Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: July 7, 1995
Publication Date: N/A
Technical Abstract: Four recessive genes for morphological markers were mapped. The genes included two chlorina markers in mutants CDd1 and CDd6, the chocolate chaff (CC) gene, and the major supernumerary spikelet (SS) gene. The CC gene had previously been located to chromosome 7B, but not to a particular arm. The other three genes had previously been located to a chromosome arm. A cross of CDd1/CC indicated that these two genes segregated independently. Segregation in the LDN dimono 7BS/CC-CDd1 F2 located CC to 7BS. Parental marker lines were crossed to appropriate LDN dimonotelosomic or double ditelosomic plants. Doubletelotrisomic (13"+t1t''') F1 plants were backcrossed to the parental marker line, and testcross plants were classified for chromosome number and morphology. Percent recombination between each gene and the centromere was: 36.6+/-3.6 for the CDd6 gene in 7AL, 34.6+/-4.2 for the CDd1 gene in 7BL, and 29.2+/-4.0 for the CC gene in 7BS. Preliminary data indicates approximately 8.0 percent recombination between the SS gene and the centromere in 2AS.