Volume 50 Number 1 Article 5
Year 1996 Month 1
Title: Effects of Rootstock on Bud Development and Flower Formation of ´Starkspur Supreme Delicious` Apple
Authors: P.M. Hirst and D.C. Ferree
Abstract:
Studies were conducted on mature 'Starkspur
Supreme Delicious' trees growing on 17 rootstocks
in Wooster, OH to examine differences in
flowering and possible mechanisms for such
differences.
More dwarfing rootstocks had
higher spur densities, but the relationship was
weak.
Spur density had no effect on flower
density, but the proportion of spurs which
formed flowers was closely related to flower
density.
Doming of the bud apical meristem,
indicating a change to a floral state, only occurred after 20 appendages were present within
the bud, and this critical number of appendages
was constant across rootstocks and years.
The
timing of flower development was also unaffected by either rootstock or year.
No differences in phosphorus concentration in spur leaves
or in bud apical meristems were found among
rootstocks, indicating no direct effect of P on
flowering.
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