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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:
Head type (HEAD TYPE)
Download list of accessions evaluated for this trait
Definition:
Head type
Crop:
LETTUCE
Category:
Morphological descriptors
Status:
Crop Germplasm Committee approved
Data Type:
Alpha/numeric descriptor
Maximum Length:
4
Responsible Site:
Western Regional PI Station (
W6
)
Studies or environments
LETTUCE.2008.PULLMAN
38 Accessions
LETTUCE.2009.HELLIER.INCREASE
6 Accessions
LETTUCE.2010.SALINAS.HELLIER(1)
1187 Accessions
LETTUCE.2010.SALINAS.HELLIER(2)
279 Accessions
LETTUCE.2010.SALINAS.HELLIER(3)
138 Accessions
LETTUCE.2010.SALINAS.HELLIER(5)
18 Accessions
LETTUCE.2010.SALINAS.HELLIER(6)
5 Accessions
LETTUCE.2011.PULLMAN
33 Accessions
LETTUCE.2015.PULLMAN
19 Accessions
LETTUCE.HEADTYPE.YR.RYDER
82 Accessions
LETTUCE.OLD.DATA
328 Accessions
LETTUCE.PASSPORT.DATA
33 Accessions
LETTUCE.SINGLE.PLANT.SELECTION
285 Accessions
Distribution of Values for
Head type (HEAD TYPE)
Code
Definition
Number of Accessions
BUT
BUTTERHEAD
571
COS
ROMAINE
337
CRP
CRISPHEAD
387
LEF
LEAFY
480
MIX
MIXED
23
PRIM
Primitive
37
STM
STEM
32