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THE PLANT CELL, Vol 4, Issue 4 497-504, Copyright © 1992 by American Society of Plant Biologists
Heterochronic Effects of Teopod 2 on the Growth and Photosensitivity of the Maize Shoot
A. Bassiri, E. E. Irish and R. S. Poethig
Plant Science Institute, Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6018
Teopod 2 (Tp2) is a semidominant mutation of maize that prolongs the
expression of juvenile vegetative traits, increases the total number of
leaves produced by the shoot, and transforms reproductive structures into
vegetative ones. Here, we show that Tp2 prolongs the duration of vegetative
growth without prolonging the overall duration of shoot growth. Mutant
shoots produce leaves at the same rate as wild-type plants and continue to
produce leaves after wild-type plants have initiated a tassel. Although
Tp2/+ plants initiate a tassel later than their wild-type siblings, this
mutant tassel ceases differentiation at the same time as, or shortly
before, the primary meristem of a wild-type tassel completes its
development. To investigate the relationship between the vegetative and
reproductive development of the shoot, Tp2/+ and wild-type plants were
exposed to floral inductive short day (SD) treatments at various stages of
shoot growth. Tassel initiation in wild-type plants (which normally
produced 18 to 19 leaves) was maximally sensitive to SD between
plastochrons 15 and 16, whereas tassel branching was maximally sensitive to
SD between plastochrons 15 and 18. Tassel initiation and tassel morphology
in Tp2/+ plants (which normally produced 21 to 26 leaves) were both
maximally sensitive to SD between plastochrons 15 and 18. Thus, the
constitutive expression of a juvenile vegetative program in Tp2/+ plants
does not significantly delay the reproductive maturation of the shoot.
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