Photorespiration Rate in Mungbean (Vigna radiata (L.) Wilczek) Leaves - A further estimation from the quantum yield at photosystem II

Kenji Hirao, Fumitake Kubota, Yasuyuki Yoshimura, Shinji Tokuda, Kazuyuki Saitou

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

Photorespiration rates (PR) in peeled (PL, without epidermis) and nonpeeled (NL) leaves of mungbean (Vigna radiata (L.) Wilczek) were estimated from electron transport situations at photosystem II using the chlorophyll fluorescence quenching diagnosis. The number (k1) of electron equivalents required to produce 9 mol adenosine 5′-triphosphate (ATP) for fixing 1 mol CO2 was experimentally determined 4.62. Also the number (k2) of electrons required for releasing 1 mol CO2 in photorespiration was estimated 7.44 or 9.49 on the assumption that 14.5 or 18.5 mol ATP was consumed for 1 mol CO2 releasing, respectively. The simultaneous equations were constructed with the parameters of k1, k2 and related elements to calculate PR, and the mutual relationships in energy balance among PR, gross photosynthetic rate (Pg), total photosynthetic rate (TC, TC = PR+Pg) and PR ratio (PR/TC) were discussed. The value of PR, 1.75 or 2.05 μmol m-2 s-1, in PL was estimated corresponding to k2 = 7.44 or 9.49 in a light intensity of 300 μmol m-2 s-1 PPFD, and PR/TC was 18.2 or 20.6%, respectively. The estimation by chlorophyll fluorescence quenching diagnosis may give a more reasonable value of PR as compared with the PR obtained by the subtraction method (PR = Pg measured in 2% [O2] air -Pg measured in 2% [O2] air).

本文言語英語
ページ(範囲)67-72
ページ数6
ジャーナルJournal of the Faculty of Agriculture, Kyushu University
44
1-2
DOI
出版ステータス出版済み - 11月 1999

!!!All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 農業および作物学

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