Descriptor: STEM RUST INFECTION RESPONSE (STEMRUSTIR)



 
Definition:
Infection response to stem rust (caused by Puccinia graminis f.sp. tritici) in the adult plant stage. Growth stage is recorded in the Comment field. (See also related descriptor STEMRUSTSV.)
Crop:
WHEAT
Category:
Disease descriptors
Status:
Crop Germplasm Committee approved
Data Type:
Alpha/numeric descriptor
Maximum Length:
4
Responsible Site:
National Small Grains Collection (NSGC)

Distribution of Values for STEM RUST INFECTION RESPONSE (STEMRUSTIR)

CodeDefinitionNumber of Accessions
MRModerately Resistant, expressed as small uredinia.85
MRMSMR and MS infection responses on same stem with majority MR.168
MRSMR and S infection responses on same stem with S occurring at nodes.173
MSModerately Susceptible, expressed as moderately-sized uredinia, or large uredinia associated with extensive chlorosis.119
MSMRMS and MR infection responses on same stem with majority MS.21
MSSMS and S infection responses on same stem with majority MS.260
RResistant, expressed as absence of uredinia on stem and/or leaf sheath, or minute if present.2
RMRR and MR infection responses on same stem with majority R.25
SFully Susceptible, expressed as large uredinia.8865
SMSS and MS infection responses on same stem with majority S.1