Lec5 Flashcards
Plants can avoid stress after germination
T/F?
F, can’t
negative stress caused by high levels of a stressor
distress
caused by living organisms (fungi, bacteria, insects, herbivores, plants/competition..).
Biotic stress
is a physical (e.g., light, temperature) or chemical insult that the environment may impose on a plant
Abiotic stress
reduce the impact of a stress, even though the stress is present in the environment.
Avoidance mechanisms
requires that the organism exhibit the capacity to adjust or to acclimate to the stress.
Stress resistance
characterized by genetic changes in the entire population that have been fixed by natural selection over many generations.
Adaptation to the environment
process of acclimation to a stress
hardening
plants that have the capacity to acclimate
hardy species.
plants that exhibit a minimal capacity to acclimate to a specific stress
non hardy species
plant is in a homeostatic state indicated by a constant rate of some physiological process measured over time.
optimal environmental condition,
When can plant return to the original homeostatic state?
when the stress is removed
represent nonpermanent changes in the physiology or morphology of the individual that can be reversed if the prevailing environmental conditions change
phenotypic plasticity