A second marker enzyme in the genetics of pappus part numbers inMicroseris hybrid B87 (Asteraceae,Lactuceae) |
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Authors: | Konrad Bachmann Kenton L Chambers H James Price |
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Institution: | (1) Premedical Biology Program, University of Heidelberg, Im Neuenheimer Feld 504, D-6900 Heidelberg 1, Federal Republic of Germany;(2) Department of Botany, Oregon State University, 97331 Corvallis, OR, USA;(3) Department of Plant Sciences, Texas A&M University, 77843 College Station, TX, USA |
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Abstract: | CrossingMicroseris pygmaea (10 pappus parts) withM. bigelovii (5 pappus parts) results in hybrids with variable pappus part numbers between 5 and 10. Previous work has shown that a system of four additively acting genes determines the average pappus part numbers of these hybrids. In hybrid B87 two genes have a 10-determining and a 5-determining allele each, two others a 5-determining and a null (inactive or missing) allele. Genetic linkage of one of the latter with the enzyme geneEsterase-1 and the leaf shape genespatulate leaves has been demonstrated. Here we demonstrate linkage between one of the two 10-determining genes and the enzyme locusEsterase- Y/B. The genotypes in the pappus part system of many specimens can now be fully determined. This is a major advance for the analysis of the evolution of this additive polygenic system.Genetics of Pappus Part Numbers inMicroseris Hybrid B87, II.—Part I:Bachmann & al. 1981. |
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Keywords: | Angiosperms Asteraceae Lactuceae Microseris Canalized numbers additive polygenes evolutionary genetics pappus parts leaf shape isoenzymes |
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