interaction Effects under Heat Stress in Tropical Maize" Agronomy 10, no. 12: 1998. https://doi.org/10.3390/agronomy10121998

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