Growth and Vegetative Development
Cousins, Peter , Prins, Bernard .
Vitis shoots show reversible change in leaf shape along the shoot axis.
Grapevine (Vitis) species typically bear entire leaves along the shoot axis once mature. A few species and selections are known to bear palmately compound leaves. Whether entire or compound, the shape of the leaf is essentially constant over the length of the shoot axis; the practices of ampelography and ampelometry, used to identify grapevine varieties, clones, and species, are based on leaf shape and rely on the relative stability of this character. Leaves on primary shoots may differ in shape from leaves on other shoots, demonstrating some plasticity in leaf shape among shoots. We examined primary shoots of grapevine species and species hybrids in the United States national grape collection at the USDA ARS National Clonal Germplasm Repository, Davis, California. Most accessions examined showed no substantial change in leaf shape along the shoot axis. However, some accessions exhibited compound leaves at the base of the shoot, followed by a zone of entire leaves, then a zone of compound leaves. Transition into the zone of entire leaves appears related to the unidirectional transition from leaf-opposed inflorescences to leaf-opposed tendrils. Genetic control of the reversible leaf shape change has not been determined, although the character is found only in specific selected populations. Leaf shape change along the shoot axis evokes shifts in leaf shape related to grapevine maturation and has implications for grapevine improvement and viticulture.
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1 - USDA Agricultural Research Service, Grape Genetics Research Unit, New York State Agricultural Experiment Station, Cornell University, 630 W. North Street, Geneva, NY, 14456, United States of America
2 - USDA Agricultural Research Service, National Clonal Germplasm Repository
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM