Blue light dose–responses of leaf photosynthesis, morphology, and chemical composition of Cucumis sativus grown under different combinations of red and blue light

The blue part of the light spectrum has been associated with leaf characteristics which also develop under high irradiances. In this study blue light dose–response curves were made for the photosynthetic properties and related developmental characteristics of cucumber leaves that were grown at an eq...

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Bibliographic Details
Published in:	Journal of experimental botany 2010-06, Vol.61 (11), p.3107-3117
Main Authors:	Hogewoning, Sander W., Trouwborst, Govert, Maljaars, Hans, Poorter, Hendrik, van Ieperen, Wim, Harbinson, Jeremy
Format:	Article
Language:	eng
Subjects:	acetabularia-mediterranea Biological and medical sciences Blue light Chlorophyll - analysis Chlorophyll - metabolism chlorophyll fluorescence chlorophyll fluorescence imaging Chlorophylls co2 assimilation cucumber (Cucumis sativus) Cucumbers Cucumis sativus - chemistry Cucumis sativus - growth & development Cucumis sativus - metabolism Cucumis sativus - radiation effects dose–response curves electron-transport emitting-diodes leds Fundamental and applied biological sciences. Psychology Irradiance Leaf area leaf mass per unit leaf area (LMA) Leaves Light Light emitting diodes light-emitting diodes (LEDs) Nitrogen - analysis Nitrogen - metabolism Percentages photoinhibition Photosynthesis Photosynthesis - radiation effects photosynthetic capacity photosystem-ii Plant Leaves - chemistry Plant Leaves - growth & development Plant Leaves - metabolism Plant Leaves - radiation effects Plants quantum yield red light RESEARCH PAPER Research Papers starch accumulation supplemental blue Visible spectrum
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Summary:	The blue part of the light spectrum has been associated with leaf characteristics which also develop under high irradiances. In this study blue light dose–response curves were made for the photosynthetic properties and related developmental characteristics of cucumber leaves that were grown at an equal irradiance under seven different combinations of red and blue light provided by light-emitting diodes. Only the leaves developed under red light alone (0% blue) displayed dysfunctional photosynthetic operation, characterized by a suboptimal and heterogeneously distributed dark-adapted Fv/Fm, a stomatal conductance unresponsive to irradiance, and a relatively low light-limited quantum yield for CO2 fixation. Only 7% blue light was sufficient to prevent any overt dysfunctional photosynthesis, which can be considered a qualitatively blue light effect. The photosynthetic capacity (Amax) was twice as high for leaves grown at 7% blue compared with 0% blue, and continued to increase with increasing blue percentage during growth measured up to 50% blue. At 100% blue, Amax was lower but photosynthetic functioning was normal. The increase in Amax with blue percentage (0–50%) was associated with an increase in leaf mass per unit leaf area (LMA), nitrogen (N) content per area, chlorophyll (Chl) content per area, and stomatal conductance. Above 15% blue, the parameters Amax, LMA, Chl content, photosynthetic N use efficiency, and the Chl:N ratio had a comparable relationship as reported for leaf responses to irradiance intensity. It is concluded that blue light during growth is qualitatively required for normal photosynthetic functioning and quantitatively mediates leaf responses resembling those to irradiance intensity.
ISSN:	0022-0957 1460-2431