NDLI: Photosynthetic regulation of C4 desert plant Haloxylon ammodendron under drought stress

Content Provider	Springer Nature Link
Author	Su, Peixi Cheng, Guodong Yan, Qiaodi Liu, Xinmin
Copyright Year	2007
Abstract	About 20-year-old desert plants of C4 species, Haloxylon ammodendron, growing at the southern edge of the Badain Jaran Desert in China, were selected to study the photosynthetic characteristics and changes in chlorophyll fluorescence when plants were subject to a normal arid environment (AE), moist atmospheric conditions during post-rain (PR), and the artificial supplement of soil water (SW). Results showed that under high radiation, in the AE, the species down-regulated its net assimilation rate (A) and maximum photochemical efficiency of PS II (Fv/Fm), indicating photoinhibition. However, under the PR and SW environments, A was up-regulated, with a unimodal diurnal course of A and a small diurnal change in Fv/Fm, suggesting no photoinhibition. When the air humidity or SW content was increased, the light compensation points were reduced; light saturation points were enhanced; while light saturated rate of CO2 assimilation (A max) and apparent quantum yield of CO2 assimilation (ΦC) increased. ΦC was higher while the A max was reduced under PR relative to the SW treatment. It was concluded that under high-radiation conditions drought stress causes photoinhibition of H. ammodendron. Increasing air humidity or soil moisture content can reduce photoinhibition and increase the efficiency of solar energy use.
Starting Page	139
Ending Page	147
Page Count	9
File Format	PDF
ISSN	01676903
Journal	Plant Growth Regulation
Volume Number	51
Issue Number	2
e-ISSN	15735087
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-01-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Desert plant Photoinhibition Photosynthesis down regulation Photochemical efficiency Drought stress Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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