Genetic Linkage in Soybean: Linkage Group 14

Abstract

A more extensive genetic map i soybean [ Glycine max (L.) Merr.] would be useful in cytogenetic, genetic, and plant breeding studies. The efficiency of mapping studies can be increased by utilizing F 2 populations that segregate for morphological and biochemical markers. The objective of this study was to determine if a chlorophyll‐deficient mutant ( Y9 ) was linked to any of three other morphological traits and four biochemical markers. The morphological traits tested were root fluorescence ( Fr1, Fr3 ), hypocotyl color ( W1 ), and pubescence tip ( Pb ). The biochemical markers were seed coat peroxidase ( Ep ), isocitrate dehydrogenase ( Idh2 ), aconitase ( Aco4 ), and phosphoglucoisomerase ( Pgi2 ). Linkage was detected between Y9 and Pb , and the pooled recombination value was calculated to be 27.3 ± 1.1%, based on combined F 2 and F 3 data. No other linkages were detected. This represents a new linkage group (Linkage Group 14) in soybean.