Occurrence and Spread of Rice Tungro Spherical Virus in the Philippines

Bajet, N. B.; Aguiero, V. M.; Daquioag, R. D.; Jonson, Gilda; Cabunagan, R. C.; Mesina, E. M.; Hibino, Hiroki

doi:10.1094/pd-70-971

Cited by 19 publications

(4 citation statements)

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“…RTSV occurs widely and spreads independently in the Philippines (Bajet et al, 1986;Cabauatan and Hibino, 1984). Leafhoppers carrying RTSV alone have been detected in fields where no tungro disease symptoms were apparent.…”

Section: Introductionmentioning

confidence: 99%

“…Leafhoppers carrying RTSV alone have been detected in fields where no tungro disease symptoms were apparent. Leaf samples collected from these fields were positive for RTSV when tested serologically (Bajet et al, 1986). Although RTSV causes latent infection, greenhouse experiments have demonstrated that it can cause 20-40% yield loss (Hasanuddin and Hibino, 1989).…”

Section: Introductionmentioning

confidence: 99%

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Oryza glaberrima:An indicator plant for rice tungro spherical virus

Cabauatan¹,

Kobayashi²,

Ikeda³

et al. 1993

International Journal of Pest Management

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The accession of Oryza glaberrima (IRGC Acc. no. 100139) was identified and evaluated as an indicator plant for rice tungro spherical virus (RTSV), a latent virus of rice. This accession was susceptible and sensitive to RTSV infection. When 7-day-old seedlings were inoculated with viruliferous leafhopper Nephotettix virescens, the infected plants showed stunting, reduced tillering, and pale green leaves 3-4 weeks after inoculation. The visual evaluation of infected plants corresponded well with the serological assay. Accession 100139 could also be used to distinguish plants infected either with rice tungro bacilliform virus (RTBV) or both RTBV and RTSV, based on characteristic symptoms and the life span of infected plants. The indicator plant would be useful in studying the epidemiology of rice tungro viruses without the need for expensive serological assays.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oryza glaberrima:An indicator plant for rice tungro spherical virus

Cabauatan¹,

Kobayashi²,

Ikeda³

et al. 1993

International Journal of Pest Management

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“…Abaca fiber production, however, is hampered by viral diseases such as bunchy top disease, mosaic disease and bract mosaic disease [13,14]. Abiotic stresses such as typhoons, severe flooding and drought also serve as important constraints to optimal abaca fiber productivity.…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide SNP and Indel Discovery in Abaca (Musa textilis Née) and among Other Musa spp. for Abaca Genetic Resources Management

Barbosa

Asunto

Koh

et al. 2023

CIMB

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Abaca (Musa textilis Née) is an economically important fiber crop in the Philippines. Its economic potential, however, is hampered by biotic and abiotic stresses, which are exacerbated by insufficient genomic resources for varietal identification vital for crop improvement. To address these gaps, this study aimed to discover genome-wide polymorphisms among abaca cultivars and other Musa species and analyze their potential as genetic marker resources. This was achieved through whole-genome Illumina resequencing of abaca cultivars and variant calling using BCFtools, followed by genetic diversity and phylogenetic analyses. A total of 20,590,381 high-quality single-nucleotide polymorphisms (SNP) and DNA insertions/deletions (InDels) were mined across 16 abaca cultivars. Filtering based on linkage disequilibrium (LD) yielded 130,768 SNPs and 13,620 InDels, accounting for 0.396 ± 0.106 and 0.431 ± 0.111 of gene diversity across these cultivars. LD-pruned polymorphisms across abaca, M. troglodytarum, M. acuminata and M. balbisiana enabled genetic differentiation within abaca and across the four Musa spp. Phylogenetic analysis revealed the registered varieties Abuab and Inosa to accumulate a significant number of mutations, eliciting further studies linking mutations to their advantageous phenotypes. Overall, this study pioneered in producing marker resources in abaca based on genome-wide polymorphisms vital for varietal authentication and comparative genotyping with the more studied Musa spp.

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“…Farmers lose an estimated average of 0.37 of rice crop due to major pests and diseases every year. Among these pests, rice tungro disease (RTD) can cause total crop failure, especially in several countries in South and Southeast Asia (Bajet et al ., 1986; Hibino, 1996). This disease is caused by rice tungro spherical virus (RTSV), which acts as a helper virus for the transmission of rice tungro bacilliform virus.…”

Section: Introductionmentioning

confidence: 99%

Molecular screening of traditional rice varieties using tsv1-linked simple sequence repeat markers

Caguiat

2019

J. Agric. Sci.

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Genebanks offer vast amounts of traditional germplasm with potential sources of novel genes against biotic and abiotic stresses. In order to utilize the germplasm in rice breeding programmes, there should be a fast screening approach such as the use of molecular markers. Thus, the current study aimed to evaluate the use of tsv1 resistance-linked simple sequence repeat markers (SSR) for the preliminary screening of Philippine traditional rice germplasm against rice tungro spherical virus (RTSV). The tsv1 resistance-linked SSR markers consisted of two to four repeat motifs with 5–24 base repeats. Expected sizes ranged from 123 to 465 base pairs (bp) with polymorphism information content ranging from 0.23 to 0.73. Genetic analysis showed six major clusters at 50%: Clusters A, B and C had individual accessions, Cluster D had three accessions, Cluster E had 55 and Cluster F had 42 accessions. The study showed the germplasm with alleles linked to tsv1 but should be validated in the future with induced screening. In general, the material consisted of selected germplasm showing the presence of alleles linked to the tsv1 gene. These rice accessions could be a source of resistance to RTSV following further validation. Furthermore, molecular markers provide a useful tool to accelerate the screening of genetic resources for biotic and abiotic stress tolerance.

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Occurrence and Spread of Rice Tungro Spherical Virus in the Philippines

Cited by 19 publications

References 0 publications

Oryza glaberrima:An indicator plant for rice tungro spherical virus

Oryza glaberrima:An indicator plant for rice tungro spherical virus

Genome-Wide SNP and Indel Discovery in Abaca (Musa textilis Née) and among Other Musa spp. for Abaca Genetic Resources Management

Molecular screening of traditional rice varieties using tsv1-linked simple sequence repeat markers

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