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Mechanism of extreme genetic recombination in weedy Amaranthus hybrids

Published online by Cambridge University Press:  20 January 2017

Athertina N. Steinau ,
Daniel Z. Skinner  and
Martin Steinau
Athertina N. Steinau
Affiliation:
Kansas State University, College of Agriculture, Genetics Interdepartmental Program, Kansas State University, Manhattan, KS 66506
Martin Steinau
Affiliation:
Department of Plant Pathology, Kansas State University College of Agriculture, Kansas State University, Manhattan, KS 66506
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Abstract

Interspecific hybridization of Palmer amaranth and common waterhemp produce hybrids with unique DNA fragments not found in either parent. The objective of this research was to investigate the mechanisms involved in the formation of the polymorphic fragments. Six novel fragments were cloned and sequenced. Five of the six were significantly similar to plant transposons, the sixth was similar to squamosa promoter–binding proteins from other plant species. Southern blot analysis using one of the novel fragments as probe revealed a consistent pattern of repetitive DNA that was species and biotype specific. These results indicate that transposon-like elements may play an important role in the formation of new fragments in Amaranthus hybrids derived from interspecific hybridization, suggesting that considerable instability of the hybrid genome may occur.

Keywords

Common waterhemp, Amaranthus rudis Sauer AMATAPalmer amaranth, Amaranthus palmeri S. Wats. AMAPAInterspecific hybridpigweedtransposablesquamosa
Type
Weed Biology
Information
Weed Science , Volume 51 , Issue 5 , October 2003 , pp. 696 - 701
Copyright
Copyright © Weed Science Society of America 

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