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园艺学报 ›› 2007, Vol. 34 ›› Issue (4): 959-964.

• 观赏植物 • 上一篇    下一篇

水分胁迫对云锦杜鹃光合生理和光温响应的影响

柯世省*; 杨敏文
  

  1. (台州学院生命科学学院, 浙江临海317000)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-08-25 发布日期:2007-08-25

Effects of Water Stress on Photosynthetic Physiologica l Characteristics inLeaves of Rhododendron fortunei and Their Response to Light and Temperature

KE Shi-sheng*;YANG Min-wen   

  1. (School of Life Science, Taizhou University, Linhai, Zhejiang 317000,China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-08-25 Published:2007-08-25

摘要: 以盆栽5年生云锦杜鹃苗木为材料, 研究了不同强度土壤水分胁迫对其叶片某些光合生理特
性及其对光温响应的影响。结果表明: 在轻度水分胁迫下净光合速率的下降由气孔限制引起, 而中度和重
度胁迫下则由非气孔限制引起。在较高强度的水分胁迫下, 云锦杜鹃光补偿点和气孔阻力升高, 光饱和点、
表观量子效率、最大净光合速率、Fv/Fm和蒸腾速率下降, 而暗呼吸速率先升后降, 胞间CO2浓度先降后
升, 高温加重了水分胁迫对光合作用的不利影响。


关键词: 云锦杜鹃, 水分胁迫, 光合生理特性, 光响应, 温度响应

Abstract: The effects of soilwater stress on some photosynthetic physiological characteristics in leaves of
Rhododendron 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 pots
of p lant seedlingswith a similar growth were divided into 4 groups: no stress ( control) , light stress, moderate
stress and heavy stress. Net photosynthesis rate ( Pn) declined underwater stress conditions. According to the
criteria 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 undermoderate
and 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 heavy
stress. 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