2023-10-11 イリノイ大学アーバナ・シャンペーン校
◆このSIFを用いた研究は、光合成のダイナミクスを調査するために役立ち、二酸化炭素濃度や気温が植物に与える影響を評価するのに使われてきました。今回、イリノイ大学と米国農業研究局のチームは、SIFを用いてオゾンの上昇が大豆に及ぼす効果を測定し、その結果を「Journal of Experimental Botany」に発表しました。
＜関連情報＞
- https://aces.illinois.edu/news/illinois-researchers-prove-new-method-measure-ozone-stress-soybeans
- https://academic.oup.com/jxb/advance-article-abstract/doi/10.1093/jxb/erad356/7272702
太陽誘起クロロフィル蛍光が、ダイズのキャノピー構造と老化促進に対するオゾン上昇の影響を捉える Solar-induced chlorophyll fluorescence captures the effects of elevated ozone on canopy structure and acceleration of senescence in soybean
Genghong Wu, Kaiyu Guan, Elizabeth A Ainsworth, Duncan G Martin, Hyungsuk Kimm, Xi Yang
Journal of Experimental Botany Published:13 September 2023
DOI:https://doi.org/10.1093/jxb/erad356
Abstract
Solar-induced chlorophyll fluorescence (SIF) provides an opportunity to rapidly and non-destructively investigate how plants respond to stress. Here, we explored the potential of SIF to detect the effects of elevated O3 on soybean in the field where soybean was subjected to ambient and elevated O3 throughout the growing season in 2021. Exposure to elevated O3 resulted in a significant decrease in canopy SIF at 760 nm (SIF760), with a larger decrease in the late growing season (36%) compared with the middle growing season (13%). Elevated O3 significantly decreased the fraction of absorbed photosynthetically active radiation by 8–15% in the middle growing season and by 35% in the late growing stage. SIF760 escape ratio (fesc) was significantly increased under elevated O3 by 5–12% in the late growth stage due to a decrease of leaf chlorophyll content and leaf area index. Fluorescence yield of the canopy was reduced by 5–11% in the late growing season depending on the fesc estimation method, during which leaf maximum carboxylation rate and maximum electron transport were significantly reduced by 29% and 20% under elevated O3. These results demonstrated that SIF could capture the elevated O3 effect on canopy structure and acceleration of senescence in soybean and provide empirical support for using SIF for soybean stress detection and phenotyping.
