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Reaction of Barley Genotypes to Bipolaris Sorokiniana

M. M. RAHMAN
Plant Pathology Division, Bangladesh Agricultural Research Institute (BARI), Gazipur

A. K. M. M. ALAM
Pulses Research Centre (BARI), Gazipur

N. NAHER
Agricultural Botany Department, PSTU

S. M. SHARIFUZZAMAN
HRC (BARI),Gazipur 1701

M. A. N. UDDIN
Assistant Commisionar, Satkhira District, Bangladesh

Abstract/ Executive Summary:

A study on response of 29 barley genotypes resistant to Bipolaris leaf blight (Bipolaris sorokiniana) was conducted to investigate the relationship of the components of resistance of 29 barley genotypes. Data on five components of resistance viz., infection frequency (number of lesions per plant), lesion size (mm² ), percent leaf area affected by lesion, percent necrotic area on leaf, and disease severity were recorded as components of resistance. The genotypes fall into four clusters. Cluster I was to be the largest having 11 genotypes which was followed by cluster III, IV, and II. Considering the overall mean performances of different clusters, genotypes of cluster II showed better performance against resistance. From the canonical variate analysis, it was found that three components like lesion size, necrosis, and 100-seed weight were found positive for the both vector, and these characters contributed maximum towards the divergence for disease development of the barley accessions.

Keywords: Bipolaris sorokiniana, Barley, Leaf blight

Location: Bangladesh Agricultural Research Institute (BARI), Gazipur

Start Date: 00-00-2006

End Date: 00-00-2007

Program Area: Pest Management

Commodity: Barley

Objectives:

To investigate the components of resistance of the disease on seedlings of 29 barley genotypes and to classify them into genotypic groups based on those components.

Methodology:

The experiment was conducted in the field of Plant Breeding Division, Bangladesh Agricultural Research Institute (BARI), Gazipur during rabi 2006- 2007 with 29 genotypes. The experiment was in RCB design with three replications. Row to row spacing was 40 cm with continuous sowing. Each entry was 4 rows 2m long. A virulent isolate of Bipolaris sorokiniana was collected from the stock culture of Plant Pathology Division, BARI. At three-leaf stage, the seedlings were inoculated with freshly prepared B. sorokiniana conidial suspension containing 3,0000 spores/ml. Conidia were collected from 10 days old culture and Tween 20 was added to the suspension at 1 ml/litre to prohibit the spores from clustering. After inoculation, the seedlings were covered by a polyethylene for 72 hrs to ensure humidity. After 72 hrs of inoculation, data on five components of resistance viz. infection frequency (number of lesions per plant), lesion size (mm² ), percent leaf area affected by lesion, percent necrotic area on leaf, and disease severity (Mian, 1995) were recorded. Disease severity was indexed at 0-5 scale (Alam and Gustafson, 1988). Data on yield contributing characters were recorded from ten randomly selected plants and analyzed statistically. Genetic diversity in the barley accessions was analyzed following multivariate analysis. The techniques used in multivariate analysis were Principal component analysis, Principal coordinate analysis, Cluster analysis, and Canonical variate analysis. The multivariate analysis was performed using GENSTAT computer program.

Source of Information: Bangladesh J. Agril. Res. 36(1) : 123-128, March 2011, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The genotypes fall into four clusters. Cluster I was to be the largest having 11 genotypes which was followed by cluster III, IV, and II. Considering the overall mean performances of different clusters, genotypes of cluster II showed better performance against resistance. From the canonical variate analysis, it was found that three components like lesion size, necrosis, and 100-seed weight were found positive for the both vector, and these characters contributed maximum towards the divergence for disease development of the barley accessions.

Knowledge Management: Journal