Photoinhibition of photosystem (PS) Ⅱ was induced in primary leaves of 25 day-old peppers grown 100 μ㏖·m^-2·s^-1, at 25℃. The modulation of PSⅡ functionality in vivo was induced by varying both irradiance (0-3000 μ㏖·m^-2·s^-1) and dura...
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https://www.riss.kr/link?id=A19695389
1995
-
400
SCOPUS,KCI등재,SCIE
학술저널
373-380(8쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
Photoinhibition of photosystem (PS) Ⅱ was induced in primary leaves of 25 day-old peppers grown 100 μ㏖·m^-2·s^-1, at 25℃. The modulation of PSⅡ functionality in vivo was induced by varying both irradiance (0-3000 μ㏖·m^-2·s^-1) and dura...
Photoinhibition of photosystem (PS) Ⅱ was induced in primary leaves of 25 day-old peppers grown 100 μ㏖·m^-2·s^-1, at 25℃. The modulation of PSⅡ functionality in vivo was induced by varying both irradiance (0-3000 μ㏖·m^-2·s^-1) and duration (0-70 min) of light treatment. The functionality of PSⅡ was investigated in terms of photochemical efficiency of PSⅡ (Fv/Fm) and quantum yield of O_2 evolution, and expressed as a function of photon exposure [㏖ photons·m^-2, the product of irradiance and duration of light treatment (Bell and Rose, 1981)]. Contrary to the linear decline of Fv/Fm ratio showing 50% decreases by absorption of 10 ㏖ photons·m^-2, quantum yield of O_2 evolution decreased biphasically with increasing photon exposure, showing 50% decreases by absorption of 5.5 ㏖ photons·m^-2. Treatment of low temperature at 15℃ for 30 min alone did not affect the functionality of PSⅡ, but high temperature (45℃) significantly inactivated PSⅡ activity. However, when leaves of pepper were subjected to low or high temperature in the presence of light, PSⅡ was substantially photoinactivated. These results suggest the presence of different photoinhibitory mechanisms at low and high temperature.
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