Plant Genome II Conference
Town & Country Conference Center, San Diego, CA, January, 1994.
PG-II: MOLECULAR AND MORPHOLOGICAL MARKERS FOR A DWARFING GENE FROM
THE CITRUS ROOTSTOCK PONCIRUS TRIFOLIATA 'FLYING DRAGON'
MOLECULAR AND MORPHOLOGICAL MARKERS FOR A DWARFING GENE FROM
THE CITRUS ROOTSTOCK PONCIRUS TRIFOLIATA 'FLYING DRAGON'.
Frank Suozhan Cheng 1 and Mikeal L. Roose 2. l Department of
Horticullural Sciences, Cornell University, Geneva, NY 14456; 2
Department of Botany and Plant Sciences, University of
California, Riverside, CA 92521.
The 'Flying Dragon' cultivar of Poncirus trifoliata is a
dwarfing rootstock for citrus. It is also resistant to several
important diseases and pests. A population of self-pollinated
seedlings of 'Flying Dragon' was used to find markers for
dwarfing. Each progeny seedling was budded with 'Cutter
Valencia' orange and planted in the field to evaluate the
dwarfing effect of the seedling rootstock. Dwarfing effect was
determined by measuring trunk circumference at 5 years after
planting. The distribution of trunk circumferences was bimodal
with 31 dwarfing trees and 10 non-dwarf. This suggests that the
dwarfing effect of this rootstock is controlled by a single
dominant gene for which 'Flying Dragon' is heterozygous. Bulked
segregant analysis was used to identify 4 markers linked to the
dwarfing gene. Two morphological characteristics of 'Flying
Dragon', curved thorns and twisted trunk growth were closely
linked to, or pleiotropic effects of the dwarfing gene.
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