花后夜间高温胁迫影响田间种植玉米的生理机能和淀粉代谢

IF 1.3 Q3 AGRONOMY Agrosystems, Geosciences & Environment Pub Date : 2024-06-27 DOI:10.1002/agg2.20522
Nathan T. Hein, Manish Tiwari, Ritesh Kumar, Landon Cook, Troy Ostmeyer, Impa M. Somayanda, James R. Ross, Habtamu Ayalew, Dan Wagner, Mitchell L. Neilsen, S. V. Krishna Jagadish
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引用次数: 0

摘要

全球日平均最低气温的增长速度快于日平均最高气温的增长速度,预计日平均最高气温的严重程度将增加,从而影响全球粮食生产。本研究利用独特的田间基础设施,重点阐明了 12 个美国商业玉米(Zea mays)杂交种对夜间高温(HNT)胁迫的生理和转录反应。我们的实验目标是:(i) 施加精确且均匀分布的 +4.0°C 花后 HNT 胁迫,直至生理成熟;(ii) 量化 HNT 胁迫对生理和产量相关性状的影响;(iii) 确定在 HNT 胁迫下形成的玉米籽粒对最终使用质量的影响;(iv) 分析参与籽粒淀粉代谢的基因的差异表达。在整个籽粒灌浆期,精确且均匀分布的 HNT 胁迫温度比夜间环境温度高 3.8°C,这降低了易感杂交种的产量(-14%)和籽粒重量(-8%),并显著降低了籽粒养分含量,特别是镁含量。在耐受 HNT 的杂交种中,参与淀粉代谢的关键基因的表达量明显增加。虽然 HNT 胁迫对田间种植玉米的产量和质量有负面影响,但两个杂交种的生理和转录调控有利于提高抗逆性,这为开发气候智能型玉米杂交种奠定了平台。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Post-flowering high night-time temperature stress impacts physiology and starch metabolism in field-grown maize

The global average daily minimum temperatures are increasing at a quicker pace than the average daily maximum temperatures, which are predicted to increase in severity impacting global food production. This study focuses on elucidating the physiological and transcriptional response to high night-time temperature (HNT) stress in 12 US commercial maize (Zea mays) hybrids using unique field-based infrastructure. Our experimental objectives were to (i) impose an accurate and uniformly distributed post-flowering HNT stress of +4.0°C until physiological maturity, (ii) quantify the impact of HNT stress on physiological and yield-related traits, (iii) establish the impact on end-use quality of maize kernels formed under HNT stress, and (iv) analyze the differential expression of genes involved in grain starch metabolism. Accurate and uniformly distributed HNT stress of 3.8°C higher than the ambient night-time temperature throughout the grain-filling period reduced yield (−14%), kernel weight (−8%), and significantly reduced kernel nutrient content, specifically magnesium in the susceptible hybrids. HNT significantly increased the expression of key genes involved in starch metabolism in the tolerant hybrid. Although HNT stress had a negative impact on yield and quality in field grown maize, two hybrids had physiological and transcriptional regulation that favored higher level of resilience which lays the platform for developing climate smart maize hybrids.

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来源期刊
Agrosystems, Geosciences & Environment
Agrosystems, Geosciences & Environment Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
80
审稿时长
24 weeks
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