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Fungi Associated with the Deep Water Aman Rice Straw

M. Sadeque Ali
Regtonal Agricultural Research Station BARI, Ishurdi, Pabna.

M. Jalaluddin
Department of Botany, University of Dacca, Bangladesh.

Abstract/ Executive Summary:

Both quantity and quality of mycoflora associated with Deep Water Aman (DWA) rice (Oryza sativa var, Indica) straw measuring 5 cms. in length were studied. The average fungal population of the straw samples was estimated to be 43,333 which included 18 species of 6 genera. The population of Aspergillus sp. was dominant followed by Penicillum sp., Trichoderma.'spp. and Rhizoctonia sp., Syncephalastrum sp, and Fusarium s p.

Keywords: Funji, Deep watrer aman rice straw, Associated

Location:

Start Date: 00-01-1970

End Date:

Program Area: Pest Management

Commodity: Rice

Objectives:

The present study aims at the qualitative and quantitative nature of fungi associated with the Deep Water Aman rice straw which may inoculate the soil during incorporation.

Methodology:

When the field was completely dry and the top part (about 40.60cms.) of the mature plant was harvested, the samples were collected from the remaining straw left in the field in January, 1970 from the Village Chandandhul, Munshigonj, Dacca in polythelene bags. Three straw samples each measuring 5 ems. in length, taken from basal, middle and upper portion of an individual straw, were cut .Department of Botany, University of Dacca, Bangladesh. aseptically. Serial Washing Method was followed to isolate the fungi from the straw lengths. Plating was done in PDA taking each time 1 m!. of the washing from each of the washings The plates were incubated at 30°C ± 1°C for 3.5 days and then the number of colonies were counted and finally the isolates were identified. The experiment was carried out at the Plant Pathological Laboratory, Department of Botany University of Dacca and was replicated 4 times.

Source of Information: Bangladesh J. Agril. Sci. 6 (1):111-113 : 1979

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In each straw sample measuring 5 cms, in length, the average fungal population was found to be 43,333. According to the report of Miah ( 1973 ), all the isolated fungi of this experiment Rhizoctonia sp. are saprophytes on rice. This indicates that the Deep Water Aman rice straw favors the growth of saprophytic microbial population. It may be due to non survival of pathogenic fungi on the dead plant parts. When rice straw was inoculated by rice stem rot organism, Helminthosporium sigmoideum, the pathogen failed to establish any infection (Annual report, IRRI, 1970). But' Rhizoc- tonia sp., the causal organism of rice sheath and culm blight was found associated with the Deep Water Aman rice straw. This suggests that during the straw incorporation, the soil may be inoculated by the pathogen. Seven different species of Aspergillus, five different species of Penicillum, three different species of Trichoderma and one species of each of Fusarium, Rhizoctonia and Syncephalastrum have been found associated with the Deep Water Aman rice straw. This fewer number of fungi may be due to the effect of a period of submergence of the straw. The submergence decreases the mycofloral number.

Knowledge Management: Journal