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New Mexico ( Leonian, 1922 ). This pathogen can completely devastate a field of chile peppers ( Sanogo and Carpenter, 2006 ). The pathogen causes multiple disease syndromes such as phytophthora root rot, fruit rot, stem blight, and foliar blight ( Sy

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Watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai] is a major vegetable crop in the world, accounting for 6.8% of the world area devoted to vegetable crops. Watermelon is a useful vegetable crop for genetic research because of its small genome size, and the many available gene mutants. The watermelon genes were originally organized and summarized in 1944, and have been expanded and updated periodically. However, the action of some watermelon genes has not been described clearly in some cases. Also, the interaction of multiple gene loci that control similar traits needs to be described more clearly. Finally, it is necessary to identify the inbred lines having each published gene mutant, for use as type lines in studies of gene action, allelism, and linkage. The objective of this work was to update the gene list, identify the cultivar or line having each gene mutant, and collect seeds of the lines for use by interested researchers. In addition, the gene descriptions were expanded and clarified, information on gene interactions was added, and errors in naming or citing previously described genes were corrected. New genes that have not previously been described (cr, Ctr, dw-3, ms-2, Ti, ts and zym-FL) were added to the list, for a total of 163 watermelon gene mutants.

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Studying the genetics of seedcoat color in common bean (Phaseolus vulgaris L.) in F2 progenies is very difficult because of complex epistatic interactions, and the analysis is complicated further by multiple allelism, especially at the C locus. An alternative approach is to study seedcoat genetics by analyzing the F1 progeny of test crosses between a variety with unknown seedcoat genotype and genetic tester stocks with known genotypes. Twenty varieties, 18 with known genotype at C, were test crossed with the genetic tester stock c u BC3 5-593, where 5-593 is a recurrent parent with seedcoat genotype P [C r] D J G B V Rk. The resulting F1 progenies were classified into seven phenotypic classes and discussed. The crosses g B v BC3 5-593 × c u BC3 5-593 and c u BC3 5-593 × v BC3 5-593 were made and the F2 progeny classified for flower color and seedcoat color and pattern. No tiny cartridge buff flecks were observed in the segregants with C/c u v/v, whereas C/c u V/- always showed such flecks. The contrasting seedcoat color expression at C in different environmental conditions is discussed.

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High levels of resistance to common bacterial blight caused by Xanthomonas campestris pv. phaseoli (Smith) Dye (Xcp) have been observed for tepary bean (Phaseolus acutifolius A. Gray var. latifolius Freeman). However, the inheritance of resistance from this source is unknown for many lines. The inheritance of common bacterial blight resistance was studied in four tepary bean lines crossed with the susceptible tepary bean MEX-114. Progenies were inoculated with a single Xcp strain 484a. Segregation ratios in the F2 generation suggested that resistance in Neb-T-6-s and PI 321637-s was governed by one dominant gene, and Neb T-8a-s had two dominant genes with complementary effects. These hypotheses for inheritance of resistance were supported by various combinations of F1, F3, BC1Pn segregation data in all lines except PI 321637-s where an additional minor-effect gene with recessive inheritance was indicated. Generation means analyses corroborated that multiple resistance genes were present in PI 321638-s. Lack of segregation for susceptibility among testcrosses for allelism between Neb-T-6-s/PI 321637-s, Neb-T-6-s/Neb-T-8a-s, PI 321637-s/Neb-T-8a-s, and PI 321637-s/PI 321638-s, suggested that one or more loci conditioning resistance to common bacterial blight were in common across the four tepary lines.

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Bassett (2007) wrote a comprehensive review of the genetics of seed-coat color and pattern in common bean ( Phaseolus vulgaris ). The gene loci T , P , and V have multiple alleles, which express pleiotropic effects on color and pattern in

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Multiple allelism is part of the evolutionary diversity in the animal and plant world. Gregor Mendel was the first to discover multiple allelic traits and allelic series in plants. This was the major and essential step to marker-assisted selection

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inheritance and allelism of many of these popular traits have been studied ( Roberts et al., 2015 ). For example, Roberts et al. (2015 ) demonstrated that purple leaves of ‘Ruby Falls’, ‘Forest Pansy’, and ‘Greswan’ were all controlled by the same recessive

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interspecific inbred lines with normal compatibility by varietal recombination among the three species and successive selection through different mating and selection methods. Meanwhile, some important traits such as plant habits, fruit types, multiple disease

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lines, each selected for resistance to both TYLCV and ToMoV over multiple seasons without the use of molecular markers, were used as donor parents to develop F 2 populations. Fla. 8753 is a fresh-market tomato with plum-shaped fruit that has a full vine

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al. 1976 ; Zink and Thomas 1990 ). Fom-3 confers resistance to races 0 and 2 in cultivar Perlita-FR, but allelism with Fom-1 is unclear ( Zink and Gubler 1985 ). At least three additional minor quantitative trait loci have also been characterized

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