Photorespiration Rate in Mungbean (Vigna radiata (L.) Wilczek) Leaves - A further estimation from the quantum yield at photosystem Ⅱ-.
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Photorespiration rates (PR) in peeled (PL, without epidermis) and nonpecled (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 (k_1) of electron equivalents required to produce 9 mol adenosine 5'-triphosphate (ATP) for fixing 1 mol CO_2 was experimentally determined 4.62. Also the number (k_2) of electrons required for releasing 1 mol CO_2 in photorespiration was estimated 7.44 or 9.49 on the assumption that 14.5 or 18.5mol ATP was consumed for 1 mol CO_2 releasing, respectively. The simultaneous equations were constructed with the parameters of k_1, k_2 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 k=7.44 or 9.49 in a light intensity of 300μmol 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 PH as compared with the PR obtained by the subtraction method (PR=Pg measured in 2% [O_2] airPg measured in 2% [O_2] air).
収録刊行物
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- Journal of the Faculty of Agriculture, Kyushu University
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Journal of the Faculty of Agriculture, Kyushu University 44 (1/2), 67-72, 1999-11
九州大学大学院農学研究院
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詳細情報 詳細情報について
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- CRID
- 1390290699660734208
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- NII論文ID
- 110000018000
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- NII書誌ID
- AA00247166
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- DOI
- 10.5109/24307
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- HANDLE
- 2324/24307
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- ISSN
- 00236152
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- 本文言語コード
- en
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- データソース種別
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- IRDB
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