Effects of temperature stress on the accumulation of ascorbic acid and folates in sweet corn (Zea mays L.) seedlings
文献类型： 外文期刊
作者： Xiang, Nan 1 ; Hu, Jianguang 2 ; Wen, Tianxiang 2 ; Brennan, Margaret Anne 3 ; Brennan, Charles Stephen 1 ; Guo, Xi 1 ;
作者机构： 1.South China Univ Technol, Sch Food Sci & Engn, Overseas Expertise Intro Ctr Discipline Innovat F, Ctr 111, Guangzhou 510640, Guangdong, Peoples R China
2.Guangdong Acad Agr Sci, Key Lab Crops Genet Improvement Guangdong Prov, Crop Res Inst, Guangzhou, Guangdong, Peoples R China
3.Lincoln Univ, Dept Wine Food Mol Biosci, Lincoln, New Zealand
关键词： gene expression; temperature stress; sweet corn; ascorbic acid; folates
期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE （ 影响因子：3.638； 五年影响因子：3.802 ）
ISSN： 0022-5142
年卷期：
页码：
收录情况： SCI
摘要： BACKGROUND Extreme temperatures are among the primary abiotic stresses that affect plant growth and development. Ascorbic acid (AsA) is an efficient antioxidant for scavenging relative oxygen species accumulated under stress. Folates play a significant role in DNA synthesis and protect plants against oxidative stress. Sweet corn (Zea mays L.), a crop grown worldwide, is sensitive to extreme temperatures at seedling stage, which may cause yield loss. This study was conducted to explore the biosynthetic regulative mechanism of AsA and folates in sweet corn seedlings under temperature stress. RESULTS The AsA and folate composition and relative gene expression in sweet corn seedlings grown under different temperature stresses (10, 25, and 40 degrees C) were evaluated. The imposition of temperature stress altered the AsA content mainly by modulating the expression of (Zm)DHAR, whose encoded enzyme dehydroascorbic reductase (DHAR) is essential in the AsA recycle pathway. Low temperature stress raised the expressions of relative genes, leading to folate accumulation. High temperature stress modulated the folate content by influencing the expression of the correspondence gene for aminodeoxychorismate synthase, (Zm)ADCS, as well as downstream genes that connected with DNA methylation. CONCLUSION These results provided a theoretical basis, at a genetic level, for understanding the stress responses mechanism in sweet corn seedlings, offering guidance for sweet corn cultivation. (c) 2019 Society of Chemical Industry
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