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PLANT PHYSIOLOGY , Vol 109, Issue 3 861-870, Copyright © 1995 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Temperature Affects Expansion Rate of Maize Leaves without Change in Spatial Distribution of Cell Length (Analysis of the Coordination between Cell Division and Cell Expansion)
H. Ben-Haj-Salah and F. Tardieu
Institut National de la Recherche Agronomique, Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, 2 place Viala, 34060 Montpellier, France
We have analyzed the way in which temperature affects leaf elongation rate
of maize (Zea mays L.) leaves, while spatial distributions (observed at a
given time) of cell length and of proportion of cells in DNA replication
are unaffected. We have evaluated, in six growth chamber experiments with
constant temperatures (from 13 to 34[deg]C) and two field experiments with
fluctuating temperatures, (a) the spatial distributions of cell length and
of leaf elongation rate, and (b) the distribution of cell division, either
by using the continuity equation or by flow cytometry. Leaf elongation rate
was closely related to meristem temperature, with a common relationship in
the field and in the growth chamber. Cell division and cell elongation
occurred in the first 20 and 60 mm after the ligule, respectively, at all
temperatures. Similar quantitative responses to temperature were observed
for local cell division and local tissue expansion rates (common x
intercept and normalized slope), and both responses were spatially uniform
over the whole expanding zone (common time courses in thermal time). As a
consequence, faster cell elongation matched faster cell division rate and
faster elongation was compensated for by faster cell displacement,
resulting in temperature-invariant profiles of cell length and of
proportion of dividing cells. Cell-to-cell communication, therefore, was
not necessary to account for coordination.
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