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Genetic and morphological characteristics of an architectural mutant in common beans were studied. The mutant had shiny, dark green leaves, overlapping leaflets, short petioles and a terminal reproductive bud even though the line did not carry the  fin  gene. Branching was nearly absent, resulting in a single stem vine. This is a new form of determinancy in common bean. Inheritance studies demonstrated that the mutant trait was controlled by a single recessive gene. Allelism tests were performed between the mutant and a previously reported similar mutants, which were overlapping leaflets mutant ( ol ), and dark green savoy leaf mutant ( dgs ). Results showed that the mutant trait was not allelic to  ol  and  dgs . As a temporary designation, the name “”opiary” describing its compact and neat appearance is being used. Linkage was tested for growth habit ( fin ), shiny leaf, cross-sectional shape of pods, striped pod ( prp st  ) and pod suture strings ( st ) with the topiary mutant. No linkages were detected between either the mutant and marker genes or among the marker genes. The topiary mutant has potential for improving common beans. Its single stem growth habit may allow closer row spacing leading to higher planting populations and may enhance the efficiency of mechanical harvest. Pod formation at higher nodes may escape disease. Currently, the thin stems cause lodging. Development of thick and upright forms will be the subject of future studies.

038 Characterization of an Architectural Mutant of Bean (Phaseolus vulgaris L.)