Dale Bumpers National Rice Research Center Site Logo
ARS Home About Us Helptop nav spacerContact Us En Espanoltop nav spacer
Printable VersionPrintable Version     E-mail this pageE-mail this page
Agricultural Research Service United States Department of Agriculture
Search
  Advanced Search
 
Programs and Projects
Subjects of Investigation
Germplasm Evaluation and Enhancement
Genomics Core Facility
Molecular Genetics
Molecular Plant Pathology
Molecular Biology
Cytogenetics
Weed Physiology
Cereal Chemistry
Rice Genetics and Breeding
 

Research Project: RESPONSE OF DIVERSE RICE GERMPLASM TO BIOTIC AND ABIOTIC STRESSES

Location: Dale Bumpers National Rice Research Center

Title: Effect of cultural management practices on the severity of false smut and kernel smut of rice

Authors
item Brooks, Steven
item Anders, Merle - UNIV. OF AR RREC
item Yeater, Kathleen

Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: July 14, 2009
Publication Date: November 1, 2009
Citation: Brooks, S.A., Anders, M.A., Yeater, K.M. 2009. Effect of cultural management practices on the severity of false smut and kernel smut of rice. Plant Disease. 93:1202-1208.

Interpretive Summary: False smut (Ustilaginoidea virens) and kernel smut (Neovossia horrida) are largely understudied diseases of rice (Oryza sativa) in the United States. Few assessments of disease resistance and G x E interactions have been performed, and the available information has been principally inferred from incidental experiments. Both diseases are significant and a need exists for their management, but since they are notoriously difficult to work with progress has been limited. In 2006 we began to evaluate the effects of crop management on rice smuts in order to determine G x E interactions, resistance in modern-relevant cultivars, and the optimal conditions to design dedicated smut nurseries. Using a long-term crop rotation experiment that has a history of natural smut infestation we determined the effects crop rotation, tillage and fertility on disease incidence. This study provided the means to harvest large amounts of smutted grain for inoculating two new nurseries that were designed using management strategies which would maximize disease incidence. Here we report the results of the 2006 and 2007 rotation study as well as the 2007 nursery data. We have identified management strategies to minimize smut incidence on susceptible cultivars and have discovered a source of resistance to kernel smut.

Technical Abstract: False smut and kernel smut are diseases of rice that reduce both grain yield and quality. False smut is an emerging disease worldwide that is rapidly gaining in importance, whereas kernel smut has historically been a chronic minor disease with sporadic outbreaks that cause considerable losses. Since both diseases are manifested as damaged rice grain they can be rated concurrently, but no source of resistance has been identified or deployed to control either disease on a production scale. This lack of progress toward improving variety resistance is primarily attributed to the inherent variability and difficulty in obtaining accurate disease ratings. This has resulted in the widespread release of smut susceptible rice varieties, and a need to manage these diseases on current varieties until useful sources of resistance can be identified. Herein we report an integrated approach that achieved disease control through cultural management and identification of resistant germplasm. By employing conservation tillage, continuous rice cropping, and moderating nitrogen fertility rates, we were able to achieve effective field resistance that nearly eliminated false smut from rice varieties which were fully susceptible under conventional cultivation practices. Furthermore, using a disease nursery designed to promote smut severity, two rice hybrids were identified that possessed kernel smut resistance under the most favorable disease conditions.

   

 
Project Team
Gealy, David
Jia, Yulin
Pinson, Shannon
McClung, Anna
McClung, Anna
Eizenga, Georgia
 
Publications
   Publications
 
Related National Programs
  Plant Genetic Resources, Genomics and Genetic Improvement (301)
  Crop Protection & Quarantine (304)
 
 
Last Modified: 05/22/2013
ARS Home | USDA.gov | Site Map | Policies and Links 
FOIA | Accessibility Statement | Privacy Policy | Nondiscrimination Statement | Information Quality | USA.gov | White House