Biologia Plantarum

, Volume 59, Issue 1, pp 198–200 | Cite as

The photosynthetic parameters of cucumber as affected by irradiances with different red:far-red ratios

Brief Communication

Abstract

We compared photosynthetic performance between cucumber (Cucumis sativus L.) leaves acclimated to saturating irradiances with high red: far red (R:FR = 10) and normal R:FR (= 1.4) ratios. The net photosynthetic rate (PN) and stomatal conductance (gs) of the leaves acclimated to high R:FR were greater than those of the leaves acclimated to normal R:FR; the greater gs partly explains the greater PN. The greater gs of the high-R:FR-leaves probably resulted from a higher stomatal density and/or a greater size. PN of the high R:FR leaves was still greater than that of the normal R:FR leaves at the same intercellular CO2 concentration (ci). This indicates that non-stomatal factors also increased the photosynthetic capacity of the high R:FR leaves. The maximum Rubisco carboxylase activity estimated from a PN-ci curve analysis was also greater in the high R:FR leaves, however, the intrinsic water-use efficiency (WUEi = PN/gs) of the high R:FR leaves was lower than that of the normal R:FR leaves.

Additional key words

Cucumis sativus intrinsic water-use efficiency Rubisco stomatal conductance stomatal density 

Abbreviations

ci

intercellular CO2 concentration

gs

stomatal conductance

LMA

dry leaf mass per unit area

PN

net photosynthetic rate

PPFD

photosynthetic photon flux density

R:FR

red:far-red ratio

Vcmax

maximum Rubisco carboxylase activity

WUEi

intrinsic water-use efficiency

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Supplementary material

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.Graduate School of Life and Environmental SciencesOsaka Prefecture UniversitySakai, OsakaJapan
  2. 2.School of Life and Environmental SciencesOsaka Prefecture UniversitySakai, OsakaJapan

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