Auxin gradients are associated with polarity changes in trees.
Models of plant growth and development propose that changes in cell polarity are mediated by gradients of the plant hormone auxin. With use of gas chromatography-mass spectrometry, we measured the redistribution of endogenous auxin in stems of quaking aspen trees (Populus tremuloides) after wounding. Persistent (lasting at least 24 hours) auxin gradients were observed in the region of the cambium where cell polarity was changing. A computer model of the auxin redistribution shows agreement with measured concentrations.
Physics Department, Bard College at Simon'sRock, Great Barrington, MA 01230, USA and Centre for Plant Integrative Biology at the University of Nottingham, UK. ekramer@simons-rock.edu [corrected]
Eric M
EM
Kramer
Michael
M
Lewandowski
Satvik
S
Beri
Jessica
J
Bernard
Matthew
M
Borkowski
Michael H
MH
Borkowski
Laura Ann
LA
Burchfield
Brenda
B
Mathisen
Jennifer
J
Normanly
D016764:Cell Polarity; D003198:Computer Simulation; D007210:Indoleacetic Acids / Q000378:metabolism*; D018519:Meristem / Q000166:cytology / Q000378:metabolism*; D008954:Models, Biological; D032107:Populus / Q000166:cytology* / Q000254:growth & development / Q000378:metabolism*; D014934:Wood / Q000166:cytology*
D007210:Indoleacetic Acids