Maximum lethal temperature for flowering and seed set in maize with contrasting male and female flower sensitivities,Journal of Agronomy and Crop Science

当前位置： X-MOL 学术 › J. Agron. Crop Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Maximum lethal temperature for flowering and seed set in maize with contrasting male and female flower sensitivities
Journal of Agronomy and Crop Science ( IF 3.5 ) Pub Date : 2021-06-02 , DOI: 10.1111/jac.12506
Yuanyuan Wang ₁ , Xiaoli Liu ₁ , Xinfang Hou ₁ , Dechang Sheng ₁ , Xin Dong ₂ , Yingbo Gao ₃ , Pu Wang ₁ , Shoubing Huang ₁

Affiliation

With a warming climate, heat events occur more frequently especially during flowering of many crops which increasingly threatens food security. The maximum temperature thresholds (TTmax) for different flowering processes and kernel formation, however, are not explicit in maize (Zea mays L.). For this, a temperature-controlled experiment was conducted including two maize hybrids ZD958 and XY335 that were widely grown in China and six temperature levels (maximum/minimum temperature; 30/20, 32/22, 34/24, 36/26, 38/28 and 40/30℃ for 14 consecutive days bracketing the silking stage). Both tasseling and pollen shedding time were advanced with elevated temperature, but silking time was advanced from 30/20 to 36/26℃ and then delayed with further temperature increase, thus extending anthesis–silking interval (ASI). Silking rate was significantly reduced to 63% at 40/30℃ for ZD958 but maintained at 88%–95% for XY335 compared to that at 30/20℃. Pollen shed weight and pollen viability decreased with elevated temperature with larger reductions in XY335 than in ZD958. Hence, ZD958 and XY335 are female and male flower sensitive hybrids, respectively. Silking rate, pollen shed number and ASI were the most important constraints to kernel formation under HT stress. TTmax for seed set of both hybrids were estimated to be ~38℃, and different flowering processes have respective TTmax. These detailed information are important to uncover heat impacts on maize and increase simulation accuracy when modelling heat effects on maize yield. Besides, more attentions need to be directed at female flower sensitivity when breeding and/or selecting heat-tolerant maize hybrids.

更新日期：2021-07-24

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>