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SUMMARY:A thorny question: tinkering to evolve a novel mode of plant stem 
 cell arrest - Vivian Irish\, Yale University
DTSTART:20210204T130000Z
DTEND:20210204T140000Z
UID:TALK154570@talks.cam.ac.uk
CONTACT:85030
DESCRIPTION:In flowering plants\, the shoot apical meristem (SAM) consists
  of a few hundred stem cells that ultimately give rise to all shoot struct
 ures. This stem cell population continues to proliferate throughout vegeta
 tive development\, forming leaves and branches in an indeterminate fashion
 . In contrast\, thorns arise from vegetative SAMs that\, instead of mainta
 ining a stem cell fate\, switch from indeterminate to determinate growth\,
  resulting in terminal differentiation. Thorns appear to have arisen multi
 ple times during angiosperm evolution\, and are thought to have evolved as
  a protection against herbivory. Using Citrus as a model system\, we are e
 xploring the molecular mechanisms controlling stem cell proliferation and 
 arrest in thorns. The evolution of Citrus thorn identity appears to have r
 esulted from shifts in the timing and function of several gene regulatory 
 networks\, resulting in stem cell quiescence and concomitant terminal diff
 erentiation to produce the thorn. We hope to determine whether Citrus thor
 n development represents a novel mode of stem cell arrest\, or reflects th
 e redeployment of an ancestral mechanism to restrict stem cell proliferati
 on.\n\nContact reception@plantsci.cam.ac.uk for a Zoom link prior to a tal
 k if you are not on our mailing list. Due to having to go onine\, we are r
 estricting the talks to University of Cambridge and alumni to keep them as
  informal as possible.
LOCATION:Online
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