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NADP-dependent aromatic alcohol dehydrogenase in polyploid wheats and their diploid relatives. On the origin and phylogeny of polyploid wheats

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Summary

The three major isoenzymes of the NADP-dependent aromatic alcohol dehydrogenase (ADH-B), distinguished in polyploid wheats by means of polyacrylamide gel electrophoresis, are shown to be coded by homoeoalleles of the locus Adh-2 on short arms of chromosomes of the fifth homoeologous group. Essentially codominant expression of the Adh-2 homoeolleles of composite genomes was observed in young seedlings of hexaploid wheats (T. aestivum s.l.) and tetraploid wheats of the emmer group (T. turgidum s.l.), whereas only the isoenzyme characteristic of the A genome is present in the seedlings of the timopheevii-group tetraploids (T. timopheevii s.str. and T. araraticum).

The slowest-moving B3 isoenzyme of polyploid wheats, coded by the homoeoallele of the B genome, is characteristic of the diploid species Aegilops speltoides S.l., including both its awned and awnless forms, but was not encountered in Ae. bicornis, Ae. sharonensis and Ae. longissima. The last two diploids, as well as Ae. tauschii, Ae. caudata, Triticum monococcum s.str., T. boeoticum s.l. (incl. T. thaoudar) and T. urartu all shared a common isoenzyme coinciding electrophoretically with the band B2 controlled by the A and D genome homoeoalleles in polyploid wheats. Ae. bicomis is characterized by the slowest isoenzyme, B4, not found in wheats and in the other diploid Aegilops species studied.

Two electrophoretic variants of ADH-B, B1 and B2, considered to be alloenzymes of the A genome homoeoallele, were observed in T. dicoccoides, T. dicoccon, T. turgidum. s.str. and T. spelta, whereas B2 was characteristic of T. timopheevii s.l. and only B1 was found in the remaining taxa of polyploid wheats. The isoenzyme B1, not encountered among diploid species, is considered to be a mutational derivative which arose on the tetraploid level from its more ancestral form B2 characteristic of diploid wheats.

The implication of the ADH-B isoenzyme data to the problems of wheat phylogeny and gene evolution is discussed.

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  1. Institute of Zoology and Botany, Academy of Sciences of the Estonian SSR, Tartu, Estonian SSR

    V. Jaaska

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Communicated by K. Tsunewaki

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Jaaska, V. NADP-dependent aromatic alcohol dehydrogenase in polyploid wheats and their diploid relatives. On the origin and phylogeny of polyploid wheats. Theoret. Appl. Genetics 53, 209–217 (1978). https://doi.org/10.1007/BF00277370

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  • DOI: https://doi.org/10.1007/BF00277370

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