Summary
An isoenzyme survey of some taxa in the genus Lotus (Fabaceae) was undertaken to increase the number of genetic markers available to breeders and to students of Lotus phylogeny. Twenty-one enzymes were examined using starch gel electrophoresis and nine buffer systems. Clear, consistent banding patterns were obtained for PGI, TPI, MDH, IDH (NADP), PGM, 6-PGDH, and ME. Clear but inconsistent banding patterns were obtained for FDP, G3PDH (NADP), β-EST, LAP, MDH, DIA, and NADHDH. Phenotypes of the seven consistently resolved enzyme systems were obtained for different tissues for each of several genotypes at different stages of development. Variation in enzyme phenotypes of the same individuals under different growth conditions indicated the presence of different isozymic forms of these enzymes. Shoot tissue of plants over 6 weeks of age was found to be suitable material for further genetic studies, since phenotype for this tissue was constant despite changes in growing conditions. A formal genetic analysis of segregation and/or recombination of allozymes for the enzymes PGM, TPI, MDH, IDH, and 6-PGDH was undertaken. Isoenzyme phenotypes were examined for the diploids L. alpinus Schleich., L. burttii Sz. Borsos, L. conimbricensis Brot., L. ornithopodioides L., L. tennis Waldst. et Kit., and L. uliginosus Schkuhr; and for the diploid interspecific hybrids L. alpinus x L. conimbricensis, L. burttii x L. ornithopodioides, and L. japonicus x L. alpinus. Several new loci were identified for Lotus, namely, Idh1, Idh2, Mdh3, Pgi1, Pgi2, Tpi1, Tpi2, and 6-Pdgh1. Duplications of loci of IDH, MDH, PGI, and 6-PGDH were detected in the diploid (2n=12) interspecific hybrid L. japonicus x L. alpinus.
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Communicated by H. F. Linskens
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Raelson, J.V., Grant, W.F. An isoenzyme study in the genus Lotus (Fabaceae). Experimental protocols and genetic basis of electrophoretic phenotype. Theoret. Appl. Genetics 77, 595–607 (1989). https://doi.org/10.1007/BF00274286
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DOI: https://doi.org/10.1007/BF00274286