Phototropic responses including the bending of growing stems to sources of light with
blue wavelengths (460-nm range)
Plant Responses to Light: Phototropisms
Phototropisms are critical for determining how plants of different species grow together
in a pla
Plant Ecology
1. Plants dont exist in the world totally as individuals - they are in groups and
interact with each other and the environment
A. Population = groups of individuals at a specific place and time (55.2)
i. Environment limits distribution at la
Plant Defense
Physical Defenses:
Replacing the Leader
Physical Defenses
Plants Sustain Damage & Survive!
First Defense: Dermal Tissue
First Defense: Dermal Tissue
When the System Breaks Down . . . .
When the System Breaks Down . . . .
Induced chemicals ar
Carbon cycling: Fossil fuels
The Ecology of Climate Change
Historically, atmospheric CO2 maintained Earths temperature.
Humans are now increasing atmospheric CO 2
Because of the CO2 increase, global temperatures are rising
Temperature and CO2 Increase in
Climate Change
1. Climate change is a touchy, politicized topic but the data are
scientific and solid
A. The Greenhouse Effect has kept the earth warm for millennia.
i. Atmospheric CO scatters heat reflected from the earths surface in
2
all directions, tr
Sensory Systems in Plants
Responses to Light
Responses to Light
Plant Growth and Phytochrome
1. Seed germination
-Inhibited by far-red light and stimulated by red light in many plants
Plant Growth and Phytochrome
2. Shoot elongation
-Etiolation occurs
wh
A Primer of Plant Ecology
Plants form Populations
Plant Species are Limited to Specific Growing Environments
Geographic Ranges can Change!
Plant Species are Limited to Specific Growing Environments
Populations are Shaped by
Plant Life History Traits
Surv
Plant Sensory Systems
1. Plants have sensory systems that involve responses to the environment to
cellular processes.
A. Plant responses to light are largely a result of phytochrome pigments.
i. Interconvertable pigment tells the plant when to be biologic
Plant Stimuli Responses
1.
Plant defenses are responses of plants to sudden changes in their environment
A. Abiotic factors like wind, ice, temperature, weather can
damage plants i. Axillary buds of trees can grow
shoots to replace those broken
B. Other o
Abrupt changes in plant communities can usually be explained by abrupt change
in site (or disturbance).
Site is a good predictor of plant communities (but not perfect).
Plant Communities
Change over Time: Succession
Succession
Primary succession = new ve
