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- W2355831421 abstract "The glutathione-ascorbate cycle and photoinhibition in rice (Oryza sativa cv. Xiangaiyou)leaves under the field condition or with photoinhibitory treatment were examined. The re- sults shown that in clear day in summer, photosynthetic CO_2 fixation rate in rice leaves was depressed at noon (termed as midday depression) and was partially reversed in the afternoon. Apparent quantum re- quirement in rice leaves increased largely at noon in a clear day. indicating midday depressionwas related to photo-inhibition. Glutathione content in rice leaves was raised from ca 150 nmol·g~(-1)FW in the morn- ing to ca 300 nmol·g~(-1)FW at noon in a clear day. More particularly, a nearly two-fold increase in glutathione reductase activity was detected. Ascorbate content as well as dehydroascorbate reductase and ascorbate peroxidase activities remained relatively constant during the whole day. It was also found within 30 min of photoinhibitory treatment, glutathione content and glutathione reductase activity increased respectively about 40% and 70%, whereas no obvious increase both in ascorbate content and in dehydroascorbate reductase and ascorbate peroxidase activities was monitored. Furthermore, a rapid re- sponses of glutathione-ascorbate cycle, characterized by dramatic increase of glutathione content and glutathione reductase activity, to aminotriazole was observed. It was concluded that glutathione content and glutathione reductase activity are the limiting factors for stimulated glutathione-ascorbate cycle, which is probably important for C_3 plants to alleviate photoinhibition." @default.
- W2355831421 created "2016-06-24" @default.
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- W2355831421 date "1992-01-01" @default.
- W2355831421 modified "2023-09-26" @default.
- W2355831421 title "Responese of Glutathione--ascorbate Cycle in Rice Leaves to Photoinhibition" @default.
- W2355831421 hasPublicationYear "1992" @default.
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