TY  - JOUR
AU  - Hogewoning, S.W.
AU  - Trouwborst, G.
AU  - Maljaars, H.
AU  - Poorter, H.
AU  - van Ieperen, W.
AU  - Harbinson, J.
TI  - Blue light dose-responses of leaf photosynthesis, morphology, and chemical composition of Cucumis sativus grown under different combinations of red and blue light
JO  - The journal of experimental botany
VL  - 61
SN  - 0022-0957
CY  - Oxford
PB  - Univ. Press
M1  - PreJuSER-9587
SP  - 3107 - 3117
PY  - 2010
N1  - This research is supported by the Dutch Technology Foundation STW, Applied Science Division of the NWO, and the Technology Program of the Ministry of Economic Affairs, Philips, and Plant Dynamics BV. We are grateful to Joost Ruijsch, Evert Janssen, and Gradus Leenders (equipment development), Annie van Gelder and Joke Oosterkamp (stomata analysis), Arjen van de Peppel (biochemical analysis), and Hennie Halm C/N measurements).
AB  - 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 F(v)/F(m), a stomatal conductance unresponsive to irradiance, and a relatively low light-limited quantum yield for CO(2) 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 (A(max)) 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, A(max) was lower but photosynthetic functioning was normal. The increase in A(max) 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 A(max), 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.
KW  - Chlorophyll: analysis
KW  - Chlorophyll: metabolism
KW  - Cucumis sativus: chemistry
KW  - Cucumis sativus: growth & development
KW  - Cucumis sativus: metabolism
KW  - Cucumis sativus: radiation effects
KW  - Light
KW  - Nitrogen: analysis
KW  - Nitrogen: metabolism
KW  - Photosynthesis: radiation effects
KW  - Plant Leaves: chemistry
KW  - Plant Leaves: growth & development
KW  - Plant Leaves: metabolism
KW  - Plant Leaves: radiation effects
KW  - Chlorophyll (NLM Chemicals)
KW  - Nitrogen (NLM Chemicals)
KW  - J (WoSType)
KW  - Blue light
KW  - chlorophyll fluorescence imaging
KW  - cucumber (Cucumis sativus)
KW  - dose–response curves
KW  - leaf mass per unit leaf area (LMA)
KW  - light-emitting diodes (LEDs)
KW  - photoinhibition
KW  - photosynthetic capacity
KW  - red light
KW  - starch accumulation
LB  - PUB:(DE-HGF)16
C6  - pmid:20504875
C2  - pmc:PMC2892149
UR  - <Go to ISI:>//WOS:000279188100021
DO  - DOI:10.1093/jxb/erq132
UR  - https://juser.fz-juelich.de/record/9587
ER  -