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Related Experiment Videos

Physiological changes in red spruce seedlings during a simulated winter thaw.

P G Schaberg1, J B Shane, G J Hawley

  • 1Northeastern Forest Experiment Station, P.O. Box 968, Burlington, VT 05402, USA.

Tree Physiology
|June 1, 1996
PubMed
Summary

Continuous thaw conditions negatively impact red spruce (Picea rubens Sarg.) seedlings, reducing cold hardiness and altering physiological responses. These changes suggest an indirect link between gas exchange and cold tolerance during winter thaw events.

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Tree physiology·2004

Area of Science:

  • Plant physiology
  • Forest ecology
  • Environmental stress biology

Background:

  • Winter thaw events can significantly impact evergreen species like red spruce (Picea rubens Sarg.).
  • Understanding physiological responses to fluctuating winter temperatures is crucial for predicting forest health and survival.

Purpose of the Study:

  • To investigate the physiological effects of continuous thaw (CT) versus freeze-thaw cycles (FN) on red spruce seedlings during mid-winter.
  • To determine the temporal relationship between gas exchange, xylem pressure potential (XPP), and cold hardiness under different thaw regimes.

Main Methods:

  • Red spruce seedlings were subjected to CT or FN conditions for 8 days in mid-winter.
  • Measurements included net photosynthesis, respiration, leaf conductance, xylem pressure potential (XPP), and cold hardiness.

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  • Physiological parameters were assessed at various time points throughout the 8-day treatment period.

    • Main Results:

    • Continuous thaw (CT) seedlings exhibited higher respiration, net photosynthesis, leaf conductance, and XPP compared to freeze-thaw (FN) seedlings after 48 hours.
    • CT seedlings showed significantly reduced cold hardiness after 4 days, while FN seedlings maintained their cold tolerance.
    • The transition to positive net photosynthesis was linked to increased XPP, not solely stomatal conductance, and temporal offsets existed between gas exchange and cold hardiness changes.

    Conclusions:

    • Continuous thaw negatively impacts red spruce seedling physiology and cold hardiness.
    • The physiological linkage between gas exchange and cold hardiness during thaw is likely indirect due to temporal offsets.
    • Freeze-thaw cycles appear to maintain cold tolerance in red spruce seedlings more effectively than continuous thaw.