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Genetic Diversity of New Almond Accessions from Central Asian and Cold-adapted North American Germplasm

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Title Genetic Diversity of New Almond Accessions from Central Asian and Cold-adapted North American Germplasm
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Creator Per McCord
Vishal Singh
Amita Kaundal
Teryl Roper
 
Subject discriminant analysis
hierarchical clustering
plant genetic resources
principal components analysis
Prunus dulcis
 
Description Not Available
We evaluated the genetic diversity of a newly available collection of 94 almond [Prunus dulcis (Mill.) D.A.
Webb] accessions from the former Improving Perennial Plants for Food and Bioenergy (IPPFBE) Foundation. Most
of the collection (87 accessions) were collected as seeds from trees growing in the central Asian nations of Kyrgyzstan,
Tajikistan, and Uzbekistan, and included several examples of Prunus bucharica (Korsh.) Hand.-Mazz, and related
wild species. Of the remaining accessions, six were sourced from a nursery in northern Utah in the United States,
and one was a seedling of ‘Nonpareil’, a major commercial cultivar. DNA fingerprints were generated from 10 simple
sequence repeat markers. To evaluate the comparative diversity of these new accessions, 66 accessions from the US
Department of Agriculture, National Plant Germplasm System (NPGS) almond germplasm collection near Davis,
CA, USA, were also included. These NPGS accessions were chosen to represent those collected in similar regions of
Central Asia and the Caucasus. The fingerprints were analyzed via hierarchical clustering, principal components
analysis (PCA), and discriminant analysis of principal components (DAPC). Hierarchical clustering suggested that
half of the Utah-sourced accessions are closely related to each other and to the ‘Nonpareil’ seedling. Additional close
relationships were detected (including at least one duplication or mislabeling), and two P. bucharica accessions from
the IPPFBE collection were separated from the rest of the collection. A plot of the first two principal components
clearly separated wild almond relatives (P. bucharica and Prunus fenzliana Fritsch) from the remaining accessions.
PCA after removal of the wild species separated the ‘Nonpareil’ seedling, the Utah-sourced accessions, and many of the
IPPFBE accessions (mostly from Uzbekistan) from nearly all other individuals. The third principal component identi-
fied an additional population structure that separated groups of predominantly IPPFBE or NPGS accessions. DAPC
showed a considerable admixture of accessions from Azerbaijan, and a little to no admixture of accessions from Georgia
and Tajikistan. These results suggest that central Asian/Caucasian almond germplasm is generally distinct from ‘Non-
pareil’ and its relatives, and that although there is overlap between the NPGS and IPPFBE collections from this region,
the IPPFBE collection does enhance the diversity of available almond germplasm.
Not Available
 
Date 2024-03-18T18:38:27Z
2024-03-18T18:38:27Z
2023-10-04
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/81659
 
Language English
 
Relation Not Available;
 
Publisher Not Available