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

Agronomy

卷:10

Salahuddin Ahmed¹  Md.Alamgir Miah¹  ShyamS Mandal²  Kamal Pandey³  PH Zaidi⁴  S Viswanadh⁴  K Seetharam⁴  Vinayan MT⁴  Reshmi Rani Das⁴  Ramesh Chaurasia⁵  Mohammad Arshad⁶  KB Koirala⁷  MahendraPrasad Tripathi⁷  Prakash Kuchanur⁸  Ayyanagouda Patil⁸ 

[1] Bangladesh Agricultural Research Institute, Gazipur 1701, Bangladesh;

[2] Bihar Agricultural University, Sabour 813210, India;

[3] Corteva AgriScience Pvt. Ltd., Hyderabad 5000, India;

[4] International Maize and Wheat Improvement Center, c/o ICRISAT, Hyderabad 502324, India;

[5] Kaveri Seeds Pvt. Ltd., Hyderabad 5000, India;

[6] Maize and Millets Research Institute, Sahiwal 57000, Pakistan;

[7] National Maize Research Program, Rampur 44209, Nepal;

[8] University of Agricultural Sciences, Raichur 584101, India;

关键词: genotype × environment interaction;    heat stress;    maize;    yield;    climate change;    relative humidity;   

DOI  :  10.3390/agronomy10121998

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown