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Titolo:
Phytochrome mediated effects on leaves of white clover: Consequences for light interception by the plant under competition for light
Autore:
Heraut-Bron, V; Robin, C; Varlet-Grancher, C; Guckert, A;
Indirizzi:
INRA Agron & environm, ENSAIA, Unite Mixte Rech INPL, F-54505 Vandoeuvre Les Nancy, France INRA Agron & environm Vandoeuvre Les Nancy France F-54505 Nancy, France INRA, Lab Ecophysiol Plantes Fourrageres, F-86600 Lusignan, France INRA Lusignan France F-86600 antes Fourrageres, F-86600 Lusignan, France
Titolo Testata:
ANNALS OF BOTANY
, volume: 88, anno: 2001,
pagine: 737 - 743
SICI:
0305-7364(200110)88:<737:PMEOLO>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIMULATED VEGETATION SHADE; NET CO2 ASSIMILATION; TRIFOLIUM-REPENS L; FAR-RED RATIO; OF-DAY RED; CARBON ASSIMILATION; GROWTH; PHOTOSYNTHESIS; QUALITY; MORPHOLOGY;
Keywords:
leaf development; photomorphogenesis; light quality; R : FR ratio; assimilate partitioning; light interception; foraging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Robin, C INRA Agron & environm, ENSAIA, Unite Mixte Rech INPL, Nancy Colmar BP 172,F-54505 Vandoeuvre Les Nancy, France INRA Agron & environm Nancy Colmar BP 172 Vandoeuvre Les Nancy France F-54505
Citazione:
V. Heraut-Bron et al., "Phytochrome mediated effects on leaves of white clover: Consequences for light interception by the plant under competition for light", ANN BOTANY, 88, 2001, pp. 737-743

Abstract

Competition for light is one of the main factors affecting the persistenceof clover in plant communities. As a signal of plant competition, loweringthe red to far-red (R:FR) ratio of incident light is known to elicit morphological responses in white clover shoots, such as reducing the branching rate and increasing organ size. The objectives of this study were to examinethe influence of the R:FR ratio on leaf development and to investigate theconsequences for the ability of leaves to intercept light. Two short-term experiments were conducted on isolated plants using either selective light filters in a glasshouse (expt 1) or monochromatic light-emitting diodes in a climate chamber (expt 2) to induce changes in the R:FR ratio. In each experiment, morphological data and biomass were recorded. Four weeks after theestablishment of the light treatments, plants were labelled with (CO2)-C-14 (expt 1). The optical properties (absorptance, transmittance and reflectance) of main stolon leaves were measured. Rates of leaf initiation and emergence were not influenced by light treatment in either experiment and no significant effect of the R:FR ratio was observed on mean leaf area of individual leaves. However, light quality acted indirectly on total leaf area mainly through branch development, as previously demonstrated in white clover. Lowering the R:FR ratio stimulated petiole elongation and this was sustained by the allocation of more biomass to growing petioles and more C-14 assimilates to growing stolon apices. It is suggested that light interception by white clover leaves could be influenced through FR-promoted petiole growth only, as there was no direct modification of individual leaf area, or of the capacity of leaves to absorb light and assimilate carbon. (C) 2001 Annals of Botany Company.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 16:02:51