Photosystem‐II Activity Is Decreased by Yellowing of Barley Primary Leaves during Growth in Elevated Carbon Dioxide
Photosystem‐II Activity Is Decreased by Yellowing of Barley Primary Leaves during Growth in Elevated Carbon Dioxide
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在二氧化碳浓度升高的情况下，大麦初生叶变黄会降低光系统 II 的活性
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
R. Sicher
中科院分区：
文献类型：
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作者：
R. Sicher
Leaf yellowing was studied in 10–18‐d‐old barley seedlings (Hordeum vulgare L. cv. Brant) grown at ambient (38 Pa) and at elevated (68, 100, and 140 Pa) CO2 partial pressures in controlled‐environment chambers. Maximal total chlorophyll (Chl) concentrations of primary leaves from all four CO2 growth treatments were
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$$0.36\pm 0.01$$
\end{document} g m−2, and these concentrations were observed 10–12 d after sowing (DAS). Total Chl levels in primary leaves were 35%, 64%, and 78% below maximal levels in the 38, 68, and 100 Pa CO2 growth treatments, respectively, when measured 18 DAS. Losses of Chl in 18‐d‐old primary leaves were similar in the 100 and 140 Pa CO2 treatments. Decreases of Chl a and Chl b in response to CO2 enrichment were comparable in isolated chloroplast preparations and in intact 18‐d‐old barley primary leaves of plants grown at 38 and 68 Pa CO2. Total thylakoid membrane proteins, the Chl a/b binding protein (LHC‐II), and D1 protein levels were also lower in chloroplast preparations from plants grown in the elevated compared to the ambient CO2 treatment. Both ferricyanide reduction and whole‐chain electron‐transport rates (H2O → methylviologen) were significantly lower for chloroplasts from plants grown at 68 Pa CO2 compared with those grown at 38 Pa CO2. However, photosystem‐I‐dependent chloroplast photoreductions did not differ between CO2 treatments. The results indicated that the CO2‐dependent yellowing of barley primary leaves adversely affected photosystem‐II activity. Growth in elevated CO2 may have increased the susceptibility of photosystem‐II to light damage.
Leaf yellowing was studied in 10–18‐d‐old barley seedlings (Hordeum vulgare L. cv. Brant) grown at ambient (38 Pa) and at elevated (68, 100, and 140 Pa) CO2 partial pressures in controlled‐environment chambers. Maximal total chlorophyll (Chl) concentrations of primary leaves from all four CO2 growth treatments were
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$$0.36\pm 0.01$$
\end{document} g m−2, and these concentrations were observed 10–12 d after sowing (DAS). Total Chl levels in primary leaves were 35%, 64%, and 78% below maximal levels in the 38, 68, and 100 Pa CO2 growth treatments, respectively, when measured 18 DAS. Losses of Chl in 18‐d‐old primary leaves were similar in the 100 and 140 Pa CO2 treatments. Decreases of Chl a and Chl b in response to CO2 enrichment were comparable in isolated chloroplast preparations and in intact 18‐d‐old barley primary leaves of plants grown at 38 and 68 Pa CO2. Total thylakoid membrane proteins, the Chl a/b binding protein (LHC‐II), and D1 protein levels were also lower in chloroplast preparations from plants grown in the elevated compared to the ambient CO2 treatment. Both ferricyanide reduction and whole‐chain electron‐transport rates (H2O → methylviologen) were significantly lower for chloroplasts from plants grown at 68 Pa CO2 compared with those grown at 38 Pa CO2. However, photosystem‐I‐dependent chloroplast photoreductions did not differ between CO2 treatments. The results indicated that the CO2‐dependent yellowing of barley primary leaves adversely affected photosystem‐II activity. Growth in elevated CO2 may have increased the susceptibility of photosystem‐II to light damage.