Abstract
New white clover ( Trifolium repens L.) cultivars with improved winter hardiness and persistence are needed for pasture‐based cropping systems in temperate regions of North America. This study evaluated, quantified, and compared genetic variation of populations developed from five recently collected germplasms from Georgia (GA), Iowa (IA), Pennsylvania (PA), West Virginia (WV), and Prince Edward Island (PEI), Canada, and three improved cultivars (‘Regal’, ‘Sacramento’, and ‘Will’). ‘Aurora’ alsike clover ( T. hybridum L.) was included for comparison. Random amplified polymorphic DNA (RAPD) profiles of these populations were compared. Euclidean metric distance matrices were calculated for all possible pairwise combinations and were evaluated by analysis of molecular variance (AMOVA). An interpopulation distance matrix [Φ st , an analog of F as described by Excoffier et al. (1992)] for the nine populations was used to calculate a dendrogram based on the unweighted paired group method of arithmetic averages. As anticipated, alsike clover was separated from white clover. At a higher level of similarity, the white clovers were separated into only two groups. One group consisted of GA, IA, PA, and PEI germplasms collected from long‐established pastures. The second group included Regal, Sacramento, and Will cultivars and the WV collection. Although Will was originally derived from pasture collections, it has a larger leaf size than any of the five white clover collections. The surprising genetic similarities of eight populations derived from different climates and geographic regions of the continent may indicate a common European origin for much of the naturalized white clover in North American pastures.
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Claims 6
Claim · model-written summary
Alsike clover separated from white clover.
- Taxon
- white clover
Trifolium repense0 - Outcome
- separated from white clovere0
- Comparator
- alsike clovere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alsike clover was separated from white clover”
Claim · model-written summary
White clovers separated into two groups.
- Taxon
- white cloversTrifolium repense0
- Outcome
- separated into only two groupse0
- Value
- two groupse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“white clovers were separated into only two groups”
Claim · model-written summary
GA, IA, PA and PEI germplasms formed one group.
Not reportedTaxon
Verbatim
e0“One group consisted of GA, IA, PA, and PEI germplasms collected from long‐established pastures”
Claim · model-written summary
Regal, Sacramento, Will and WV formed the second group.
Not reportedTaxon
Verbatim
e0“The second group included Regal, Sacramento, and Will cultivars and the WV collection”
Claim · model-written summary
Will had larger leaves than the five collections.
- Taxon
- white cloverTrifolium repense0
- Material
- Wille0
- Outcome
- leaf sizee0
- Direction
- largere0
- Comparator
- five white clover collectionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Will was originally derived from pasture collections, it has a larger leaf size than any of the five white clover collections”
Claim · model-written summary
Similarity across eight populations may indicate a shared European origin.
- Taxon
- white cloverTrifolium repense0
- Material
- eight populationse0
- Outcome
- common European origine0
- Setting
- North American pasturese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genetic similarities of eight populations derived from different climates and geographic regions of the continent may indicate a common European origin for much of the naturalized white clover in North American pastures”