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Arsenic Tolerant Rice Variety Development in Bangladesh

Md. Abdul Mazid Miah
Principal Scientific Officer
Soil Science Division, BRRI

Abstract/ Executive Summary:

The study was conducted at BRRI Gazipur (5.6 mg/kg soil arsenic) and BRRI regional station, Bhanga (18 mg/kg soil As) to screen rice varieties/lines for arsenic tolerance. A total of 42 genotypes comprising BRRI varieties for Boro season were tested. The content of As in root samples increased at maturity stage than that of maximum tillering stage. However, straw As content remained more or less same in the two growth stages in both sites. In Bhanga the average content As of root was 426 mg/kg and in straw was 4.75 mg/kg which was about 8-10 times higher than Gazipur site. As content in grain samples of Bhanga site was higher than that of Gazipur site. Polishing and cooking decreased the As content from that of brown rice in both sites. However, it was interesting to note that parboiling did not decrease rather increased As content than un-parboiled polished rice.

Keywords: Arsenic, Bhanga soil, Parboiled rice

Location: BRRI farm, Gazipur & BRRI regional station, Bhanga

Start Date: 01-07-2005

End Date:

Program Area: Variety and Species

Commodity: Rice

Objectives:

To screen rice varieties/lines for arsenic tolerance

Methodology:

The study was conducted at BRRI Gazipur and BRRI regional station, Bhanga in 2005-06. A total of 42 genotypes comprising BRRI varieties for Boro season, popular varieties grown in Arsenic (As) prone area (Bhanga, Faridpur), IRRI NPT lines purified in Bangladesh and some varieties provided by IRRI were tested in this purpose. The trial was conducted in soil As content 5.6 mg/kg at BRRI farm Gazipur) and 18 mg/kg at BRRI RS Bhanga. Arsenic content of the irrigation water was 245 and 2 µg/l in Bhanga and Gazipur, respectively. The experimental design was RCB with two replications. Root, shoot grain and straw were collected at maximum tillering and maturity stage. Grain samples were dehasked, parboiled and un-parboiled, polished and cooked (both parboiled and un-parboiled) to estimate As content from each type of samples. Samples were digested in tri-acid and analysed in atomic absorption spectrometer equipped with flow injection hydride generation system.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2005-2006

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded that arsenic content is higher in root of rice, than straw and grain.

Knowledge Management: Report/Proceedings