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Photosynthetica

, 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

Abstract

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 

Abbreviations

Area

the space above the fluorescence curve between F0 and Fm

Chl

chlorophyll

Ci

intercellular CO2 concentration

E

transpiration rate

Fm

maximal Chl fluorescence yield of dark-adapted state

F0

minimal fluorescence yield of dark-adapted state

Fv

variable Chl fluorescence

Fv/Fm

maximal photochemical efficiency of PSII

gs

stomatal conductance to water vapour

K

potassium

KD

K-deficient

KS

K-sufficient

PN

net photosynthetic rate

QA

primary quinone acceptor of PSII

RC

reaction centre

Vj

relative variable fluorescence intensity at the J-step

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Notes

Acknowledgement

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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