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United States Department of Agriculture
Agricultural Research Service
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Effective Jan. 1, 2025, the U.S. National Plant Germplasm System will modify its SMTA acceptance policy to distinguish between propagative and non-propagative germplasm.
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USDA National Plant Germplasm System
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Descriptor:
PLOIDY LEVEL (PLOIDY)
Download list of accessions evaluated for this trait
Definition:
Number of sets of chromosomes.
Crop:
PEAR
Category:
Cytological or cellular descriptors
Status:
Data Type:
Alpha/numeric descriptor
Maximum Length:
5
Responsible Site:
National Clonal Germplasm Repository (
COR
)
Studies or environments
PYRUS.PLOIDY.2007
102 Accessions
PYRUS.PLOIDY.2008
139 Accessions
PYRUS.PLOIDY.2012
490 Accessions
PYRUS.PLOIDY.2013
560 Accessions
PYRUS.PLOIDY.2014
47 Accessions
Distribution of Values for
PLOIDY LEVEL (PLOIDY)
Code
Definition
Number of Accessions
2.3x
aneuploid
1
2x
diploid
1170
2x/4x
tetraploid chimera
2
3x
triploid
87
4x
tetraploid
1