CSB340H1 Study Guide - Midterm Guide: Plant Embryogenesis, Pin1, Pattern Formation
20 Nov 2012
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Lecture 5: mutations in the fass gene uncouple pattern formation and morphogenesis in arabidopsis development. Torres et al: fass gene recessive mutations in this gene alter the pattern of cell division from the zygote without interfering with pattern formation, affects cell elongation and orientation of cell walls but don"t interfere with polarity. These results suggest that the fass gene is required during post- embryonic development in a similar manner as embryogenesis. Fass mutants look highly abnormal at the heart stage but not all mutants defective at the heart stage are patterning mutants, but all patterning mutants are defective at the heart stage: polarity is important for pattern formation. Fass don"t undergo regular or stereotypic divisions, but patterns are still established. It"s not a cell by cell mechanism to lineage doesn"t seem to matter. In the wild type plant development, pattern formation and morphogenesis are coupled. Lecture 6: regulation of polar auxin transport by pin1 in arabidopsis.
