Gaumont-GuayMargolisBigrasEtAl2003

Référence

Gaumont-Guay, D., Margolis, H.A., Bigras, F.J., Raulier, F. (2003) Characterizing the frost sensitivity of black spruce photosynthesis during cold acclimation. Tree Physiology, 23(5):301-311.

Résumé

We used photosynthetic light response curves to measure and model the responses of two provenances of 3-year-old black spruce (Picea mariana (Mill.) BSP) seedlings to severe artificial frost treatments applied at 2-week intervals during cold acclimation. Black spruce seedlings responded to cold acclimation with long-term suppression of photosynthetic capacity (A(max)) and apparent quantum-use efficiency (alpha'). Short-term reductions in both photosynthetic parameters following frost treatments were dependent on the extent of cold acclimation of the seedlings and the severity of the frost treatments. Large reductions in Am in response to the frost treatments were observed in seedlings that had undergone little cold acclimation and these reductions were associated with an irreversible reduction in alpha'. Such seedlings recovered only partially during the subsequent 23 days, whereas seedlings in most other treatments showed complete recovery of A(max) after 13 days. The impact of frost treatments on A(max) and alpha' did not vary with seedling provenance. We propose an algorithm that predicts the combined effects of cold acclimation and severe freezing temperatures on the extent of the suppression of A(max) during autumn. The algorithm is based on (1) the maximum A(max) observed during the growing season, (2) the accumulation of cold degree-days, based on a minimum nocturnal temperature < 5 degreesC, and (3) the severity of freezing temperatures during autumn. The parameters developed in the algorithm showed that cold acclimation of black spruce seedlings had a greater impact on the reduction of A(max) in autumn than did the severe frost treatments. Mean A(max) of seedlings subjected to artificial frosts showed a strong correlation with values predicted by the algorithm (r(2) = 0.91).

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@ARTICLE { Gaumont-GuayMargolisBigrasEtAl2003,
    AUTHOR = { Gaumont-Guay, D. and Margolis, H.A. and Bigras, F.J. and Raulier, F. },
    TITLE = { Characterizing the frost sensitivity of black spruce photosynthesis during cold acclimation },
    JOURNAL = { Tree Physiology },
    YEAR = { 2003 },
    VOLUME = { 23 },
    PAGES = { 301-311 },
    NUMBER = { 5 },
    NOTE = { Times Cited: 5 },
    ABSTRACT = { We used photosynthetic light response curves to measure and model the responses of two provenances of 3-year-old black spruce (Picea mariana (Mill.) BSP) seedlings to severe artificial frost treatments applied at 2-week intervals during cold acclimation. Black spruce seedlings responded to cold acclimation with long-term suppression of photosynthetic capacity (A(max)) and apparent quantum-use efficiency (alpha'). Short-term reductions in both photosynthetic parameters following frost treatments were dependent on the extent of cold acclimation of the seedlings and the severity of the frost treatments. Large reductions in Am in response to the frost treatments were observed in seedlings that had undergone little cold acclimation and these reductions were associated with an irreversible reduction in alpha'. Such seedlings recovered only partially during the subsequent 23 days, whereas seedlings in most other treatments showed complete recovery of A(max) after 13 days. The impact of frost treatments on A(max) and alpha' did not vary with seedling provenance. We propose an algorithm that predicts the combined effects of cold acclimation and severe freezing temperatures on the extent of the suppression of A(max) during autumn. The algorithm is based on (1) the maximum A(max) observed during the growing season, (2) the accumulation of cold degree-days, based on a minimum nocturnal temperature < 5 degreesC, and (3) the severity of freezing temperatures during autumn. The parameters developed in the algorithm showed that cold acclimation of black spruce seedlings had a greater impact on the reduction of A(max) in autumn than did the severe frost treatments. Mean A(max) of seedlings subjected to artificial frosts showed a strong correlation with values predicted by the algorithm (r(2) = 0.91). },
    KEYWORDS = { boreal forest; conifer; freezing temperatures; hardening; model; Picea mariana; photosynthetic capacity; photosynthetic efficiency PINE PINUS-SYLVESTRIS; SCOTS PINE; ATMOSPHERIC CO2; CHLOROPHYLL FLUORESCENCE; SOIL-TEMPERATURE; ENGELMANN SPRUCE; GROWING-SEASON; CLIMATE-CHANGE; NORWAY SPRUCE; GAS-EXCHANGE },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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