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UID:20250625T140643EDT-7154eXvAn6@132.216.98.100
DTSTAMP:20250625T180643Z
DESCRIPTION:'Control of growth in plant cells through kinetic and mechanica
 l microtubule organization'\n\nEric Cytrynbaum (University of British Colu
 mbia)\n	Tuesday October 16 2018\n	McIntyre Building\, Room 1027\n\nAbstract:
  In growing plant cells\, parallel ordering of microtubules (MTs) along th
 e inner surface of the cell wall/membrane influences the direction of cell
  expansion and hence plant morphology in general. In stem and root cells\,
  for correct expansion\, MTs must bend in high-curvature directions along 
 the cylindrically shaped cell wall/membrane in order to form the required 
 circumferential arrays. Previous studies\, which recapitulated the self-or
 ganization of these arrays\, ignored MT mechanics and assumed MTs follow g
 eodesics of the cell surface. Here\, we show\, through analysis of a deriv
 ed Euler-Lagrange equation\, that an elastic MT constrained to a cylindric
 al surface will deflect from high to low curvature directions to minimize 
 bending energy as it grows but only at low anchor density. At high anchor 
 density\, MTs follow geodesics. This result justifies the previous self-or
 ganization results for arrays in growing stem and root cells at high ancho
 r density but predicts incorrect array orientation at low anchor density i
 n those cells. It also provides a mechanism by which cells\, in general\, 
 can regulate array orientation and hence growth and is consistent with exp
 eriments on mutant plants that have modified MT anchoring dynamics and mis
 oriented arrays.\n
DTSTART:20181016T160000Z
DTEND:20181016T170000Z
LOCATION:Room 1027\, McIntyre Medical Building\, CA\, QC\, Montreal\, H3G 1
 Y6\, 3655 promenade Sir William Osler
SUMMARY:Seminar Series in Quantitative Life Sciences and Medicine
URL:/qls/channels/event/seminar-series-quantitative-li
 fe-sciences-and-medicine-289848
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