| 核黄素参与水稻非生物胁迫响应的分析 |
| 投稿时间：2022-11-04 修订日期：2023-04-25 点此下载全文 |
| 引用本文：夏清珊,周正琨,谭炎宁,等.核黄素参与水稻非生物胁迫响应的分析[J].西北植物学报,2023,43(8):1314~1322 |
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| 基金项目:国家自然科学基金资助项目(32272139,31871595)；湖南省自然科学基金资助项目(2020JJ4004)；杂交水稻国家重点实验室(湖南杂交水稻研究中心)开放课题(2019KF02)；海南省崖州湾种子实验室揭榜挂帅项目(B21HJ0108)。 |
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| 中文摘要:核黄素参与了生物体内许多生化过程,但其对植物非生物胁迫响应的影响仍知之甚少。为探究核黄素在水稻中非生物胁迫响应中的作用,以粳稻Kitaake和籼稻T98B为实验材料,考察了核黄素对2种材料的盐、高温、渗透、碱和氧化等胁迫响应的影响,重点测定了盐和高温胁迫下水稻体内核黄素合成基因的表达和相关生理指标。结果发现：(1)施加外源核黄素有效提高了水稻的盐和高温胁迫耐受性,降低了渗透胁迫耐受性,而其氧化和碱胁迫耐受性不受影响。(2)逆境胁迫均不同程度地促进了核黄素在水稻中的积累,尤其盐和高温胁迫促进效果最明显。(3)盐和高温胁迫均诱导了核黄素合成酶基因的表达,促进了核黄素的生物合成,改善了水稻的胁迫耐受性。这些研究结果表明,非生物逆境能促进核黄素在水稻体内的合成和积累,核黄素也能提高水稻盐和高温胁迫的耐受性,而降低其渗透胁迫耐受性。 |
| 中文关键词:核黄素 水稻 非生物胁迫 幼苗生长 |
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| Analysis of Riboflavin Involvement in Abiotic Stress Response in Rice |
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| Abstract:Riboflavin is involved in many biochemical processes in organisms,but its effects on abiotic stress responses are still poorly understood in plants. To explore the role of riboflavin in response to abiotic stress in rice (Oryza sativa L.), a japonica rice Kitaake and an indica rice T98B were used as experimental materials to investigate the effects of riboflavin on their response to salt, high temperature,osmotic,alkali, and oxidative stresses. The expression levels of riboflavin biosynthesis genes and stress related physiological indexes were determined intensively in rice under salt and high temperature stresses. The results demonstrated that: (1) Exogenous riboflavin effectively enhanced the tolerance to salt and high temperature stresses, and reduced the tolerance to osmotic stress, but did not affect the tolerance to oxidative and alkali stresses. (2) All the abiotic stresses, especially salt and high temperature, promoted the accumulation of riboflavin to different degrees in rice. (3) Both salt and high temperature stresses induced the expression of riboflavin biosynthesis genes, which promoted the biosynthesis of riboflavin and improved the stress tolerance in rice. These results indicate that abiotic stress can promote the biosynthesis and accumulation of riboflavin in rice,and riboflavin can also enhance the tolerance to salt and high temperature stresses but reduce the tolerance to osmotic stress. |
| keywords:riboflavin rice abiotic stress seedling growth |
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