| Given name + traits | Accession # + images + dates | Genetic data | OriginNOTE + collected | Ancestry | Other names + other # | Notes | ||
| # PI 639869 @ USDA-ARS (USA) INFO > GRIS | United States, North Dakota (developed) | other # = GRIS{PI-639869} | Remark: A genetic stock of durum wheat that is near-universally susceptible to wheat stem rust. Selected from a euploid BC1F3 plant having the parentage Langdon 4D(4B)/Line 47-1//Line 47-1. Derives its susceptibility to stem rust from Line 47-1 which has as its parents PI192334 and either Langdon or a Langdon aneuploid. PI192334 carries only a single thermosensitive gene that confers an intermediate infection type (IT) of 13 or 31 to pathotype, Pgt-LBBL, at low temperature (19-21EC), but an IT of 34 at temperatures above 21EC. Line 47-1 also carries this gene and this line was selected to eliminate this gene. Resembles Langdon for plant type (tall, late heading, similar spike morphology), but differs from Langdon for chaff color, having black chaff conferred by the Bg gene on chromosome 1A. Following its selection, it was included in additional trials to test thermosensitivity to Pgt-LBBL where plants were inoculated and grown under low (19-21EC) and high (21-28EC) temperatures. This line consistently had a susceptible reaction (IT 34) at both temperatures. In addition to trials with Pgt-LBBL, it has been tested for stem rust reaction to pathotypes Pgt-TPMK, -THTS, -TMLK, -TCMJ, -RTQQ, -MCCF, -QTHJ, -QCCJ, -HKHJ, and -JCMN, and was found to have a susceptible reaction (IT 34 or 4) to each pathotype. History: DEVELOPED 12/2004 North Dakota, United States by Klindworth, D., USDA-ARS; Miller, J., USDA-ARS; Xu, S., USDA-ARS-NCSL | |||||
