, Volume 49, Issue 4, pp 633–636 | Cite as

Comparison of gas exchange and chlorophyll fluorescence of low-potassium-tolerant and -sensitive soybean [Glycine max (L.) Merr.] cultivars under low-potassium condition

  • X. -T. Li
  • P. Cao
  • X. -G. Wang
  • M. -J. Cao
  • H. -Q. Yu
Brief Communication


The effects of potassium (K) deficiency on chlorophyll (Chl) content, photosynthetic gas exchange, and photosystem II (PSII) photochemistry during the seedling stage were investigated in two soybean [Glycine max (L.) Merr.] cultivars, low-K sensitive Tiefeng31 and low-K tolerant Shennong6. The cultivars were grown hydroponically in K-sufficient (KS) and K-deficient (KD) solutions. Photosynthetic gas exchange and Chl content in Tiefeng31 were severely affected by the low K condition, but were almost unaffected in Shennong6. This difference is in accordance with the PSII photochemistry in the plants, indicating that the photosynthetic apparatus of Shennong6 is more tolerant to low-K stress than that of Tiefeng31.

Additional key words

chlorophyll fluorescence low-K stress mesophyll resistance net photosynthetic rate stomatal conductance 



the space above the fluorescence curve between F0 and Fm




intercellular CO2 concentration


transpiration rate


maximal Chl fluorescence yield of dark-adapted state


minimal fluorescence yield of dark-adapted state


variable Chl fluorescence


maximal photochemical efficiency of PSII


stomatal conductance to water vapour








net photosynthetic rate


primary quinone acceptor of PSII


reaction centre


relative variable fluorescence intensity at the J-step


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This work is supported by a grant from Shenyang Agricultural University for young teachers (2006109) and the Creative Team Project (CTP) from the education department of Liaoning province.


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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • X. -T. Li
    • 1
  • P. Cao
    • 1
  • X. -G. Wang
    • 1
  • M. -J. Cao
    • 1
  • H. -Q. Yu
    • 1
  1. 1.College of AgricultureShenyang Agricultural UniversityShenyangP.R. China

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