Effects of Water Stress on Photosynthetic Capabilities of Populus bachofenii × P.pyramidalis ‘ ROZ’
A pot experiment was conducted in greenhouse to study the photosynthetic capacity and contents of osmotic regulation substances of Populus bachofenii × P. pyramidalis ' ROZ' treated with different water stress for 24 days. The results showed that the water stress restrained the leaf photosynthetic capacity, increased the soluble protein contents in leaf cells, and influenced the soluble sugar contents in leaf cells. Along with the increase of stress intensity and elongation of stress time, significantly decrease occurred for the net photosynthetic rate(Pn) , transpiration rate(Tt)and stomata conductance(Gs) of leaves. The Pn had highly significant positive correlation with Tr and Gs and significant positive correlation with water contents in soil. The Gs had highly significant positive correlation with Tr, and significant positive correlation with water contents in soil and soluble sugar contents in leaf cells. The Tr had significant positive correlation with soluble sugar contents. The decrease of Pn was attributed to stomatal restrictions when the contents of water in soil was greater than 25% and non-stomatal restrictions when the water contents was lower than 25%.
Populus bachofenii × P. pyramidalis ' ROZ'water stressseedlingphotosynthetic capabilityosmotic regulation substances
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