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Effect of Black Point Disease on Quality on Wheat Grain

P. K. MALAKER
Principal Scientific Officer,
Wheat Research Centre, BARI, Dinjpur-5200

I. H. MIAN
Professor
BSMRAU, Gazipur-1706,

K. A. BHUIYAN
Professor
BSMRAU, Gazipur-1706,

M . M. A. REZA
Senior Scientific Officer
Wheat Research Centre, BARI, Dinajpur-5200

M . A. MANNAN
Senior Scientific Officer
Farm Division, BARI, Gazipur-170I, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted to determine the effect of different levels of black point infection caused by Bipolaris sorokiniana and other fungal pathogens on some quality characters of wheat grain . Wheat grains were graded on a 0-5 scale based on levels of black point infection. Quality characters of grain viz., protein, fat, dry matter, ash and mineral contents under different grades were determined following standard methods. The dry matter and ash contents of grain decreased while the contents of protein and fat increased with the increasing severity of black point infection. The observations on macro and micro nutrient contents of grain indicated that the amount of nitrogen, phosphorus, calcium , magnesium, sulphur, and boron increased, whereas the contents of potassium, iron, zinc, copper and sodium decreased with the increase of black point infection . However, the reductions in copper content of black point affected grains under different grades of infection were not significant as compared to apparently healthy grains.

Keywords: Black point, Bipolaris sorokiniana, Grain quality, Wheat.

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur

Start Date: 01-11-1999

End Date: 30-04-2000

Program Area: Pest Management

Commodity: Diseases

Objectives:

To determine the effect of different levels of black point infection on some important quality characters of wheat grain.

Methodology:

The experiment was conducted at Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during 1999-2000 crop season . Seeds of a popular wheat variety 'Kanchan' were obtained from the Wheat Testing Station, Bangladesh Agricultural Research Institute (BARI), Gazipur. The seeds were separated into six different grades on the basis of severity of black point infection. The grading was done according to 0-5 rating scale as suggested by Gilchrist (1985), where, Grade-0 =Grains free from any discolouration (apparently healthy); Grade-l =Tip of the embryo brown to blackish; Grade-2 = Discolouration covering the whole embryo; Grade-3 =Embryo with 1/4 of the grain discoloured; Grade-4 = Embryo with l/2 of the grain discoloured; Grade-5= Embryo with more than 1/2 of the grain discoloured and shrivelled. Quality characters viz., protein, fat, dry matter, ash, and mineral contents of wheat grains under different grades were determined. Dry matter and ash contents were measured following the procedures of Banerjee (1978). Protein and fat contents were determined following the methods of AOAC (Helrich, 1990). The mineral constituents of grains under different grades were assessed following the methods suggested by Hunter (1984). Data on different quality characters were analyzed statistically using MSTAT-C computer programme and means were compared by DMRT.

Source of Information: Bangladesh J . Agril. Res. 34(2): 181-187, June 2009. ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the present study, the essential macro and micronutrient contents of wheat grains were found to be either increased or decreased with the increase in infection grades of black point disease. Alterations in the contents of mineral constituents of black point affected grains were also reported by other workers (Chaudhary et al ., 1984; Dey et al., 1992).

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