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The Journal of Heredity 2001:92(3)
© 2001 The American Genetic Association 92:271-274

Brief Communication

Inheritance and Subcellular Localization of Triose-Phosphate Isomerase in Dwarf Mountain Pine (Pinus mugo)

I. J. Odrzykoski

From the Department of Genetics, A. Mickiewicz University, 60–371 Poznan, Miedzychodzka 5, Poland.

Address correspondence to I. J. Odrzykoski at the address above or e-mail: ireko{at}main.amu.edu.pl.

Several trees with expected heterozygous phenotype for triose-phosphate isomerase (TPI) were discovered in a population of dwarf mountain pine (Pinus mugo Turra) from southern Poland. As the inheritance of this enzyme in pines has not been reported, segregation of allelic variants was tested in eight trees with putative heterozygous phenotypes for two loci, TpiA and TpiB. Linkage between these and some other isozyme loci were studied and evidence for linkage has been found between TpiA and PgdA (r = 0.10) and between TpiB and DiaD (r = 0.36), but in single trees only. The subcellular localization of TPI isozymes was determined by comparing isoenzymes from the total extract with those found in fraction enriched in plastids, prepared by differential gradient centrifugation of cellular organelles. The more slowly migrating TPI-B isozyme is located in plastids.


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