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Reaction of Onion Mutants to Purple Blotch Disease Under Field Condition

M. K. Hasna
Plant Pathology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

H. A. Begum
Plant Pathology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Field experiments were conducted with 13 mutants of onion (M₄ and M₅) during the rabi season of 2010-11 and 2011-12 at the Bangladesh Institute of Nuclear Agriculture (BINA) farm, Mymensingh and its sub-station at Rangpur in order to find out the reaction of the mutants to purple blotch disease caused by Alternaria porri Ellis. The variety BARIpiaj-3 (mother) was used as the check. Seeds were sown in October and seedlings of 50-day old were transplanted in the field in rows. The disease severity of purple blotch was assessed at two months and two and half months, after transplanting when the disease was developed to its maximum extent. The mutant BP₂/75/2 showed moderately susceptible reaction to the disease in both the locations. The rest of the mutants and the check variety showed susceptible to highly susceptible reaction. None of the mutant of onion was found as resistant or moderately resistant against purple blotch disease.

Keywords: Alternaria porri, Onion, Purple blotch

Location: BINA farm Mymensingh and sub-station at Rangpur.

Start Date: 00-00-2010

End Date: 00-00-2012

Program Area: Pest Management

Commodity: Onion, Diseases

Objectives:

To evaluate the reaction of some mutants of onion to purple blotch under field condition at two agro-ecological zones of Bangladesh.

Methodology:

Thirteen mutants of onion derived from seeds of BARI Piaj-2 irradiated with 75 100 and 125 Gy of Gamma radiation were evaluated against purple blotch under field condition. The variety BARI Piaj-3 was used as the check. The materials were obtained from the Plant Breeding Division of the Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh. The experiments were conducted at BINA farm Mymensingh and its sub-station at Rangpur during the rabi season of 2010-2011 with M₄ population and 2011-2012 with M, population. The seeds were sown in October 2010 and 2011. Seed bed (3 m x 1.5 m) was prepared in loamy soil. Seeds (5 to 6 kg ha^-1) were sown in rows made 10 cm apart from each other. Seeds were covered by giving thin layer of soil. Beds were firs irrigated at 3 to 4 days interval and later on at 8 to 10 days interval. Seedlings became ready for transplanting within 45 to 50 days. Each year 50-day old seedlings were transplanted in the field following Randomized Complete Block Design with 3 replications. The row to row distance was 20 cm and plants were spaced at a distance of 15 cm within the rows. Fertilizers were applied @ Urea: 260 kg, TSP: 200 kg, MP: 150 kg per hectare. Intercultural operation were done as and when required. The disease severity of purple blotch was assessed a two months, and two and half months after transplanting when the disease was developed to its maximum extent.

Source of Information: Bangladesh Journal of Nuclear Agriculture. Vol: 30, pp: 51-55, ISSN 0258-7130, 2014

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present investigation indicated that onion of the mutant of onion was resistant to purple blotch disease. However, the mutant BP₂/75/2 was moderately susceptible to the disease in both the locations. However, the findings suggested for further research with these mutants of onion at different locations of Bangladesh and at artificial inoculation condition for the confirmation of the result.

Knowledge Management: Journal