ISHS Acta Horticulturae 903: IX International Symposium on Integrating Canopy, Rootstock and Environmental Physiology in Orchard Systems
SELECTING AND FINGERPRINTING THE NEXT GENERATION OF SIZE-CONTROLLING ROOTSTOCKS FOR SWEET CHERRY |
| Authors: | J.W. Olmstead, M.D. Whiting, A.M. Sebolt, A.F. Iezzoni |
| Keywords: | Prunus avium, fruit quality, vegetative growth, dwarfing |
| DOI: | 10.17660/ActaHortic.2011.903.29 |
| Abstract:
A rootstock selection program began at Michigan State University (MSU) in 1997 to identify dwarfing, precocious rootstocks from a pool of existing cherry germplasm. Ten rootstock selections were identified from an initial set of 91 candidates. Based on trunk cross-sectional area and measurement of lateral and terminal shoot extension, all but two selections were less vigorous than Gisela®6. All selections have equal or greater average fruit size with ‘Hedelfingen’ used as the scion cultivar. In addition, some of these rootstocks confer wide branch angles in the scion and reduce flower bud density compared to the Gisela® series that may be more suitable for highly productive cultivars. Polymerase chain reaction primer pairs that exhibited sufficient polymorphisms in fragment size to discriminate among the 10 rootstock candidates have been identified. These four primer pairs are PceGA59, PMS40, PMS67 and the S-locus RNase. With these markers the identity of each of the 11 rootstocks can be easily verified. | |
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