NDLI: Changes in leaf gas exchange and biomass of Eucalyptus camaldulensis in response to increasing drought stress induced by polyethylene glycol

Content Provider	Springer Nature Link
Author	Utkhao, Winai Yingjajaval, Suntaree
Copyright Year	2015
Abstract	Under increasing short-term drought stress, E. camaldulensis plantlets showed reduced stomatal conductance, then decreased carboxylation efficiency, and finally, reduced quantum efficiency of photosynthesis and chlorophyll content. We evaluated the physiological responses of a drought-tolerant (DT) clone and a drought-sensitive (DS) clone of Eucalyptus camaldulensis to drought stress. We evaluated leaf gas exchange, chlorophyll fluorescence, chlorophyll content, and biomass of 4-month-old eucalyptus plantlets during a graduated series of drought stress treatments over 24 days. The plantlets were grown in half-strength Hoagland’s solution, and drought stress was imposed by adding polyethylene glycol (PEG 6000) to the nutrient solution. The plantlets were subjected to three stepwise levels of drought stress, each 8 days long. The osmotic potential of the nutrient solution was −70, −140, and −280 kPa under mild, moderate, and severe drought stress, respectively. Compared with unstressed plantlets, the drought-stressed plantlets of both clones showed significant decreases in leaf gas exchange, chlorophyll fluorescence parameters, and biomass accumulation. The limitation of photosynthesis under mild drought stress was mainly because of reduced stomatal conductance. The reduction in the photosynthetic rate (P n ) under moderate to severe drought stress was because of both stomatal and non-stomatal limitation; that is stomatal closure, reduced carboxylation efficiency, reduced quantum efficiency, and decreased chlorophyll content. Both clones used stomatal control as an avoidance mechanism under drought stress. The differences between the two clones were already shown under mild drought stress. Compared to its non-stressed condition, the DS clone showed larger decreases in P n , stomatal conductance, and transpiration rate than the DT clone. The stepwise scheme in imposing drought stress can differentiate the drought response traits in E. camaldulensis.
Starting Page	1581
Ending Page	1592
Page Count	12
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	29
Issue Number	5
e-ISSN	14322285
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Leaf gas exchange Chlorophyll fluorescence Chlorophyll content Biomass Drought stress Forestry Plant Sciences Agriculture Plant Anatomy/Development Plant Pathology Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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