Biologia Plantarum

, Volume 50, Issue 1, pp 138–141 | Cite as

Effects of drought stress on photosynthetic gas exchange, chlorophyll fluorescence and stem diameter of soybean plants

  • Y. Ohashi
  • N. Nakayama
  • H. Saneoka
  • K. Fujita
Brief Communication


Changes in plant growth, photosynthetic gas exchange, chlorophyll fluorescence and stem diameter of soybean [Glycine max (L.) Merr.] plants under drought stress were studied. Total plant dry mass was reduced by 30 % compared to well-watered control plants. Leaf water potential was slightly decreased by water stress. Water stress induced daytime shrinkage and reduced night-time expansion of stem. Photosynthetic rate, stomatal conductance and transpiration rate were significantly declined by water stress, while the intercellular CO2 concentration was changed only slightly at the initiation of stress treatment. The maximum photochemical efficiency of photosystem 2 and apparent photosynthetic electron transport rate were not changed by water stress.

Additional key words

Glycine max growth net photosynthetic rate photochemical efficiency of photosystem 2 stomatal conductance transpiration rate water stress 



intercellular CO2 concentration


days after the stress treatment


transpiration rate


apparent photosynthetic electron transport rate


variable to maximum chlorophyll fluorescence ratio (maximum photochemical efficiency of photosystem 2)


stomatal conductance


net photosynthetic rate




leaf water potential


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Copyright information

© Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Praha 2006

Authors and Affiliations

  1. 1.Graduate School of Biosphere ScienceHiroshima UniversityHigashi-HiroshimaJapan

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