The Hybridization barrier between herbaceous Medicago sativa and woody M. arborea is weakened by selection of seed parents

Bingham, Edwin, Armour, David and Irwin, John (2013) The Hybridization barrier between herbaceous Medicago sativa and woody M. arborea is weakened by selection of seed parents. Plants, 2 2: 343-353. doi:10.3390/plants2020343


Author Bingham, Edwin
Armour, David
Irwin, John
Title The Hybridization barrier between herbaceous Medicago sativa and woody M. arborea is weakened by selection of seed parents
Journal name Plants   Check publisher's open access policy
ISSN 2223-7747
Publication date 2013
Year available 2013
Sub-type Article (original research)
DOI 10.3390/plants2020343
Open Access Status DOI
Volume 2
Issue 2
Start page 343
End page 353
Total pages 11
Place of publication Basel, Switzerland
Publisher M D P I AG
Collection year 2013
Language eng
Formatted abstract
Medicago sativa, alfalfa or lucerne, and M. arborea were considered reproductively isolated until recently. Then, in 2003, an alfalfa genotype was identified that produced a few seeds and progeny with hybrid traits after a large number of pollinations by M. arborea. A derivative of this alfalfa genotype also produced a low frequency of progeny with hybrid traits. Thus, the hybridization barrier was weakened by selection of seed parents. Hybrids from both events expressed traits from M. arborea and M. arborea-specific DNA bands, although more of the M. sativa genome was retained, based on the DNA results. Thus, there was chromatin elimination during embryogenesis, resulting in partial hybrids (hereafter hybrids). However, more than 30 hybrids with an array of M. arborea traits have been obtained thus far, and research continues on the nature of the hybrids. Traits have been genetically transmitted in crosses, and selected traits are in use for alfalfa breeding. This paper reviews the first hybrids and then focuses on further weakening of the hybridization barrier with the discovery of a more efficient hybridizer derived from crossing Medicago sativa subspecies, sativa, coerulea and falcata. This genotype was found to have reproductive abnormalities associated with its complex subspecies origin that are best described as hybrid breakdown. In effect, this subspecies derivative is a bridge-cross parent that consistently produces hybrids. Reproductive abnormalities in the bridge-cross parent are reported and discussed.
Keyword Species
Subspecies
Interspecific hybrids
Genetics
Genome shock
Hybrid Breakdown
Plant breeding
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Created: Thu, 30 Oct 2014, 16:19:13 EST by David Armour on behalf of Centre for Plant Science