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


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 



intercellular CO2 concentration


stomatal conductance


dry leaf mass per unit area


net photosynthetic rate


photosynthetic photon flux density


red:far-red ratio


maximum Rubisco carboxylase activity


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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