NDLI: Reversible photoinactivation of photosystem II during desiccation of barley (Hordeum vulgare L. cv. Albori) leaves in the light

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Journal of Plant Biology : Volume 47, Issue 1, March 2004

Journal of Plant Biology : Volume 46

Journal of Plant Biology : Volume 45

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Reversible photoinactivation of photosystem II during desiccation of barley (Hordeum vulgare L. cv. Albori) leaves in the light

Content Provider	Springer Nature Link
Author	Hwang, Hong Jin Kim, Eun Mi Rhew, Tae Hyong Lee, Choon Hwan
Copyright Year	2004
Abstract	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 μmol m$^{-2}$ s$^{-1}$, 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.
Starting Page	142
Ending Page	148
Page Count	7
File Format	PDF
ISSN	12269239
Journal	Journal of Plant Biology
Volume Number	47
Issue Number	2
e-ISSN	18670725
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	barley chlorophyll fluorescence desiccation phosphatase inhibitor photosystem II Plant Sciences Plant Breeding/Biotechnology Plant Genetics & Genomics Plant Systematics/Taxonomy/Biogeography Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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