CHILLING TEMPERATURES INJURE PLANTS (SLOW DEATH)
1) Increased protein and enzyme breakdown.
2) Increased membrane leakiness
a) membranes lose selective permeability
b) often appears deeper green and slightly waterlogged
1) Direct cellular damage - damage to individual cells.
rapid temperature drop
Moderate temperature drop
young tissue vs. old mature tissue
growing tissue vs. dormant tissue
flower buds vs. vegetative buds
roots vs. shoots
3) Frost heaving - soil freezes and expands, thus heaving the plant out of the soil.
4) Bark splitting - cambium under bark freezes, expands, then splits the bark.
5) Physical or mechanical breakage (ice damage) - from weight of ice on plant.
scald or Southwest injury - excessive desiccation on southwest
side of tree;