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Photosynthetica

, Volume 47, Issue 3, pp 381–387 | Cite as

Photosynthetic response of salt-tolerant and sensitive soybean varieties

  • K. X. Lu
  • B. H. Cao
  • X. P. Feng
  • Y. He
  • D. A. Jiang
Article

Abstract

The physiological response of two soybean varieties to salt stress was examined. The results showed that salt stress induced a significantly (p<0.01) lower decrease of the net photosynthetic rate (P N) in salt-tolerant S111-9 than in salt-sensitive Glycine max. P N decrease was positively related to the decrease of stomatal conductance (g s) and intercellular CO2 concentration (C i) in S111-9, while with g s in G. max. a threshold of relative water content (RWC) was found, above which a slight decrease in RWC lead to a sharp reduction in g s. The photochemical quenching (qP), the efficiency of open PSII centers (ΦPSII) and the Rubisco activity (RA) significantly decreased with increasing salinity level in G. max. The maximum PSII quantum yield (Fv/Fm) decreased significantly under the highest NaCl in both varieties. The higher reduction of RA in G. max was attributed to Rubisco content, which was mainly regulated at LSU expression level rather than at rbcL transcript level. These findings led us to conclude that the salt-induced reduction in P N was mainly due g s and RA for S111-9 and G. max, respective

Additional key words

chlorophyll fluorescence NaCl photosynthesis Rubisco 

Abbreviations

Chl

chlorophyll

Ci

intercellular CO2 concentration

ETR

electron transport rate

Fo

initial chlorophyll fluorescence

Fm

maximal chlorophyll fluorescence

Fm

maximal chlorophyll fluorescence under light

Fv

variable fluorescence

Fv

variable fluorescence under light

Fv/Fm

maximum PSII quantum yield

Fv′/Fm

the quantum yield of open PSII centers under irradiation

gs

stomatal conductance

LSU

large subunit of Rubisco

PFD

photon flux density

PN

net photosynthetic rate

PSII

photosystem II

qP

photochemical quenching

RA

Rubisco activity

RWC

relative water content

ΦPSII

efficiency of open PSII centers

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • K. X. Lu
    • 1
    • 2
  • B. H. Cao
    • 1
  • X. P. Feng
    • 1
  • Y. He
    • 1
  • D. A. Jiang
    • 1
  1. 1.State Key Laboratory of Plant Physiology and Biochemistry, College of Life SciencesZhejiang UniversityHangzhouChina
  2. 2.Faculty of Life Science and BiotechnologyNingbo UniversityNingboChina

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