Reference "Resistance to infection of rice tungro viruses and vector resistance in wild species of rice (oryza spp)"

Reference ID

2150

Title

Resistance to infection of rice tungro viruses and vector resistance in wild species of rice (oryza spp)

Source

Japanese Journal of Breeding, 1993, vol. 43, pp. 377-387

Authors (4)

Kobayashi-N	Ikeda-R
Domingo-I-T	Vaughan-D-A

Abstract

Fifteen accessions of 8 species of wild rice (Oryza spp.), which were found to
be resistant to rice tungro bacilliform virus (RTBV) infection, were reexamined
to determine whether resistance was attributed to vector resistance. Of the 15
accessions, 3 of O. rufipogon (IRGC Acc. no. 105909, 105908 and 105910) showed
low or moderate level of antibiosis to the major vector Nephotettix virescens;
they were resistant to infection of tungro viruses, regardless of vector
resistance. Three accessions of O. officinalis (IRGC Acc. no. 105100, 105365 and
105376) showed high levels of antibiosis to N. virescens, but they showed low
levels of antibiosis to N. nigropictus. These O. officinalis accessions were not
infected with RTBV in the mass inoculation test and showed no or low percentage
of RTBV infection in the forced inoculation test by N. nigropictus. One O.
ridleyi accession (IRGC Acc. no. 100821) showed a moderate level of antibiosis
to N. nigropictus and no infection with RTBV in the mass inoculation test. These
results suggest that resistance to RTBV infection of these 7 accessions does not
depend on vector resistance. These wild rice accessions can be useful in
developing rice cultivars with high resistance to tungro.