Changes in Cultivar Reactions to Tungro Due to Changes in 'Virulence' of the Leafhopper Vector

Dahal, G.; Hibino, H.; Cabunagan, R. C.; Tiongco, E. R.; Flores, Z. M.; Aguiero, V. M.

doi:10.1094/phyto-80-659

Cited by 42 publications

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“…Many of them have antibiosis and antixenosis (non-preference) to N. virescens but have no resistance to RTBV and/or RTSV Hibino et al, 1987;Dahal et al, 1990a). After several years of intensive cultivation, the incidence of tungro in some of these cultivars has increased in Indonesia, Philippines and Thailand (Inoue & Ruy-Aree, 1977;Manwan et al, 1985;Dahal et al, 1990b). The change in cultivar reactions to tungro has been attributed to the development of vector populations 'virulent' to formerly resistant cultivars (Dahal et al, 1990b).…”

Section: Introductionmentioning

confidence: 99%

“…After several years of intensive cultivation, the incidence of tungro in some of these cultivars has increased in Indonesia, Philippines and Thailand (Inoue & Ruy-Aree, 1977;Manwan et al, 1985;Dahal et al, 1990b). The change in cultivar reactions to tungro has been attributed to the development of vector populations 'virulent' to formerly resistant cultivars (Dahal et al, 1990b). Population of N. virescens virulent to formerly vector-resistant cultivars can be obtained through selection for survival on the resistant cultivars (Cabunagan & Ling, 1982;Heinrichs & Rapusas, 1984, 1990Manwan et al, 1985;Kobayashi et al, 1983;Takita & Habibuddin, 1985).…”

Section: Introductionmentioning

confidence: 99%

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Population characteristics and tungro transmission by Nephotettix virescens (Hemiptera: Cicadellidae) on selected resistant rice cultivars

Dahal

Hibino

Aguiero

1997

Bull. Entomol. Res.

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Rice green leafhopper Nephotettix virescens (Distant) populations were collected in 1985 from fields planted with a leafhopper resistant rice, Onjza sativa cultivar IR64 in South Cotabato, Philippines. The populations were reared on IR64 for eight generations and tested on six cultivars, including susceptible TNI, moderately resistant IR26 and IR36, and resistant IR54, IR62, and IR64. Leafhoppers excreted larger amounts of basic honeydew, efficiently transmitted two tungro associated viruses, and showed greater population increase and lower nymphal mortality on all cultivars except IR62 than a greenhouse population reared on TNI. Nephotettix virescens were transferred and maintained on TNI, IR26, IR36, IR64, or a mixture of the four cultivars plus IR54 and IR56 in equal proportion. When the TNl-maintained colony was tested at the third generation, its feeding behaviour and tungro transmission rates on test cultivars were similar to those of the original population but amounts of basic honeydew excretion and the transmission rate on the resistant test cultivars were greatly reduced at the seventh or later generations. When the IR26-maintained colony was tested at the sixth, ninth, or 13th generation, it exhibited lower amounts of basic honeydew excretion on the resistant test cultivars but exhibited similar transmission efficiencies on other test cultivars. When the colonies maintained on IR36, IR64, or the cultivar mixture were tested similarly, their population characteristics and virus transmission efficiency were similar to the original population. These results indicate that N. virescens retain their 'virulence' to resistant cultivars when maintained on resistant cultivars, but quickly lose their 'virulence' when maintained on a susceptible cultivar. Colonies continuously reared on IR26, IR36 or IR64 showed 'cross-virulence' to many cultivars possessing a variety of genes for N. virescens resistance but often differed in feeding behaviour, virus transmission efficiency, and nymphal mortality on cultivars with the same genes for leafhopper resistance. Introductioncomposite disease caused by rice tungro bacilliform virus Tungro is the most important virus disease of rice, Oryza ( R T B V ) a n d r i c e t u n S r o spherical virus (RTSV) (Omura et al., sativa, in south and southeast Asia (Ling, 1972). It is a 1 9 8 3 )-R T B V a n d R T S V a r e transmitted in a semi-persistent manner by the leafhopper Nephotettix virescens (Distant)

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Population characteristics and tungro transmission by Nephotettix virescens (Hemiptera: Cicadellidae) on selected resistant rice cultivars

Dahal

Hibino

Aguiero

1997

Bull. Entomol. Res.

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“…However, the designation of most of these strains was made before it was recognized that tungro was a complex of two viruses. Studies which indicate that rice cultivars react differentially to RTBV and/or RTSV, and express variable symptoms depending on single or double infection by these viruses (Hibino et al, 1987(Hibino et al, , 1990Dahal et al, 1990b) also confuse the recognition of strains. Recently, two variants (strains) of RTSV have been recognized in the Philippines using their reaction in rice cultivar TKM6 and four strains of RTBV have been recognized from their symptoms in cultivar FK135 Cabauatan et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Variation in the genome of rice tungro bacilliform virus: molecular characterization of six isolates

Fan

Dahal

Dasgupta

et al. 1996

Journal of General Virology

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The DNA genomes of isolates office tungro bacilliform virus from Bangladesh, India, Indonesia, Malaysia and Thailand were cloned and compared with that of the type isolate from the Philippines. Restriction endonuclease maps revealed differences between the isolates and cross-hybridization showed that they fell into two groups, those from the Indian subcontinent and those from south-east Asian countries. The genomes of isolates from the Indian subcontinent contained a deletion of 64 bp when compared with those from south-east Asia. The implications of this variation are discussed.

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“…Many cultivars bred as tungro-resistant had resistance to GLH (Rapusas and Heinrichs, 1982;Heinrichs and Rapusas, 1983;Hibino et al, 1987) and did not last long (Inoue and RuyAree, 1977;Manwan et al, 1985;Hibino et al, 1987;Dahal et al, 1990). High yielding cultivars with resistance to tungro have succumbed after a few years of intensive cultivation in Indonesia (Manwan et al, 1985;), Philippines (Hibino et al, 1987;Dahal et al, 1990) and Thailand (Inoue and Ruy-Aree, 1977). For this reason, it is pertinent to identify varieties with higher tolerance or high recovering ability.…”

Section: Rainfed Lowland Ricementioning

confidence: 99%

Recovering Ability of Upland and Rainfed Lowland Rice Varieties against Rice Tungro Disease

Khatun

Rahman

et al. 2018

Bangladesh Rice J.

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Rice tungro is the most destructive and widespread among virus diseases found in almost all rice growing areas. In susceptible varieties, it causes 100% yield loss under favourable environmental conditions. Control of tungro disease by chemical applications is not effective and eco-friendly. Development of resistant variety against tungro is also difficult, because it is necessary to develop resistance either to the insect vector or to the virus or to the both. Identification of varieties with recovering ability will facilitate farmers to cultivate rice in tungro endemic areas. Bangladesh Rice Research Institute released six upland and eight rainfed lowland rice varieties, which were tested to evaluate their recovering ability against tungro disease. The test varieties including susceptible and resistant checks were artificially inoculated by viruliferous vector (Green leafhopper, Nephotettix virescens) of ten days after seeding in net house condition. Among the tested varieties BR26, BRRI dhan33 and BRRI dhan40 were the most susceptible and showed high infection rate against tungro disease. BRRI dhan37 and BR8 showed the highest recovering ability in rainfed lowland and upland rice, respectively, with the lowest yield reduction compared to the resistant check Kumragoir, which could be used in tungro endemic areas. From these investigations, all the tested varieties expressed distinct tungro disease symptoms after three weeks of inoculation. With the advancement of plant growth, varieties BR8 and BRRI dhan37 recovered from tungro syndrome due to their genetic makeup consisting tolerance potentiality showed better yield, while other varieties like BRRI dhan33 and BRRI dhan40 did not produce any grain yield.

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Changes in Cultivar Reactions to Tungro Due to Changes in 'Virulence' of the Leafhopper Vector

Cited by 42 publications

References 0 publications

Population characteristics and tungro transmission by Nephotettix virescens (Hemiptera: Cicadellidae) on selected resistant rice cultivars

Population characteristics and tungro transmission by Nephotettix virescens (Hemiptera: Cicadellidae) on selected resistant rice cultivars

Variation in the genome of rice tungro bacilliform virus: molecular characterization of six isolates

Recovering Ability of Upland and Rainfed Lowland Rice Varieties against Rice Tungro Disease

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