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Diploid populations and progenies of controlled crosses of blueberry, Vaccinium section Cyanococcus, were analyzed by starch gel electrophoresis for nine enzyme systems, aconitase (ACO), aldolase (ALD), alcohol dehydro- genase (ADH), glyceraldehyde-3 -phosphate dehydrogenase (G-3 -PDH), isocitrate dehydrogenase (IDH), leucine ami- nopeptidase (LAP), malate dehydrogenase (MDH), 6-phosphogluconate dehydrogenase (6-PGD), and phosphoglucose isomerase (PGI). Allozyme variants indicated the existence of three alleles at Ace-1, Ald, G-3-pdh-2, and Mdh-2; four alleles at Mdh-3 and 6-Pgd-2; five alleles at Aco-2, Idh, Lap-1, and 6-Pgd-1; six alleles at Adh-2 and Pgm-2; and nine alleles at Pgi-2. In addition, a null allele was found at Lap-1. In the majority of progenies, the inheritance patterns for each of these loci were consistent with mendelian laws for single gene control. Forty-seven pairs of loci were tested for independent assortment revealing two linked pairs, Pgi-2/Lap-1 and Pgm-2/6-Pgd-2, which appeared to represent two independent linkage groups. An extensive survey and discussion of Vaccinium section Cyanococcus A. Gray in North America by starch gel electro- phoresis has revealed high levels of variability (Bruederle and Versa, 1989; Bruederle et al., 1991); 90% of the allozyme loci examined were polymorphic within the section. Inheritance studies, however, have been reported for only a few loci; Versa et al. (1988) presented evidence for mendelian inheritance at four loci among the enzyme systems malate dehydrogenase (EC 1.1.1.37; MDH) phosphoglucose isomerase (EC 5.3.1.9; PGI) 6-phosphogluconate dehydrogenase (EC 1.1.1.44; 6-PGD), and isocitrate dehydrogenase (EC 1.1.1.42; IDH); Krebs and Han- cock (1989) reported tetrasomic inheritance at four loci among the enzyme systems MDH, PGI, 6-PGD, and aspartate amino- transferase (EC 2.6.1.1). Evidence for the genetic basis of more isozyme phenotypes and knowledge of the linkage relationships among isozyme loci would be useful for future genetic and breeding behavior studies and provide information on linkage conservation. The Vaccinium section Cyanococcus karyotype consists of 12 metacentric or submetacentri c chromosomes (Hall and Galletta, 1971) that will potentially result in the develop- ment of maps for 12 linkage units. The purpose of this paper is to report: i) inheritance patterns at the diploid level for nine of the isozyme loci governing the enzyme systems aconitase (EC 4.2.1.3; ACO), alcohol dehy- drogenase (EC 1.1.1.1; ADH), aldolase (EC 4.1.2.13; ALD), glyceraldehyde-3 -phosphate dehydrogenase (EC 1.2.1.9; G-3- PDH), leucine aminopeptidase (EC 3.4.11.1; LAP) MDH, 6- PGD, and phosphoglucomutase (EC 2.7.5.1; PGM); (ii) linkage relationships among 13 of the loci governing these enzyme sys- tems as well as IDH and PGI; and (iii) allozyme variants ob- served at these loci in V. boreale Hall and Aalders, V. myrtilloides Mich., V. corymbosum L., V. pallidum Ait., V. tenellum Ait., and V. darrowi Camp. in order to update locus and allelic no- menclature in Vaccinium section Cyanococcus.

Inheritance and Linkage of Thirteen Polymorphic Isozyme Loci in Diploid Blueberry