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Plant Physiol, October 2000, Vol. 124, pp. 845-856
Can Meristematic Activity Determine Variation in Leaf Size and
Elongation Rate among Four Poa Species? A Kinematic
Study1
Fabio
Fiorani,*
Gerrit T.S.
Beemster,
Lieve
Bultynck, and
Hans
Lambers
Plant Ecophysiology, Sorbonnelaan 16, Utrecht University, 3584 CA
Utrecht, The Netherlands (F.F., L.B., H.L.); Laboratorium voor
Genetica, Departement Plantengenetica, Vlaams Instituut voor
Biotechnologie, Universiteit Gent, K.L. Ledeganckstraat 35, B-9000
Gent, Belgium (G.T.S.B.); and Plant Sciences, Faculty of Agriculture,
University of Western Australia, Nedlands, Western Australia 6907, Australia (L.B., H.L.)
We studied inherent variation in final leaf size among four
Poa spp. that live at different elevations. The average
final length of leaf 7 of the main stem of the smallest species
(Poa alpina) was only one-half that of the largest
species (Poa trivialis); it was correlated with leaf
elongation rate, but not with the duration of leaf elongation. A faster
rate of leaf elongation rate was associated with (a) larger size of the
zone of cell expansion, and (b) faster rates of cell production (per
cell file) in the meristem, which in turn were due to greater numbers
of dividing cells, whereas average cell division rates were very
similar for all species (except Poa annua). Also we
found that the proliferative fraction equaled 1 throughout the meristem
in all species. It was remarkable that rates of cell expansion tended
to be somewhat higher in the species with slower growing leaves. We
discuss the results by comparing the spatial and material viewpoints,
which lead to different interpretations of the role of cell division. Although the presented data do not strictly prove it, they strongly suggest a regulatory role for cell division in determining differences in growth rate among the present four Poa spp.
1
This work was funded by a PhD scholarship
granted by Utrecht University (to F.F.) and by a Marie Curie Training
and Mobility Research postdoctoral fellowship (grant no.
ERBFMI-CT97-2754 to G.T.S.B.).
*
Corresponding author; e-mail F.Fiorani{at}bio.uu.nl; fax
31-30-2518366.
© 2000 American Society of Plant Physiologists
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