BIOL 341 Lecture Notes - Photoinhibition, Antifreeze Protein, Rapeseed
19 Jun 2014
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Document Summary
Photosynthetic machinery damage: embedded in membrane, chloroplast membrane crystalizes, is damaged, membrane protein activity depends on fluid state of membrane , photo-inhibition when high light but cold, membrane modification (increase fluidity, osmolyte accumulation, gene expression changes. Reduce the freezing temperature, lower solute concentration. Plant defenses against cold: ca+2 fluxes again very important, signature differs form other stresses, triggers adaptive signal transduction cascades stresses related to drought. Imaging of ca2+ influx during cold: aquaporin-transformed, diff pattern of influx, correlated with increased tolerance. Ice crystal pictures: winter rye, wheat, barley can control growth if it has been cold activated only, maize can"t control ice. General classes of proteins associated with cold response. Antioxidant associated proteins: especially in pss or etc (pss/mitochondria) Antifreeze proteins: afp, slow growth ice crystals, apoplast. Transcription factors: mechanism in plasma membrane detects changes in fluidity tells downstream to make cold induced proteins, receptor.
