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논문 기본 정보

자료유형
학술저널
저자정보
Hwang, Hong-Jin (Department of Molecular Biology, Pusan National University) Kim, Eun-Mi (Department of Biology, Pusan National University) Rhew, Tae-Hyong (Department of Biology, Pusan National University) Lee, Choon-Hwan (Department of Molecular Biology, Pusan National University)
저널정보
한국식물학회 식물학회지 식물학회지 제47권 제2호
발행연도
2004.1
수록면
142 - 148 (7page)

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We investigated the inherent protective mechanisms against stress and damage to photosystem II (PSII) in barley (Hordeum vulgare L. cv. Albori). Leaves were desiccated at 30% relative humidity, under either low or high light (photon flux densities of 100 or 300 $\mu$mol $m^{-2}$ $s^{-l}$, respectively). During the treatment period, relative water content dropped to 35 to 45%, depending on light intensity. However, the photochemical efficiency of PSII (Fv/Fm) decreased only about 10%. This relatively stable response was due to the rapid, reversible increase in Fm (maximum fluorescence) during 20 min of dark-adaptation. During desiccation in the light, however, PSII was photo-inactivated by non-photochemical quenching (NPQ), with the excess excitation energy absorbed by the chlorophyll being dissipated as heat energy. This decline in NPQ in the first 2 min of treatment was caused by a relaxation in the energy-dependent quenching during dark-adaptation, but could be delayed significantly by a phosphatase inhibitor, NaF. In addition, the relaxation of other NPQ components related to state transition and phosphorylation of thylakoid phosphoproteins were blocked by NaF.F.

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