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Plant Physiol, April 2003, Vol. 131, pp. 1613-1622
Suppression of a Vegetative MADS Box Gene of Potato Activates
Axillary Meristem Development1
Faye M.
Rosin,
Jennifer K.
Hart,
Harry
Van
Onckelen, and
David J.
Hannapel*
Interdepartmental Program in Molecular, Cellular, and Developmental
Biology, Department of Horticulture, Iowa State University, Ames, Iowa
50011-1100 (F.M.R., J.K.H., D.J.H.); and University of Antwerp,
Universiteitsplein 1, B-2610, Antwerpen, Belgium (H.V.O.)
Potato MADS box 1 (POTM1) is a member
of the SQUAMOSA-like family of plant MADS box genes
isolated from an early stage tuber cDNA library. The RNA of
POTM1 is most abundant in vegetative meristems of potato
(Solanum tuberosum), accumulating specifically in the
tunica and corpus layers of the meristem, the procambium, the lamina of
new leaves, and newly formed axillary meristems. Transgenic lines with
reduced levels of POTM1 mRNA exhibited decreased apical
dominance accompanied by a compact growth habit and a reduction in leaf
size. Suppression lines produced truncated shoot clusters from stem
buds and, in a model system, exhibited enhanced axillary bud growth
instead of producing a tuber. This enhanced axillary bud growth was not
the result of increased axillary bud formation. Tuber yields were
reduced and rooting of cuttings was strongly inhibited in
POTM1 suppression lines. Both starch accumulation and
the activation of cell division occurred in specific regions of the
vegetative meristems of the POTM1 transgenic lines.
Cytokinin levels in axillary buds of a transgenic suppression line
increased 2- to 3-fold. These results imply that POTM1
mediates the control of axillary bud development by regulating cell
growth in vegetative meristems.
1
This is journal paper no. J-3701 of the Iowa
Agriculture and Home Economics Experiment Station, Ames (project no. 3703).
*
Corresponding author; e-mail djh{at}iastate.edu; fax
515-294-0730.
© 2003 American Society of Plant Biologists
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