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Monitoring in International Disease Trap Nursery of Wheat

P. K. Malaker
Wheat Research Centre, BARI

N.C.D. Barma
Wheat Research Centre, BARI

M. M. A. Reza
Wheat Research Centre, BARI

M. M. Hossain
Wheat Research Centre, BARI

K. MUSTARIN
Wheat Research Centre, BARI

M. F. Amin
Wheat Research Centre, BARI

R. Islam
Wheat Research Centre, BARI

M. N. A. SIDDQUIE
Wheat Research Centre, BARI

Abstract/ Executive Summary:

Four international disease trap nurseries were evaluated for their reactions to rust diseases under field condition. The nurseries were surrounded by spreader rows of susceptible varieties. Modified Cobb scale was used for scoring rust. Yellow rust was not found and stem rust occurred with low severity (0-5 S), but leaf rust was observed with varying severity (0-70 S). Moderately susceptible to susceptible reactions were displayed on majority of the lines with single leaf rust resistance gene, while the genes Lr9, Lr19 and Lr28 were free from leaf rust infection. The specific leaf rust resistance genes Lr9 and Lr19 and Lr28 were free from leaf rust infection in all the locations. Genes Lr2c, Lr3, Lr3bg, Lr10, Lr13, Lr17, Lr18, Lr23, Lr26, Lr(10, 27+31), Lr29, Lr30, Lr32, Lr33 and Lr34 showed low (0-20%) disease severity with different types of reactions. Higher leaf rust severity was recorded in Dinajpur and Jessore compared to rest other locations.

Keywords: Pathogen, Disease severity, Agro-climate, Wheat

Location: Dinajpur, Joydebpur, Jamalpur, Jessore and Rajshahi.

Start Date: 00-00-2014

End Date: 00-00-2015

Program Area: Pest Management

Commodity: Diseases, Wheat

Objectives:

To identify diseases, track pathogens and assess disease severity under the agro-climatic conditions of Bangladesh.

Methodology:

Four different disease trap nurseries were received from ICARDA-Syria under ICARDA-CIMMYT Wheat Improvement Program and from DWR-India under SAARC collaboration. The nurseries were planted in the research fields in five different locations namely Dinajpur, Joydebpur, Jamalpur, Jessore and Rajshahi. Sowings were done in mid December according to the plan supplied for respective nurseries. The seeds of each entry were sown in 1m long single/2-row plots with 30 cm spacing between entries. The nurseries were surrounded by spreader rows of susceptible varieties and exposed to natural condition of disease development. Recommended crop management practices were followed for normal plant growth. Modified Cobb scale (Stubbs et al. 1986) representing disease severity and reaction type was used for recording rust diseases.

Source of Information: Annual Research Report, Wheat Research Centre, BARI--2014-15

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Yellow rust was not found and stem rust occurred with low severity, but leaf rust was observed with varying levels of severalties. In the SAARC Nursery, leaf rust ranged from 0-5 S, while it varied from 0-70 S in International Leaf Rust Trap Nursery (6^th ILRTN), Disease reactions varied depending on the interactions between Lr genes and the virulence factors present in the existing leaf rust flora population in different locations. Majority of the single leaf rust resistance genes showed moderately susceptible to susceptible reactions. The specific leaf rust resistance genes Lr9 and Lr19 and Lr28 were free from leaf rust infection in all the locations. Genes Lr2c, Lr3, Lr3bg, Lr10, Lr13, Lr17, Lr18, Lr23, Lr26, Lr(10, 27+31), Lr29, Lr30, Lr32, Lr33 and Lr34 showed low (0-20%) disease severity with different types of reactions. Higher leaf rust severity was recorded in Dinajpur and Jessore as compared to other locations.

Knowledge Management: Report/Proceedings