Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 433365
Title Co-ordination of hydraulic and stomatal conductances across light qualities in cucumber leaves
Author(s) Savvides, A.; Fanourakis, D.; Ieperen, W. van
Source Journal of Experimental Botany 63 (2012)3. - ISSN 0022-0957 - p. 1135 - 1143.
Department(s) Horticultural Supply Chains
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) birch betula-pendula - blue-light - chlorophyll-fluorescence - adaptive significance - plant development - leaf conductance - guard-cells - xylem sap - red light - irradiance
Abstract Long-term effects of light quality on leaf hydraulic conductance (Kleaf) and stomatal conductance (gs) were studied in cucumber, and their joint impact on leaf photosynthesis in response to osmotic-induced water stress was assessed. Plants were grown under low intensity monochromatic red (R, 640 nm), blue (B, 420 nm) or combined red and blue (R:B, 70:30) light. Kleaf and gs were much lower in leaves that developed without blue light. Differences in gs were caused by differences in stomatal aperture and stomatal density, of which the latter was largely due to differences in epidermal cell size and hardly due to stomatal development. Net photosynthesis (AN) was lowest in R-, intermediate in B-, and highest in RB- grown leaves. The low AN in R-grown leaves correlated with a low leaf internal CO2 concentration and reduced PSII operating efficiency. In response to osmotic stress, all leaves showed similar degrees of stomatal closure, but the reduction in AN was larger in R- than in B- and RB-grown leaves. This was probably due to damage of the photosynthetic apparatus, which only occurred in R-grown leaves. The present study shows the co-ordination of Kleaf and gs across different light qualities, while the presence of blue in the light spectrum seems to drive both Kleaf and gs towards high, sun-type leaf values, as was previously reported for maximal photosynthetic capacity and leaf morphology. The present results suggest the involvement of blue light receptors in the usually harmonized development of leaf characteristics related to water relations and photosynthesis under different light environments.
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