CalmeMargolisBigrasEtAl1995

Reference

Calme, S., Margolis, H.A., Bigras, F.J., Mailly, D. (1995) The relationship between water-content and frost tolerance in shoots of hardwood seedlings. Canadian Journal of Forest Research, 25(11):1738-1745.

Abstract

Two experiments were designed to test the relationship between water content and frost tolerance in stems of hardwood seedlings during the frost hardening process. In the first experiment, 3-month-old container-grown yellow birch (Betula alleghaniensis Britton) seedlings were submitted to a decreasing temperature regime in a 8-h (short day, SD) or 16-h (long day, LD) photoperiod in growth chambers. In the second experiment, 3-month-old container-grown red oak (Quercus rubra L.), bur oak (Quercus macrocarpa Michx.), and yellow birch seedlings were naturally cold hardened in a production polyhouse. To estimate frost tolerance, freezing tests were performed on whole seedlings (experiment 1) or on the upper 5 cm of the stem apex (experiment 2), and stem damage was visually estimated. Water content of the apex (5 cm) was expressed as the ratio of dry mass over fresh mass (DM/FM) for both experiments. Frost tolerance and DM/FM increased during the course of both experiments. In the growth-chamber experiment, SD seedlings hardened deeper than LD ones (-19.2 degrees C for SD versus -15.7 degrees C for LD), and DM/FM was higher for SD after 60 days of photoperiod treatment. In the polyhouse experiment, bur oak, yellow birch, and red oak reached a frost tolerance of -26.7, -25.1, and -20.4 degrees C, respectively, on November 2. The three species had DM/FM ratios of about 50% on November 2. For both experiments, DM/FM values higher than 45% corresponded to seedlings with a frost tolerance of -10 degrees C or lower

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@ARTICLE { CalmeMargolisBigrasEtAl1995,
    AUTHOR = { Calme, S. and Margolis, H.A. and Bigras, F.J. and Mailly, D. },
    TITLE = { The relationship between water-content and frost tolerance in shoots of hardwood seedlings },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 1995 },
    VOLUME = { 25 },
    PAGES = { 1738-1745 },
    NUMBER = { 11 },
    NOTE = { Times Cited: 12 },
    ABSTRACT = { Two experiments were designed to test the relationship between water content and frost tolerance in stems of hardwood seedlings during the frost hardening process. In the first experiment, 3-month-old container-grown yellow birch (Betula alleghaniensis Britton) seedlings were submitted to a decreasing temperature regime in a 8-h (short day, SD) or 16-h (long day, LD) photoperiod in growth chambers. In the second experiment, 3-month-old container-grown red oak (Quercus rubra L.), bur oak (Quercus macrocarpa Michx.), and yellow birch seedlings were naturally cold hardened in a production polyhouse. To estimate frost tolerance, freezing tests were performed on whole seedlings (experiment 1) or on the upper 5 cm of the stem apex (experiment 2), and stem damage was visually estimated. Water content of the apex (5 cm) was expressed as the ratio of dry mass over fresh mass (DM/FM) for both experiments. Frost tolerance and DM/FM increased during the course of both experiments. In the growth-chamber experiment, SD seedlings hardened deeper than LD ones (-19.2 degrees C for SD versus -15.7 degrees C for LD), and DM/FM was higher for SD after 60 days of photoperiod treatment. In the polyhouse experiment, bur oak, yellow birch, and red oak reached a frost tolerance of -26.7, -25.1, and -20.4 degrees C, respectively, on November 2. The three species had DM/FM ratios of about 50% on November 2. For both experiments, DM/FM values higher than 45% corresponded to seedlings with a frost tolerance of -10 degrees C or lower },
    KEYWORDS = { BLACK SPRUCE; HARDINESS },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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