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Allotetraploid segregation for single-gene morphological characters in quinoa (Chenopodium quinoa} Willd.)

Allotetraploid segregation for single-gene morphological characters in quinoa (Chenopodium... Cytological evidence suggests the Andean grain crop quinoa is an allotetraploid, but in the few genetic studies which have been published a functionally diploid (disomic-monogenic) model has been assumed for segregation at individual loci in this species. In this study, controlled crosses using male sterile plants as female parents produced F1 and F2 generations segregating for three different single-gene morphological traits. Allelic segregation analysis revealed a range of F1 and F2 ratios indicative of both disomic-digenic and tetrasomic inheritance in two of these traits, as well as distorted F2 ratios suggesting erratic multivalent formation at meiosis. These results are consistent with allotetraploidy in quinoa, with functional alleles having been retained at some duplicate loci and at least some association occurring between homoeologous chromosomes. Tetrasomic segregation ratios observed in a minority of families may be due to reciprocal fragment exchange between homoeologues. The occurrence of tetraploid segregations at some loci in quinoa complicates breeding and genetic studies in the crop. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Euphytica Springer Journals

Allotetraploid segregation for single-gene morphological characters in quinoa (Chenopodium quinoa} Willd.)

Ward, Sarah
Euphytica , Volume 116 (1) – Oct 7, 2004
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References (19)

Publisher
Springer Journals
Copyright
Copyright © 2000 by Kluwer Academic Publishers
Subject
Life Sciences; Ecology; Plant Sciences; Plant Physiology
ISSN
0014-2336
eISSN
1573-5060
DOI
10.1023/A:1004070517808
Publisher site
See Article on Publisher Site

Abstract

Cytological evidence suggests the Andean grain crop quinoa is an allotetraploid, but in the few genetic studies which have been published a functionally diploid (disomic-monogenic) model has been assumed for segregation at individual loci in this species. In this study, controlled crosses using male sterile plants as female parents produced F1 and F2 generations segregating for three different single-gene morphological traits. Allelic segregation analysis revealed a range of F1 and F2 ratios indicative of both disomic-digenic and tetrasomic inheritance in two of these traits, as well as distorted F2 ratios suggesting erratic multivalent formation at meiosis. These results are consistent with allotetraploidy in quinoa, with functional alleles having been retained at some duplicate loci and at least some association occurring between homoeologous chromosomes. Tetrasomic segregation ratios observed in a minority of families may be due to reciprocal fragment exchange between homoeologues. The occurrence of tetraploid segregations at some loci in quinoa complicates breeding and genetic studies in the crop.

Journal

Euphytica – Springer Journals

Published: Oct 7, 2004

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