Field Screening of Bread Wheat for Partial Sources of Resistance to Stem Rust

Abstract: 
The stem rust Puccinia graminis tritici race ug99 (TTKSK) and its variants results into wheat grain losses ranging from 70- 100%. This study was set up at the Kenya Agricultural Research Institute (KARI), Njoro to identify sources of partial resistance to stem rust in Kenya. Twenty five wheat lines selected from 2008 international wheat screening nursery were grown in two replicates and screened for two seasons (December 2009 to March 2010 and then June to October 2010). Final rust severity (FRS), area under the disease progress curve (AUDPC) and the coefficient of infection (CI) were used to assess these lines for resistance. The wheat lines showed diversity in their responses ranging from trace to susceptibility. The line R07F4-21258 showed small chlorotic flecks and had no stem lodging. The entries 2, 3 and 20 had the least ACI, rAUDPC and rFRS values. These elite entries had the pseudo black potential sources of partial resistance to stem rust.
La rouille de la tige Puccinia graminis tritici race ug99 (TTKSK) et ses variantes ont comme conséquence les pertes de grains de blé allant de 70-100%. Cette étude a été effectuée à l’Institut de Recherche Agronomique du Kenya (KARI), à Njoro, pour identifier les sources de résistance partielle à la rouille de la tige au Kenya. Vingt-cinq lignées de blé sélectionnées à partir de la pépinière internationale de dépistage de blé de 2008 ont été cultivées en deux répétitions et observées pour deux saisons (de Décembre 2009 à Mars 2010, puis de Juin à Octobre 2010). La gravité finale de la rouille (FRS), la zone sous la courbe de progression de la maladie (AUDPC) et le coefficient d’infection (CI) ont été utilisés pour évaluer ces lignées de résistance. Les lignées de blé ont montré la diversité dans leurs réponses allant de la trace à la sensibilité. La lignée R07F4-21258 a montré de petites taches chlorotiques et n’avait pas de logement de la tige. Les entrées 2, 3 et 20 avaient les plus petites valeurs d’ACI, rAUDPC et RFRs. Ces entrées d’élite avaient les pseudo-sources potentielles noires de résistance partielle à la rouille noire.
Language: 
Extended Abstract for Crop Improvement
Date of publication: 
2012
Country: 
Region Focus: 
East Africa
Collection: 
RUFORUM Conferences and Workshops
Agrovoc terms: 
Licence conditions: 
Open Access
Form: 
Printed resource
Publisher: 
Notes: 

The 2012 RUFORUM Biennial Conference is the third in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholers in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. The third Biennial Conference was attended by 657 participants.  This record contains an extended abstract accepted under the theme of Crop Improvement.