Variable Chlorophyll a Fluorescence as a Potential Indicator of Black Spruce Seedling Freezing Tolerance Under Nursery Conditions
Autumnal developmental decline in photosynthetic efficiency as measured by chlorophyll a variable fluorescence (Fv/Fm) was not found to correlate well with the freezing tolerance of black spruce (Picea mariana Mill. B.S.P.) seedlings produced in nursery greenhouses. A late-seeded (so-called extended) greenhouse crop maintained under a warmer temperature regime retained the potential for efficient photosynthesis, yet was tolerant of freezing to -30ºC. Variable chlorophyll a fluorescence can, however, serve as a quick and convenient measure of a degree of damage suffered by seedlings following a -30ºC freezing test. This measurement may complement the more laborious index of injury determination in current use. Tree Planters' Notes 46(2):107-111; 1995.
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Author(s): Garry Devisscher, Norman P.A. Hurter, Ladislav Malek
Publication: Tree Planters' Notes - Volumes 46, Number 3 (1995)
Section: Peer Reviewed and Refereed Articles
Volume: 46
Number: 3
