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Monitoring in International Disease Trap Nurseries of Wheat

K. Mustarin
Wheat Research Centre, BARI

P. K. Malaker
Wheat Research Centre, BARI

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

M. S. Hossain
Wheat Research Centre, BARI

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

M. M. Hossain
Wheat Research Centre, BARI

M.M. Rahman
Wheat Research Centre, BARI

M. Mokhlesur Rahman
Wheat Research Centre, BARI

R. Islam
Wheat Research Centre, BARI

M. A. Alam
Wheat Research Centre, BARI

M. A. Khan
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 (0-20S), but leaf rust was observed with varying severity (0-80S). 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.

Keywords: Trap nursery, Yellow rust, Stem rust, Leaf rust, Agro-climatic conditions

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

Start Date: 00-00-2013

End Date: 00-00-2014

Program Area: Pest Management

Commodity: Diseases, Wheat

Objectives:

The disease trap nursery were set up with the objectives to identify diseases, track pathogens and assess disease severity in wheat 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 through Nepal. The nurseries were planted in the research fields in five different locations: Dinajpur, Joydebpur, Jamalpur, Jessore and Rajshahi. Sowing was done in mid December according to the plan supplied for respective nurseries. The seeds of each entry were sown in 1 m long single row 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--2013-14

Article Link (Online Journal):

Funding Source:

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 severity. In the SAARC Nursery, leaf rust ranged from 0-40S, while it varied from 0-60S in International Yellow Rust Trap Nursery (8^th IYRTN), and 0-80S in International Leaf Rust Trap Nursery (5^th ILRTN) and International Stem Rust Trap Nursery (9^th ISRTN). Wide range of variability in leaf rust reaction and severity was observed on the near-isogenic lines and varieties with specific Lr genes included in the International Leaf Rust Trap Nursery (5^th ILRTN) (Table 3.9.2). 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 Lr3Ka and Lr37 showed 0-tMSS reactions, and the genes Lr14b, Lr18, Lr22a, Lr29, Lr30 and Lr32 displayed 5-20% severity with MR-MSS responses. Higher leaf rust severity was recorded in Rajshahi and Dinajpur compared to other locations.

Yellow rust was not found and stem rust was low, but leaf rust occurred with varying levels of severity. Majority of the specific leaf rust resistance genes showed moderately susceptible to susceptible reactions, while the genes Lr9, Lr19 and Lr28 were free from infection. Therefore, combinations of race-specific and adult plant resistance genes need to be utilized to develop genetic diversity of rust resistance and achieve sustainable disease control measure

Knowledge Management: Report/Proceedings