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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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Descriptor:
CHILLING REQUIREMENT (CHILLUNITS)
Download list of accessions evaluated for this trait
Definition:
THE CHILLING UNITS REQUIRED TO BREAK DORMANCY
Crop:
PEAR
Category:
Production descriptors
Status:
Crop Germplasm Committee approved
Data Type:
Numeric descriptor
Maximum Length:
5
Responsible Site:
National Clonal Germplasm Repository (
COR
)
Studies or environments
PYRUS.STEBBINS.1991
24 Accessions
Distribution of Values for
CHILLING REQUIREMENT (CHILLUNITS)
Range
Number of Accessions
727 - 770
2
770 - 812
0
812 - 855
0
855 - 898
0
898 - 941
5
941 - 983
7
983 - 1026
0
1026 - 1069
0
1069 - 1111
0
1111 - 1154
10