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ADDITIONAL INDEX WORDS. Easter cactus, parentage verification, polyacrylamide gel electrophoresis ABSTRACT. Isozyme markers were used to identify cultivars and assess the genetic diversity within a germplasm collection of 49 Hatiora Britt. & Rose clones. The collection included accessions of Easter cactus ( H. gaertneri (Regel) Barthlott, H. ×graeseri Barthlott ex D. Hunt , and H. rosea (Lagerheim) Barthlott) plus H. herminiae (Campos-Porto & Castellanos) Backeberg ex Barthlott and H. salcornioides (Haworth) Britton & Rose. Seven enzyme systems were analyzed: aspartate aminotransferase, glucose-6-phosphate isomerase, leucine aminopeptidase, malate dehydrogenase, phosphoglucomutase, shikimate dehydrogenase, and triosephosphate isomerase. Thirteen loci and 42 alleles were identified. Twenty-one clones (43%) displayed unique isozyme profiles, but the remaining 28 clones shared isozyme profiles with one to three other clones. Percent polymorphic loci, mean number of alleles per locus, and mean heterozygosity were 69, 3.23, and 0.30, respectively, for the entire collection. Isozymes also proved useful for verifying that some progeny were genuine F 1 hybrids. growth habit. Identifying cultivars is difficult when plants are vegetative because there are few distinguishing features. Isozymes have been used for identifying cultivars in several crops (Nielsen, 1985; Weeden, 1989). The likelihood of identifying Hatiora clones by their isozyme phenotypes depends on the level of isozyme polymorphism within the germplasm. In a recent investigation, we identified six polymorphic isozyme loci in Easter cactus (O'Leary and Boyle, 1998a), and demonstrated that considerable isozyme variability exists in this crop. Isozymes can also be used to verify hybridity and assess the level of genetic variation in germplasm collections (Weeden, 1989; Yndgaard and Hoskuldsson, 1985). Therefore, the objectives of the present study were to 1) survey a diverse collection of Hatiora clones for seven enzyme systems and ascertain if isozyme phenotypes could be used to identify clones and 2) estimate the genetic diversity within the germplasm collection.

Cultivar Identification and Genetic Diversity within a Hatiora (Cactaceae) Clonal Germplasm Collection Using Isozymes