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- W3147065113 abstract "The response of steady-state fluorescence (Fs) to irradiance in apple (Malus pumila Mill. cv.Tengmu No.1/Malus hupehensis Rehd.) leaf increased and decreased at light levels below and above 400mmol.m-2.s-1 photosynthetic photon flux density (PPFD), respectively, while the light-adapted maximalfluorescence (Fm') and minimal fluorescence (Fo') decreased constantly with the increasing PPFD, andthe closure of photosystem Ⅱ reaction center (PSⅡ RC) increased continuously, reflected by thechlorophyll fluorescence parameter of (Fs-Fo')/(Fm'-Fo'). These facts indicated that decrease of Fsabove 400 mmol.m-2.s-1 PPFD was not caused by closure of PSⅡ RC, but was mainly resulted from theprocess of light transfer from light-harvesting complexⅡ (LHCⅡ) to PSⅡ RC. In the presence of N-ethylmaleimide (NEM), an inhibitor of photosynthetic state transition, Fs kept on increasing in apple leaf atlight levels from 400 to 700 mmol.m-2.s-1, which was the photosynthetic saturation irradiance of appleleaves. In addition, Fs still increased at light levels over 700 mmol.m-2.s-1 in apple leaf pre-treated withdithiothreitol (DTT), an inhibitor of xanthophyll cycle. These changes showed that state transition andxanthophyll cycle caused a decrease of Fs in apple leaf at light levels below and above the photosyntheticsaturation irradiance, respectively. When apple leaf was pre-treated with NEM, the PSⅡ apparent rate ofphotochemical reaction (P-rate) and photochemical quenching (qP) decreased significantly in the lightrange of 600-800 mmol.m-2.s-1, but the non-photochemical quenching (qN) existed a small increase at600-800 mmol.m-2.s-1 and a decrease above 800 mmol.m-2.s-1. These phenomena suggested that statetransition was mainly a photochemical and a non-photochemical process in apple leaf responding to lightlower and higher than photosynthetic saturation irradiance, respectively." @default.
- W3147065113 created "2021-04-13" @default.
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- W3147065113 date "2003-01-01" @default.
- W3147065113 modified "2023-09-25" @default.
- W3147065113 title "State Transition, Is It a Photochemical or Non-photochemical Processin Leaf in Response to Irradiance?" @default.
- W3147065113 hasPublicationYear "2003" @default.
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