地球温暖化に向けたシソ科植物の高温適応メカニズムの解析

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  • ELUCIDATION OF THE HIGH-TEMPERATURE ADAPTIVEIVE MECHANISM OF LAMIACEAE PLANTS FOR APPLICATION TO GLOBAL WARMING

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Global warming is supposed to reduce crop productivity by high-temperature stress to plants. Therefore, elucidation of the adaptive mechanism of plants in this condition would be applied to keep crop productivity. In the previous study, I found that sweet basil (Ocimum basilicum) did not die even in 37 degree (a high-temperature condition), whereas, the same Lamiaceae plants of Perilla frutescens and sage (Salvia officinalis) died in 6 weeks. In this study, as the production of reactive oxygen species (ROS) in plant cells upon high-temperature stress has been known to damage plant growth, I focused on anti-oxidants substances that attenuate ROS. In the 37 degree condition, perilla and sage plants produced more ROS than that of 23 degree, whereas the amount of ROS production was similar in basil. After transfer to the high temperature condition, gene expression of basil CYP98, a rosmarinic acid synthesis gene was reduced although the amount of both rosmarinic acid and the total polyphenol substances was kept. On the other hand, basil gene expression of cAPX, a cytoplasmic ascorbate oxidase gene, and a heat-shock protein gene HSP70 increased 2 h after transfer to the 37 degree condition and recovery of the oxidation rate in ascorbic acid was faster in basil than in perilla and sage. These results suggested that the high ascorbic acid content as well as high activity to re-synthesize its reduced form could be a good candidate to adapt to the high temperature condition.

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