Plant Stresses Flashcards
Abiotic stress and examples
non living origins. nutrients, salt, cold, heat
salt stress
salty soils pull water out of plants
low temp stress
water in plants forms ice crystals and breaks cell walls
Perennials in low temps
go dormant
Winter burn
sunny days when the ground is still frozen, water evaporates out of leaves but cannot be replaced
High temp stress
cell proteins can coagulate (cooking an egg)
Wilting
plants unable to take up water consistently
Stomata typical operation
open during day, closed at night
Turgor pressure
pressure built up in the cells due to guard cell operation
Cuticle may be _______. Why?
waxy
to prevent moisture loss
Trichomes and functions
hairs of the leaf surface to prevent air from getting close to leaf and sucking water out, reflect solar radiation, taste bad to prevent being eaten
biotic stress
caused by a living organism
What makes something a weed
not being wanted. human decision
Why are weeds a problem in ag
competition, contamination, quality downgrade, dangerous
Why do weeds contaminate crop
weed seeds cant be separated from crop seeds. ex) wild and crop mustard in a sample
