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000009587 1001_ $$0P:(DE-HGF)0$$aHogewoning, S.W.$$b0
000009587 245__ $$aBlue light dose-responses of leaf photosynthesis, morphology, and chemical composition of Cucumis sativus grown under different combinations of red and blue light
000009587 260__ $$aOxford$$bUniv. Press$$c2010
000009587 29510 $$aJournal of Experimental Botany, Vol. 61, No. 11, pp. 3107–3117, 2010
000009587 300__ $$a3107 - 3117
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000009587 500__ $$aThis 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).
000009587 500__ $$aThis is an electronic version of an article published in: J. Exp. Bot. (2010) 61 (11): 3107-3117
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000009587 520__ $$aThe 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.
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000009587 65320 $$2Author$$aBlue light
000009587 65320 $$2Author$$achlorophyll fluorescence imaging
000009587 65320 $$2Author$$acucumber (Cucumis sativus)
000009587 65320 $$2Author$$adose-response curves
000009587 65320 $$2Author$$aleaf mass per unit leaf area (LMA)
000009587 65320 $$2Author$$alight-emitting diodes (LEDs)
000009587 65320 $$2Author$$aphotoinhibition
000009587 65320 $$2Author$$aphotosynthetic capacity
000009587 65320 $$2Author$$ared light
000009587 65320 $$2Author$$astarch accumulation
000009587 650_2 $$2MeSH$$aChlorophyll: analysis
000009587 650_2 $$2MeSH$$aChlorophyll: metabolism
000009587 650_2 $$2MeSH$$aCucumis sativus: chemistry
000009587 650_2 $$2MeSH$$aCucumis sativus: growth & development
000009587 650_2 $$2MeSH$$aCucumis sativus: metabolism
000009587 650_2 $$2MeSH$$aCucumis sativus: radiation effects
000009587 650_2 $$2MeSH$$aLight
000009587 650_2 $$2MeSH$$aNitrogen: analysis
000009587 650_2 $$2MeSH$$aNitrogen: metabolism
000009587 650_2 $$2MeSH$$aPhotosynthesis: radiation effects
000009587 650_2 $$2MeSH$$aPlant Leaves: chemistry
000009587 650_2 $$2MeSH$$aPlant Leaves: growth & development
000009587 650_2 $$2MeSH$$aPlant Leaves: metabolism
000009587 650_2 $$2MeSH$$aPlant Leaves: radiation effects
000009587 650_7 $$01406-65-1$$2NLM Chemicals$$aChlorophyll
000009587 650_7 $$07727-37-9$$2NLM Chemicals$$aNitrogen
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000009587 650_7 $$aBlue light
000009587 650_7 $$achlorophyll fluorescence imaging
000009587 650_7 $$acucumber (Cucumis sativus)
000009587 650_7 $$adose–response curves
000009587 650_7 $$aleaf mass per unit leaf area (LMA)
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000009587 7001_ $$0P:(DE-HGF)0$$aHarbinson, J.$$b5
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