Class Notes (1,100,000)
US (450,000)
ISU (1,000)
BSC (200)
BSC 196 (50)
sakaluk (50)
Lecture 30

BSC 196 Lecture Notes - Lecture 30: Water Potential, Circadian Rhythm, Thigmotropism


Department
Biological Sciences
Course Code
BSC 196
Professor
sakaluk
Lecture
30

This preview shows half of the first page. to view the full 2 pages of the document.
The first lie of iue defese depeds o the plat’s aility to reogize pathogen-
associated molecular patterns (PAMPs)
These molecular sequences are specific to certain pathogens
PAMP recognition starts a chain of signaling events leading to the production of
antimicrobial chemicals and toughening of the cell wall
Pathogens that have evolved the ability to deliver effectors into plant cells can suppress
PAMP-triggered plant immunity
Effectors are pathogen-eoded proteis that ripple the host’s innate immune system
The hypersensitive response
Causes cell and tissue death near the infection site
Induces production of enzymes that attack the pathogen
Stimulates changes in the cell wall that confine the pathogen
Systemic acquired resistance causes systemic expression of defense genes and is a long-
lasting response
Methylsalicylic acid is synthesized around the infection site and carried in the phloem to
other remote sites where it is converted to salicylic acid
Excessive heat a deature a plat’s enzymes
Transpiration helps cool leaves by evaporative cooling
Heat-shock proteins help protect other proteins from heat stress
Cold temperatures decrease membrane fluidity
Altering lipid composition of membranes is a response to cold stress
Freezing causes ie to for i a plat’s ell walls ad iterellular spaes
Many plants, as well as other organisms, have antifreeze proteins that prevent ice crystals from
growing and damaging cells
Salt can lower the water potential of the soil solution and reduce water uptake
The photoreceptors responsible for the opposing effects of red and far-red light are
phytochromes
Circadian rhythms are cycles that are about 24 hours long and are governed by an internal
lok
Photoperiod is the environmental stimulus plants use most often to detect the time of year
Photoperiodism is a physiological response to photoperiod
Some processes, including flowering in many species, require a certain photoperiod
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version