Methyl Jasmonate Affects O<SUB>3</SUB>-inhibition of Photosynthesis and Ascorbic Acid Content in Paddy Rice Grown at Different CO<SUB>2</SUB> Concentrations
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概要
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To evaluate the role of methyl jasmonate (MeJA) on ozone (O<SUB>3</SUB>: 0, 0.1, 0.3 cm<SUP>3</SUP> m<SUP>−3</SUP>; abbreviated respectively as O<SUP>0</SUP>, O<SUP>0.1</SUP> and O<SUP>0.3</SUP>)-induced photosynthetic inhibition of rice leaves at different atmospheric carbon dioxide (CO<SUB>2</SUB>) concentrations (400 and 800 cm<SUP>3</SUP> m<SUP>−3</SUP>; abbreviated respectively as C<SUP>400</SUP> and C<SUP>800</SUP>), MeJA solutions (0, 10, 100 μM; abbreviated respectively as M<SUP>0</SUP>, M<SUP>10</SUP>, and M<SUP>100</SUP>) were applied one day before acute exposure (5 h) of O<SUB>3</SUB>. Gas exchange, chlorophyll fluorescence and ascorbic acid were measured immediately before (BE), immediately after (AE-0), and 1 d and 3 d after (AE-1, AE-3) O<SUB>3</SUB> exposure. The net photosynthetic rate (<I>P</I><SUB>N</SUB>), and maximum (<I>F</I><SUB>v</SUB>/ <I>F</I><SUB>m</SUB>) and operating (<I>F</I><SUB>q</SUB>′/<I>F</I><SUB>m</SUB>′) quantum efficiencies of photosystem II (PSII) were decreased by O<SUB>3</SUB> exposure at AE-0. However, MeJA ameliorated the O<SUB>3</SUB>-inhibition of <I>F</I><SUB>v</SUB>/<I>F</I><SUB>m</SUB> and <I>F</I><SUB>q</SUB>′/<I>F</I><SUB>m</SUB>′ of PS II. Rapid recovery from O<SUB>3</SUB>-inhibition of <I>P</I><SUB>N</SUB> was observed as a result of MeJA application, but MeJA decreased the <I>P</I><SUB>N</SUB> and stomatal conductance (<I>g</I><SUB>s</SUB>) at AE-0. The O<SUB>3</SUB> decreased the total ascorbic acid content, although the MeJA increased it. The effects of MeJA on the O<SUB>3</SUB>-inhibition of PSII and ascorbic acid content at C<SUP>800</SUP> were less than at C<SUP>400</SUP>.
著者
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Imai Katsu
School Of Agriculture Meiji University
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Kobayakawa Hiroki
School Of Agriculture Meiji University
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