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Mark J. Bassett

The development of genetic tester stocks in common bean (Phaseolus vulgaris L.) for the partly colored seedcoat patterns `bipunctata BC3 5-593' (t z bip) and `virgarcus BC3 5-593' (t z) was described. The inheritance of the bipunctata pattern was studied in the F2 from the crosses `bipunctata BC1 5-593' × 5-593 and `bipunctata BC2 5-593' × 5-593. The data supported the hypothesis that a single recessive gene (bip) converts virgarcus (t z Bip) to bipunctata (t z bip). The inheritance of bipunctata was also studied in the F2 from the cross `bipunctata BC3 5-593' × `virgarcus BC3 5-593'. The data supported the hypothesis of complete dominance of Bip over bip in a t z genetic background highly related to the recurrent parent 5-593, where only the parental phenotypes appear in the F2.

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Paul D. Mangum and Ellen B. Peffley

Horizontal starch gel electrophoresis was used to study the inheritance of isozyme phenotypes of four enzyme systems [alcohol dehydrogenase (ADH), 6-phosphogluconate dehydrogenase (6-PGDH), phosphoglucomutase (PGM), and shikimate dehydrogenase (SKDH)] in Allium fistulosum L. by monitoring segregations in backcross and F2 progeny. Segregation for most of the polymorphisms fit the expected Mendelian ratios as tested by the chi-square statistic. Three new isozyme loci were defined for onion. Two loci were found for 6-PGDH. Locus one was dimeric with two alleles, and locus two was monomorphic. SKDH was monomeric with two alleles.

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Gregory C. Peterson and Leonard M. Pike

Fruit of TAMU breeding line 830397 are green in contrast to the cream or orange fruit of commercial cultivars at the mature-seed stage (MS-S). Inheritance of this trait for green MS-S fruit color in Cucumis sativus was investigated. A new locus, gn, is proposed as well as the elimination of the C locus. MS-S fruit color is controlled by two major genes, R and Gn. Fruit is orange when the genotype is R_ _ and green when the genotype is rrgngn. The cream MS-S fruit color trait is incompletely dominant over green, as the genotype rrGnGn is cream while rrGngn produces mature fruit from cream to intermediate in color between cream-colored and green fruit. Spine color is pleiotropic with or very tightly linked to the R locus, but heavy netting from PI 165509 appears not to be linked with the orange genotype and is polygenic.

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Mark J. Bassett, Kirk Hartel and Phil McClean

Inheritance of Anasazi pattern of partly colored seedcoats in common bean (Phaseolus vulgaris L.) was studied in a genetic stock t ana B V Anasazi BC3 5-593, whose Anasazi pattern is derived from Plant Introduction (PI) 451802. Line 5-593 is a determinate, Florida dry bean breeding line (with small black seeds) used as the recurrent parent in the development of many genetic stocks. The F2 from the cross t ana B V Anasazi BC3 5-593 × t z virgarcus BC3 5-593 segregated for two nonparental phenotypic classes and was consistent with the hypothesis that a single recessive gene, with tentative symbol ana, produces the Anasazi pattern with t Z ana and a new partly colored pattern Anabip with t z ana. Thus, the Anasazi factor is not an allele at the Z locus. Analysis of 57 random F3 progenies from the cross t ana B V Anasazi BC3 5-593 × t z virgarcus BC3 5-593 supported a genetic model where: 1) with t Z the Anasazi phenotype is controlled by a single recessive gene ana, i.e., genotype t Z ana, 2) the Anabip phenotype has the genotype t z ana, and 3) t Z/z ana produces a restricted Anasazi pattern. The allelism test cross t z ana Anabip BC3 5-593 × t z l ers white BC3 5-593 produced complementation in the F2, demonstrating nonallelism of Ana (actually Bip) with the L locus. The allelism test cross t z ana Anabip BC3 5-593 × t z bip bipunctata BC3 5-593 failed to show complementation in F1 and F2, demonstrating allelism of Ana with the Bip locus. Using bulk segregant analysis, molecular markers linked in coupling to the Ana (OM9200, 5.4 cM) and Bip (OJ17700, 6.0 cM) genes were discovered. Allelism was also suggested by the result that the same linkage distance and recombination pattern were observed when the Ana marker was used to score the bipunctata population. We propose the gene symbol bip ana for the recessive allele at the Bip locus that produces Anasazi pattern with genotype t Z bip ana and the Anabip pattern with genotype t z bip ana. Although bip ana and bip are both recessive to Bip, their interactions with the Z locus are extraordinarily different. The pattern restrictive power of bip ana expresses partly colored pattern with t Z, whereas bip requires t z to express partly colored pattern.

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Joseph N. Wolukau, Xiao-Hui Zhou, Ying Li, Yong-Bin Zhang and Jin-Feng Chen

, to determine the mode of inheritance to the GSB pathogen in other sources and possibly establish if these sources of resistance share the same genetic factors. The objectives of the present study were: 1) to critically examine the resistance of

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Rui Sun, Hui Li, Qiong Zhang, Dongmei Chen, Fengqiu Yang, Yongbo Zhao, Yi Wang, Yuepeng Han, Xinzhong Zhang and Zhenhai Han

-assisted breeding. Previously, the rate of flesh browning was determined to be higher in ‘Jonathan’ and lower in ‘Golden Delicious’ ( Kim et al., 1993 ). In the present study, to further understand the inheritance of the apple flesh browning trait, phenotypes of

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J.A. Beaver and A.F. Iezzoni

We acknowledge the Michigan Agricultural Experiment Station's support of this research. We also thank Dr. Steve Krebs for his instruction on starch gel electrophoresis and inheritance mode theory. The cost of publishing this paper was defrayed in

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Katrina J.M. Hodgson-Kratky and David J. Wolyn

higher rubber yields than spring-type plants ( Whaley and Bowen, 1947 ). Therefore, populations under development for high rubber are also selected for vernalization requirement and thus it would be useful to understand the inheritance of flowering habit

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Gabriele Gusmini and Todd C. Wehner

two preliminary studies on the inheritance of fruit weight, significant additive, dominance, and epistatic effects were reported, dominance and dominance-by-dominance being the largest gene effects ( Brar and Nandpuri, 1974 ; Sharma and Choudhury

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Mark J. Bassett and Phillip N. Miklas

or P . The P . coccineus variety ‘Painted Lady’ has bicolor flowers with a vermilion banner petal and pure white wings. The inheritance of vermilion flower color is not fully known, but the gene for salmon red flower, Sal , is certainly