Genotype-by-Environment Interaction Effects under Heat Stress in Tropical Maize
Genotype-by-Environment Interaction Effects under Heat Stress in Tropical Maize
复制标题
热带玉米热应激下基因型与环境的相互作用效应
DOI：
10.3390/agronomy10121998
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
S. Mandal
中科院分区：
文献类型：
--
作者：
Vinayan Madhumal Thayil;P. H. Zaidi;K. Seetharam;Reshmi Rani Das;Sudarsanam Viswanadh;S. Ahmed;Mohammad Alamgir Miah;K. B. Koirala;M. Tripathi;M. Arshad;K. Pandey;R. Chaurasia;P. Kuchanur;A. Patil;S. Mandal
春玉米地区已成为南亚的一个利基市场。在这个雨季过后的季节，玉米的生产常常受到热应激的挑战。因此，纳入热胁迫抗逆性是本季节选用的玉米杂交种纳入的重要性状。然而，由于热胁迫下基因型与环境互作（GEI）效应显著，鉴定具有跨地域、跨年份稳定性能的玉米基因型是面临的主要挑战。在本研究中，我们试图确定导致GEI显著影响的关键天气变量，并确定在不同地点/年份热胁迫下表现稳定的玉米杂交种。该研究详细介绍了2015年、2016年和2017年春季在南亚热胁迫脆弱地区预发布的一组先进玉米杂交品种的评估情况。通过析因回归，我们发现相对湿度（RH）和蒸汽压差（VPD）是导致热胁迫下粮食产量GEI较大的两个最重要的环境协变量。研究还发现，从雄穗出苗期到灌浆期是最关键的作物阶段，对热胁迫敏感。跨地/年评价鉴定出6个高产耐热抗逆性杂交种。
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.