NDLI: Photoprotective function of photorespiration in Reaumuria soongorica during different levels of drought stress in natural high irradiance

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Photosynthetica : Volume 46, Issue 1, March 2008

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Photoprotective function of photorespiration in Reaumuria soongorica during different levels of drought stress in natural high irradiance

Content Provider	Springer Nature Link
Author	Bai, J. Xu, D. H. Kang, H. M. Chen, K. Wang, G.
Copyright Year	2008
Abstract	Diurnal patterns of gas exchange and chlorophyll (Chl) fluorescence parameters of photosystem 2 (PS2) as well as H$_{2}$O$_{2}$ content were analyzed in Reaumuria soongorica (Pall.) Maxim., a perennial semi-shrub. The rate of photorespiration was estimated by combined measurement of gas exchange and Chl fluorescence. The rate of photorespiration increased with the increasing drought stress (DS). The ratio of carboxylation electron flow to oxygenation electron flow (J$_{c}$/J$_{o}$) and the maximal photochemical efficiency of PS2 (variable to maximum fluorescence ratio, F$_{v}$/F$_{m}$) decreased with the increasing DS. F$_{v}$/F$_{m}$ in isonicotinic acid hydrazide (INH)-sprayed plants was lower than that in normal plants under moderate DS, but no significant difference was observed under severe DS. H$_{2}$O$_{2}$ content in INH-sprayed plants was significantly lower than that in normal plants under severe DS. Taken together, photorespiration in R. soongorica consumed excess electrons and protected photosynthetic apparatus under moderate DS, whereas it accelerated H$_{2}$O$_{2}$ accumulation markedly and induced the leaf abscission under severe DS.
Starting Page	232
Ending Page	237
Page Count	6
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	46
Issue Number	2
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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Photoprotective function of photorespiration in Reaumuria soongorica during different levels of drought stress in natural high irradiance

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