ACTA HORTICULTURAE SINICA ›› 2007, Vol. 34 ›› Issue (4): 959-964.
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KE Shi-sheng*;YANG Min-wen
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Abstract: The effects of soilwater stress on some photosynthetic physiological characteristics in leaves ofRhododendron fortunei and their response to light and temperature were investigated by using 5-year-old pot-cultured seedlings as experimentalmaterials and exposing them to different levels of water stress. Twelve potsof p lant seedlingswith a similar growth were divided into 4 groups: no stress ( control) , light stress, moderatestress and heavy stress. Net photosynthesis rate ( Pn) declined underwater stress conditions. According to thecriteria suggested by Farquhar and Sharkey, the dep ression of photosynthesismay be attributed to stomatal limitation under light water stress conditions, while thatmay be linked to non-stomatal limitation undermoderateand heavy stress conditions. In comparison with the control group, light compensation point (LCP) and stomatal resistance ( rs ) increased, light saturation point (LSP) , apparent quantum yield (AQY) , maximal Pn( Pm) , Fv/Fm and transp iration rate ( Tr) in the other group s declined along the water stress gradients. Besides, the dark resp iration rate (Rd) increased under light and moderate stress, but decreased under heavystress. The intercellular CO2 concentration (Ci) disp layed adverse trend compared with that of Rd. High temperature aggravated the stress effect of water on photosynthesis.
Key words: Rhododendron fortunei, Water stress, Photosynthetic physiological characteristics, Responseto light, Response to temperature
KE Shi-sheng;YANG Min-wen. Effects of Water Stress on Photosynthetic Physiologica l Characteristics inLeaves of Rhododendron fortunei and Their Response to Light and Temperature[J]. ACTA HORTICULTURAE SINICA, 2007, 34(4): 959-964.
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https://www.ahs.ac.cn/EN/Y2007/V34/I4/959