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Nonhybrid Progeny from Crosses of Dioecious Amaranths: Implications for Gene-Flow Research

Published online by Cambridge University Press:  20 January 2017

Federico Trucco ,
Danman Zheng ,
Andrew J. Woodyard ,
Jared R. Walter ,
Tatiana C. Tatum ,
A. Lane Rayburn  and
Patrick J. Tranel
Federico Trucco*
Affiliation:
Instituto de Agrobiotecnología Rosario S.A., Córdoba 1452 P3 Of. E, Rosario, Argentina
Danman Zheng
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Andrew J. Woodyard
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Jared R. Walter
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Tatiana C. Tatum
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
A. Lane Rayburn
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Patrick J. Tranel
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
*
Corresponding author's E-mail: [email protected]
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Abstract

Large proportions of nonhybrid progeny result from controlled crosses between Palmer amaranth and common waterhemp, both dioecious weeds. Agamospermy was proposed as an explanation for this phenomenon, and here we provide evidence in support of this hypothesis. We evaluated 60 nonhybrid offspring from two interspecific crosses, and all plants were females and had DNA content values similar to the female (Palmer amaranth) parent. Among nine hybrids resulting from these crosses, eight were nonviable (lethal or neuter), and only one hybrid allowed for continued gene movement. Cytogenetic evaluation of this hybrid revealed triploidy, further supporting the occurrence of unreduced gametes in these species. In light of this new evidence, we examine earlier data regarding Palmer amaranth by common waterhemp hybridization and suggest some prior conclusions may be premature.

Keywords

Palmer amaranth, Amaranthus palmeri S. Wats. AMAPAcommon waterhemp, Amaranthus tuberculatus (Moq.) Sauer var. rudis (Sauer) Costea & Tardif AMATAAmaranthus rudisagamospermyrestitution gametestriploidy
Type
Research Article
Information
Weed Science , Volume 55 , Issue 2 , April 2007 , pp. 119 - 122
Copyright
Copyright © Weed Science Society of America 

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References

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