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Relationship Between PSⅡ excitation pressure and Content of Rubisco Large Subunit or Small Subunit in Flag Leaf of Super High-Yielding Hybrid Rice

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Acta Botanica Sinica 2003年第8期45卷 929-935页

作者：欧志英彭长连林桂珠阳成伟中国科学院华南植物研究所广州510650

The changes in photochemical features of Photosystem Ⅱ (PS Ⅱ) and contents of Rubisco large subunit (RLS) and small subunit (RSS) in flag leaf from 75DAS to 113DAS (from filling to harvesting stages) were investigated in two hybrid rices (Oryza sativa L) cv. Liangyoupeijiu and cv. Shanyou 63 grown in the field. Liangyoupeijiu is a super high-yielding rice and Shanyou 63 has widely been planted in China in these years. The results indicate that soluble protein and chlorophyll in both cultivars degraded slowly at first and dramatically thereafter. The degradation speed of soluble protein in Shanyou 63 was faster than that in Liangyoupeijiu. Both Fv/Fm and qP decreased in parallel with leaf senescence, whereas qN fell at first and then rose. No significant change in excitation pressure (1-qP) was found before 89DAS but a sharply increase in both cultivars after it occurred. excitation pressure rose more rapidly in Shanyou 63 than that in Liangyoupeijiu. The changes of RLS and RSS content exhibited the same trend as that of soluble protein content. A better linear correlation between RLS, RSS degradation and elevation of (1-qP) were shown in both cultivars. We suggest that the increase in PSⅡ excitation pressure possibly induced the quick senescence process in rice flag leaf. The high-yielding of Liangyoupeijiu may be due to its maintenance of stronger photosynthetic capacity, longer and more stable photosynthetic functional du-ration than that of Shanyou 63.

关键词： excitation pressure rice flag leaf Rubisco senescence

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Photosynthetic excitation pressure Causes Violaxanthin De-epoxidation in Aging Cabbage （Brassica Oleracea L.） Leaves

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Journal of Life Sciences 2011年第3期5卷 182-191页

作者： Amarendra Narayan Misra Dariusz Latowski Kazimierz Strzalka Department of Biosciences and Biotechnology School of Biotechnology Fakir Mohan University Balasore 756019 India Faculty of Biochemistry Biophysics and Biotechnology Jagiellonian University Krakow 30-387 Poland

The purpose of the present studies was analysis of the age induced changes in photochemical efficiency and xanthophyils cycle pigments of the primary cabbage （Brassica oleracea L. cv. Capitata f. alba） leaves. Photochemical efficiency of photosystem Ⅱ （PS Ⅱ） was studied by a pulse amplitude modulated chlorophyll fluorescence apparatus, chlorophyll concentration was analysis spectrophotometrically and xanthophyll cycle pigments were estimated by high-pressure liquid chromatography （HPLC）. Leaf senescence was accompanied with a decrease both in chlorophylls concentration, the photochemical efficiency and rate constant for PS Ⅱ photochemistry whereas non-photochemical parameters increased. excitation pressure （1-qP） which is a measure of relative lumen acidification increased by 1.2x in aging leaves. The maximum quantum yield of PS Ⅱ showed no significant change. The level of de-epoxidised xanthophylls increased but the concentration of mono- and di-epoxy xanthophylls decreased in aging leaves. A linear relationship between the excitation pressure and the depoxidation state of the xanthophyll cycle pigments and lutein, during the onset of senescence suggests that excitation pressure can be used as a sensor for monitoring the onset of senescence as well for the de-epoxidation state of the xanthophylls responsible for non-photochemical quenching in stressed leaves.

关键词： Cabbage (Brassica oleracea L.) violaxanthin cycle excitation pressure senescence photosynthetic parameters.

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