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PLANT PHYSIOLOGY , Vol 109, Issue 2 499-504, Copyright © 1995 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
[beta]-Tubulin Accumulation and DNA Replication in Imbibing Tomato Seeds
R. D. de Castro, X. Zheng, JHW. Bergervoet, CHR. De Vos and R. J. Bino
Center for Plant Breeding and Reproduction Research, Department of Reproduction Technology, P.O. Box 16, 6700 AA Wageningen, The Netherlands (R.D.d.C., J.H.W.B., C.H.R.D.V., R.J.B.)
The activation of the cell cycle in embryo root tips of imbibing tomato
(Lycopersicon esculentum Mill. cv Lerica) seeds was studied by flow
cytometric analyses of the nuclear DNA content and by immunodelection of
[beta]-tubulin. With dry seeds, flow cytometric profiles indicated that the
majority of the cells were arrested at the G1 phase of the cell cycle. In
addition, [beta]-tubulin was not detectable on western blots. Upon
imbibition of water, the number of cells in G2 started to increase after 24
h, and a 55-kD [beta]-tubulin signal was detected between 24 and 48 h.
Two-dimensional immunoblots revealed at least three different
[beta]-tubulin isotypes. Thus, [beta]-tubulin accumulation and DNA
replication were induced during osmotic priming. These processes, as well
as seed germination rate, were enhanced upon subsequent imbibition of
water, compared with control seeds that imbibed but were not primed. By
contrast, when aged seeds imbibed, DNA replication, [beta]-tubulin
accumulation, and germination were delayed. In all cases studied, both DNA
replication and [beta]-tubulin accumulation preceded visible germination.
We suggest that activation of these cell-cycle-related processes is a
prerequisite for tomato seed germination. Furthermore, [beta]-tubulin
expression can be used as a parameter for following the initial processes
that are activated during seed imbibition.
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