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Effect of Seed Category as Affected by Bipolaris Sorokiniana on the Germination of Wheat Seeds

A. Sultana
Seed Pathology Center, Bangladesh Agricultural University, Mymensingh

A. Q. M. B. Rashid
Seed Pathology Center, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

An experiment was conducted under in-vitro condition to determine the effect of wheat seed categories such as healthy looking, blackpointed and shriveled as affected by Bipolaris sorokiniana on the germination of wheat seeds. The work was done in the laboratory of Seed Pathology Center, Bangladesh Agricultural University, Mymensingh during 2010-11. The highest prevalence (65%) of B. sorokiniana was recorded in shriveled seeds, (42%) was recorded in blackpointed seeds, and (30%) was associated with healthy looking seeds. The pathogen was responsible for the highest germination failure (87%) found in the category of shriveled seeds and then (35%) was found in blackpointed seeds while the healthy looking seeds showed (24%) germination failure. The result suggests that, the shriveled and blackpointed seed samples must be rejected, and after proper seed health test in an only the healthy looking seeds may be recommended for sowing through proper seed treatment.

Keywords: B. sorokiniana, Germination, Seed category, Wheat seed

Location: Seed Pathology Centre, Bangladesh Agricultural University

Start Date: 00-11-2010

End Date: 00-04-2011

Program Area: Pest Management

Commodity: Diseases

Objectives:

1. To explore the effect of the pathogen on the germination of various categories of wheat seeds.

Methodology:

Seed samples of widely cultivated wheat cultivar ‘Shatabdi’ were collected from Bangladesh Agricultural Development Corporation (BADC) and were tested in the Seed Pathology Centre, Bangladesh Agricultural University during the period from 2010-11.The collected seed samples were categorized as healthy looking, blackpointed and shriveled through dry inspection method. i. Apparently healthy looking seed - The seeds were morphologically normal in size and shape with usual smooth surface and natural bright color. ii. Blackpointed seed - The blackpointed seeds were with the characteristic black discoloration usually at around the embryonic region, usually showed rough surface and fade color. In some cases, the black discoloration extends beyond the germ end to ventral side or the sulcus, the most important harboring site of the pathogen. In severe cases, the whole grain was discolored and shriveled. The severity of blackpoint in seed was increased with the increase of infection. Higher leaf infection ultimately resulted more blackpointed seeds. iii. Shriveled seed - the shriveled seeds were usually small, deformed and of variable shapes and sizes with rough and black wrinkled surface. Seed health test was done by standard blotter method where the presence of pathogen was confirmed by observing under compound steriobinocular microscope.

Source of Information: J. Environ. Sci. & Natural Resources, 5(1): 113 - 116, 2012; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest prevalence (65%) of B. sorokiniana was recorded in shriveled seeds, (42%) was recorded in blackpointed seeds, and (30%) was associated with healthy looking seeds. The pathogen was responsible for the highest germination failure (87%) found in the category of shriveled seeds and then (35%) was found in blackpointed seeds while the healthy looking seeds showed (24%) germination failure. The result suggests that, the shriveled and blackpointed seed samples must be rejected, and after proper seed health test in an only the healthy looking seeds may be recommended for sowing through proper seed treatment.

Knowledge Management: Journal