LinkosaloLechowicz2006

Référence

Linkosalo, T., Lechowicz, M.J. (2006) Twilight far-red treatment advances leaf bud burst of silver birch (Betula pendula). Tree Physiology, 26(10):1249-1256.

Résumé

Bud development of boreal trees in spring, once initiated, is driven by ambient air temperature, but the mechanism triggering bud development remains unclear. We determined if some aspect of the diurnal or seasonal light regime influences initiation of bud burst once the chilling requirement is met. We grew 3-year-old birch plantlets cloned from a mature tree of boreal origin in light conditions realistically simulating the lengthening days of spring at 60° N. To emulate the reduction in red to far-red light (R:FR) ratio between daylight and twilight, one group of plantlets was subjected to reduced R:FR ratio in the morning and evening in addition to progressively lengthening days, whereas the other group was subjected to the same R:FR ratio throughout the day. The reduced R:FR ratio of twilight advanced bud burst by 4 days compared with the reference group (P = 0.04). To assess the interplay between the fulfillment of the chilling requirement and the subsequent response to warming, we fitted a thermal time model to the data with separate parameterizations for the starting dates of heat sum accumulation in each treatment. Least-squares fitting suggested that bud development started in light regimes corresponding to late March, almost two months after the chilling requirement for dormancy release was satisfied. Therefore, shortening night length or increasing day length, or both, appears to be the cue enabling bud development in spring, with twilight quality having an effect on the photoperiodic response. If twilight alone were the cue, the difference in bud burst dates between the experimental groups would have been greater than 4 days. The result gives experimental support for the use of thermal-time models in phenological modeling. © 2006 Heron Publishing.

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@ARTICLE { LinkosaloLechowicz2006,
    AUTHOR = { Linkosalo, T. and Lechowicz, M.J. },
    TITLE = { Twilight far-red treatment advances leaf bud burst of silver birch (Betula pendula) },
    JOURNAL = { Tree Physiology },
    YEAR = { 2006 },
    VOLUME = { 26 },
    PAGES = { 1249-1256 },
    NUMBER = { 10 },
    NOTE = { 0829318X (ISSN) Export Date: 26 April 2007 Source: Scopus CODEN: TRPHE Language of Original Document: English Correspondence Address: Linkosalo, T.; Department of Forest Ecology; University of Helsinki 00014 Helsinki, Finland; email: tapio.linkosalo@helsinki.fi References: Augspurger, C.K., Bartlett, E.A., Differences in leaf phenology between juvenile and adult trees in a temperate deciduous forest (2003) Tree Physiol., 23, pp. 517-525; Bach, W., Development of climatic scenarios: A. From general circulation models (1988) The Impact of Climatic Variations on Agriculture. Vol 1. Assessment in Cool Temperature and Cold Regions, pp. 125-157. , Eds. M.L. Parry, T.R. Carter and N.T. Konijn. Kluwer Academic Publishers, Dordrecht; Cannell, M.G.R., Smith, R.I., Thermal time, chill days and prediction of budburst in Picea sitchensis (1983) J. App. Ecol., 20, pp. 951-963; Chabot, B.F., Hicks, D.J., The ecology of leaf life spans (1982) Annu. Rev. Ecol. 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Plant., 88, pp. 187-191; Heide, O.M., Daylength and thermal responses of bud burst during dormancy release in some northern deciduous trees (1993) Physiol. Plant., 88, pp. 531-540; Hunter, A.F., Lechowicz, M.J., Predicting the timing of bud-burst in temperate trees (1992) J. Appl. Ecol., 29, pp. 597-604; Jones, O.P., Welander, M., Waller, B.J., Ridout, M.S., Micropropagation of adult birch trees: Production and field performance (1996) Tree Physiol, 16, pp. 521-525; Kikuzawa, K., Ecology and evolution of phenological pattern, leaf longevity and leaf habit (1989) Evol. 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Monogr., 62, pp. 365-392; Ryyna?nen, L., Aronen, T., Genome fidelity during short- and long-term tissue culture and differentially cryostored meristems of silver birch (Betula pendula) (2005) Plant Cell Tissue Organ Cult., 83, pp. 21-32; Sarvas, R., Investigations on the annual cycle of development of forest trees. II. Autumn dormancy and winter dormancy (1974) Commun. Inst. For. Fenn., 84, pp. 1-101; Schaber, J., Badeck, F.W., Physiology-based phenology models for forest tree species in Germany (2003) Int. J. Biometeorol., 47, pp. 193-201; Smith, H., Sensing the light environment: The functions of the phytocrome family (1994) Photomorphogenesis in Plants. 2nd Edn., pp. 377-416. , Eds. R.E. Kendrick and G.H.M. Kronenberg. Kluwer Academic Publishers, Dordrecht; Vince-Prue, D., The duration of light and photoperiodic responses (1994) Photomorphogenesis in Plants. 2nd Edn., pp. 447-490. , Eds. R.E. Kendrick and G.H.M. Kronenberg. Kluwer Academic Publishers, Dordrecht. },
    ABSTRACT = { Bud development of boreal trees in spring, once initiated, is driven by ambient air temperature, but the mechanism triggering bud development remains unclear. We determined if some aspect of the diurnal or seasonal light regime influences initiation of bud burst once the chilling requirement is met. We grew 3-year-old birch plantlets cloned from a mature tree of boreal origin in light conditions realistically simulating the lengthening days of spring at 60° N. To emulate the reduction in red to far-red light (R:FR) ratio between daylight and twilight, one group of plantlets was subjected to reduced R:FR ratio in the morning and evening in addition to progressively lengthening days, whereas the other group was subjected to the same R:FR ratio throughout the day. The reduced R:FR ratio of twilight advanced bud burst by 4 days compared with the reference group (P = 0.04). To assess the interplay between the fulfillment of the chilling requirement and the subsequent response to warming, we fitted a thermal time model to the data with separate parameterizations for the starting dates of heat sum accumulation in each treatment. Least-squares fitting suggested that bud development started in light regimes corresponding to late March, almost two months after the chilling requirement for dormancy release was satisfied. Therefore, shortening night length or increasing day length, or both, appears to be the cue enabling bud development in spring, with twilight quality having an effect on the photoperiodic response. If twilight alone were the cue, the difference in bud burst dates between the experimental groups would have been greater than 4 days. The result gives experimental support for the use of thermal-time models in phenological modeling. © 2006 Heron Publishing. },
    KEYWORDS = { Chilling Dormancy Light environment Phenology Phytochrome Sequential model Thermal time model },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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