Resistance in rice to multiplication of the two tungro viruses+

H. Habibuddin , I. B. Ahmad, A. M. Mahir, S. Jalani and T. Omura

Abstract

Multiplication of rice tungro bacilliform virus (RTBV) and rice tungro spherical virus (RTSV) in 14 rice varieties were studied. The sap from each plant was assayed for viral concentration by the enzyme-linked immunosorbent assay (ELISA) at 21 days after seedling inoculation. Mean absorbance or concentration values for RTBV of inoculated plants varied among varieties. The large values in TN1, IR42, MR 106 and MR 81 suggested the high susceptibility of these varieties to RTBV multiplication. The values were intermediate in Latisail, Basmati 370, MR 84, Habiganj DW8 and Y1036 and small in Utri Merah, Utri Rajapan and Balimau Putih. When sap samples of the inoculated Utri Merah and Balimau Putih were assayed at different weeks after inoculation, their ELISA values were consistently small, indicating low RTBV multiplication in the varieties. Inoculated plants of Basmati 370, Habiganj DW8, Kataribhog, MR 81, Pankhari 203, Utri Merah, Utri Rajapan and Y1036 gave extremely small mean absorbance values for RTSV, qualitatively uninfected, and failed to serve as inoculum sources, suggesting their resistance to RTSV infection. Balimau Putih which has low multiplication of both RTBV and RTSV is moderately efficient as an inoculum source.

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