Linkage Relationships of 19 Enzyme Loci in Maize

Abstract

Linkage relationships of 19 enzyme loci have been examined. The chromosomal locations of eight of these loci are formally reported for the first time in this paper. These localizations should assist in the construction of additional useful chromosome marker stocks, especially since several of these enzyme loci lie in regions that were previously poorly mapped. Six loci are on the long arm of chromosome 1. The arrangement is (centromere)—Mdh4-mmm-Pgm1-Adh1-Phi-Gdh1, with about 46% recombination between Mdh4 and Gdh1.—Linkage studies with a2 and pr have resulted in the localization of four enzyme genes to chromosome 5 with arrangement Pgm2-Mdh5-Got3-a2-(centromere)-pr-Got2. Pgm2 lies approximately 35 map units distal to a2 in a previously unmapped region of the short arm of 5, beyond ameiotic.—Approximately 23% recombination was observed between Mdh4 and Pgm1 on chromosome 1, while 17% recombination occurred between Mdh5 and Pgm2 on chromosome 5. Similarly, linkages between Idh1 and Mdh1, about 22 map units apart on chromosome 8, and between Mdh2 and Idh2, less than 5 map units apart on chromosome 6, were observed. Thus, segments of chromosomes 1 and 5 and segments of 6 and 8 may represent duplications on nonhomologous chromosomes.

Electrophoretic Characterization of Diploid Plums of the Southeastern United States

“…Both loci appear to code for monomeric enzymes, as reported with other plants (9,14). PGM-1 has double-banded electromorphs, as observed in Camellia (28), maize (13), balsam fir (21), and cole crops (4). One electromorph has bands at the relative positions of 89 and 78, and the other at 78 and 70.…”

“…Two virus source clones were used for inoculation, F. xananassa 'Totem' Puyallup clone 3 (FM5-3) and F. xananassa 'Totem' Mount Vernon clone (MV-1). Both clones were infected with a complex of mottle, mild yellow edge, and crinkle viruses (13). From 33 to 42 seedlings of each age were inoculated with each virus source, and 15 or 18 seedlings of each age were used as uninoculated controls.…”

Genetics and Linkage Analysis of 19 Isozyme Loci in Apple

“…Fragaria Xananassa, F. virginiana glauca, day-neutral strawberries, controlled environments, growth models Abstract. Variation in vegetative and reproductive growth patterns leading to summer flowering and fruiting was evaluated in everbearing and in representative Junebearing strawberry (Fragaria Xananassa The major dichotomy in flowering behavior in strawberry, that between Junebearers and everbearers, results from different daylength and temperature requirements for flower bud initiation (FBI) (2,6,7). Day-neutral, relatively temperature-insensitive everbearers initiate flowers from early summer through autumn and may bear several crops per year (9).…”

Inheritance of Five Isozyme Loci in Apricot

“…yThese are presumably 100/n. meric enzyme in plants, although its inher itance cannot always be inferred by its phenotype due to post-translational modifi cation of the protein, comigrating electromorphs, null alleles, and the presence of interlocus dimers (Arulsekar et al, 1986;Goodman et al, 1980;Cheliak et al, 1985). Phenotypes observed from peach are not eas ily interpreted as dimeric, and several studies have shown that the variation observed can be explained by the segregation of several alleles at one locus, although the origin of all the bands are not always explained (Arul sekar et al, 1986;Durham et al, 1987).…”