Photosynthetica

, Volume 55, Issue 3, pp 421–433

Relationship between photosynthetic pigments and chlorophyll fluorescence in soybean under varying phosphorus nutrition at ambient and elevated CO2

  • S. K. Singh
  • V. R. Reddy
  • D. H. Fleisher
  • D. J. Timlin
Original Paper

DOI: 10.1007/s11099-016-0657-0

Cite this article as:
Singh, S.K., Reddy, V.R., Fleisher, D.H. et al. Photosynthetica (2017) 55: 421. doi:10.1007/s11099-016-0657-0
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Abstract

To assess the relationship between chlorophyll (Chl) fluorescence (CF) and photosynthetic pigments, soybean was grown under varying phosphorus (P) nutrition at ambient and elevated CO2 (EC). The EC stimulated, but P deficiency decreased plant height, node numbers, and leaf area concomitantly with the rates of stem elongation, node addition, and leaf area expansion. Under P deficiency, CF parameters and pigments declined except that carotenoids (Car) were relatively stable indicating its role in photoprotection. The CF parameters were strongly related with Chl concentration but not with Chl a/b or Car. However, total Chl/Car showed the strongest association with CF parameters such as quantum efficiency and yield of photosystem II. This relationship was not affected by CO2 treatment. The high correlation between CF and total Chl/Car underscores the significance of the quantification of both, Chl and Car concentrations, to understand the photochemistry and underlying processes of photoprotection and mechanisms of excess energy dissipation in a given environment.

Additional key words

chlorophyll/carotenoids ratio energy dissipation photochemical quenching relationship response curve 

Abbreviations

AC

ambient CO2

Car

carotenoids

Chl

chlorophyll

EC

elevated CO2

DAP

days after planting

DAT

days after treatment

Fv'/Fm'

quantum efficiency by oxidized (open) PSII reaction center in light or PSII efficiency

MLAER

main-stem leaf area expansion rate

MNAR

main-stem node addition rate

MSER

main-stem elongation rate

MSLA

main-stem leaf area

MSNN

main-stem node number

PS

photosystem

TChl

total chlorophylls

Copyright information

© The Institute of Experimental Botany 2017

Authors and Affiliations

  • S. K. Singh
    • 1
    • 2
  • V. R. Reddy
    • 1
  • D. H. Fleisher
    • 1
  • D. J. Timlin
    • 1
  1. 1.Crop Systems and Global Change LaboratoryUSDA-ARSBeltsvilleUSA
  2. 2.Wye Research and Education CenterUniversity of MarylandBeltsvilleUSA

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