Vector Bionomics of Two Species of Chaetocnema (Coleoptera: Chrysomelidae) in Rice Yellow Mottle Virus Transmission in Lowland Rice in Tanzania

2002 ◽  
Vol 20 (4) ◽  
pp. 95-104 ◽  
Author(s):  
O. O. Banwo ◽  
R. H. Makundi ◽  
R. S. Abdallah ◽  
J. C. Mbapila ◽  
F. M. Kimmins
Keyword(s):  
Virus Transmission ◽  
Lowland Rice ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Yellow Mottle

Bionomics and importance of two species ofChaetocnema in rice yellow mottle virus transmission in lowland rice in Tanzania

2002 ◽  
Vol 30 (1) ◽  
pp. 96-104 ◽  
Author(s):  
O. O. Banwo ◽  
R. H. Makundi ◽  
R. S. Abdallah ◽  
J. C. Mbapila ◽  
F. M. Kimmins
Keyword(s):  
Virus Transmission ◽  
Lowland Rice ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Yellow Mottle

scholarly journals Insect Vectors of Rice Yellow Mottle Virus

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Augustin Koudamiloro ◽  
Francis Eegbara Nwilene ◽  
Abou Togola ◽  
Martin Akogbeto
Keyword(s):  
Host Range ◽  
Resistance Genes ◽  
Virus Transmission ◽  
Rice Production ◽  
Insect Species ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Insect Vectors ◽  
African Countries ◽  
Yellow Mottle

Rice yellow mottle virus (RYMV) is the major viral constraint to rice production in Africa. RYMV was first identified in 1966 in Kenya and then later in most African countries where rice is grown. Several studies have been conducted so far on its evolution, pathogenicity, resistance genes, and especially its dissemination by insects. Many of these studies showed that, among RYMV vectors, insects especially leaf-feeders found in rice fields are the major source of virus transmission. Many studies have shown that the virus is vectored by several insect species in a process of a first ingestion of leaf material and subsequent transmission in following feedings. About forty insect species were identified as vectors of RYMV since 1970 up to now. They were essentially the beetles, grasshoppers, and the leafhoppers. For this review, we presented the chronology of their identification. Also, the biology, ecology, host range, distribution, and caused damage of these insects were briefly summarized.

scholarly journals Occurrence of rice yellow mottle virus resistance breaking isolates in lowland catchment zones of Uganda

1970 ◽  
Vol 29 (3) ◽  
pp. 383-400
Author(s):  
I. Ramathani ◽  
S.B. Mukasa ◽  
T. Alicai ◽  
S. Nanyiti ◽  
J. Lamo
Keyword(s):  
Virus Disease ◽  
Lowland Rice ◽  
Mottle Virus ◽  
Post Inoculation ◽  
Rice Yellow Mottle Virus ◽  
Symptom Development ◽  
Rt Pcr ◽  
Resistance Breaking ◽  
Catchment Areas ◽  
Yellow Mottle

Rice (Oryza spp; 2n=24.) production in Uganda and Africa in general, is seriously threatened by the Rice yellow mottle virus disease (RYMVD), a disease caused by Rice yellow mottle virus (RYMV) within the genus Sobemovirus; family Sobemoviridae. This study investigated the existence and distribution of resistance-breaking RYMV pathotype in the three major lowland rice catchment areas in Uganda. Four known rice accessions resistant to Rice yellow mottle virus (RYMV) namely; Gigante, Tog5672, Tog5674 and Tog5681, carrying resistant allele’s rymv1-2, rymv1-4 & RYMV3, rymv1-5 and rymv1-3, respectively, were tested for their response to different RYMV isolates. The isolates were collected from three major lowland rice catchment areas of Doho, Kibimba, and Olweny in Uganda. Out of 100 leaf samples collected from the field and assayed for RYMV and confirmed to be positive using RT-PCR, 83 isolates induced symptoms on IR64- the RYMV susceptible line. Seventy-seven (92.8%) isolates were able to overcome resistance in at least one of the four differential rice accessions, as confirmed by the presence of RYMV symptoms; while 6 (7.2%) isolates were asymptomatic. Variation in time (days) for symptom development post-inoculation (dpi) and AUDPC were observed. Symptoms appeared within 5-7 days on IR64; while it took on average 11, 18, 36, and 18 days to appear on Gigante, Tog5672, Tog5674 and Tog5681, respectively. The highest AUDPC was observed on IR64 (254.7); while the lowest was observed on Tog5681 (74.1). Two major patho-groups were observed; those that broke down resistance in Gigante only (25.3%) and Gigante & Tog5672 (33.7%). Five isolates from Doho (Budaka & Bugiri districts) and Kibimba (Butaleja district) catchment areas broke down RYMV resistance in three accessions i.e. (Tog5681, Gigante & Tog5672) and (Tog5674, Gigante & Tog5672), respectively. Resistance breaking isolates were confirmed in all  the three sampled catchment zones, however, Doho and Kibimba had some unique isolates that broke down resistance in accessions carrying resistance allele rymv 1-3 and rymv1-5 in addition to rymv1-2. Results from this study showed that RYMV isolates in Uganda can break down resistance conferred by the rymv1-2 resistance gene allele. However, accessions Tog5681 and Tog5674 seem to hold stable RYMV resistance and, thus are recommended for RYMV breeding.

scholarly journals The rice yellow mottle virus P1 protein exhibits dual functions to suppress and activate gene silencing

2010 ◽  
Vol 61 (3) ◽  
pp. 371-382 ◽  
Author(s):  
Séverine Lacombe ◽  
Martine Bangratz ◽  
Florence Vignols ◽  
Christophe Brugidou
Keyword(s):  
Gene Silencing ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Yellow Mottle ◽  
Activate Gene ◽  
Dual Functions

Molecular epidemiology of the RNA satellite of Rice yellow mottle virus in Africa

2003 ◽  
Vol 148 (9) ◽  
pp. 1721-1733 ◽  
Author(s):  
A. Pinel ◽  
Z. Abubakar ◽  
O. Traor� ◽  
G. Konat� ◽  
D. Fargette
Keyword(s):  
Molecular Epidemiology ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Yellow Mottle

scholarly journals Synthesis of an infectious full-length cDNA clone of rice yellow mottle virus andmutagenesis of the coat protein

Virology ◽  
1995 ◽  
Vol 206 (1) ◽  
pp. 108-115 ◽  
Author(s):  
C. Brugidou ◽  
C. Holt ◽  
M. Ngon A Yassi ◽  
S. Zhang ◽  
R. Beachy ◽  
...  
Keyword(s):  
Coat Protein ◽  
Cdna Clone ◽  
Full Length ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Full Length Cdna ◽  
Yellow Mottle

scholarly journals The Genetic Basis of High Resistance to Rice Yellow Mottle Virus (RYMV) in Cultivars of Two Cultivated Rice Species

Plant Disease ◽  
1999 ◽  
Vol 83 (10) ◽  
pp. 931-935 ◽  
Author(s):  
M. N. Ndjiondjop ◽  
L. Albar ◽  
D. Fargette ◽  
C. Fauquet ◽  
A. Ghesquière
Keyword(s):  
Genetic Basis ◽  
Virus Isolate ◽  
Mottle Virus ◽  
F1 Hybrids ◽  
Enzyme Linked Immunosorbent Assay ◽  
Rice Yellow Mottle Virus ◽  
Recessive Resistance ◽  
Cultivated Rice ◽  
Recessive Resistance Gene ◽  
Yellow Mottle

Three cultivars of Oryza sativa (IR64, Azucena, and Gigante) and four cultivars of O. glaberrima (Tog5681, Tog5673, CG14, and SG329) were evaluated for their resistance to two isolates of rice yellow mottle virus (RYMV) by enzyme-linked immunosorbent assay (ELISA) and symptomatology. Cultivars Tog5681 and Gigante were highly resistant, and no symptoms were observed when either virus isolate was inoculated at 10 or 20 days postgermination and assayed by ELISA at 7, 14, 22, 35, 50, or 64 days postinoculation. Azucena showed a partial resistance, whereas the other cultivars were susceptible. Symptom appearance was associated with increase in ELISA absorbance in the systemically infected leaves. The best discrimination among the cultivars occurred when the plants were inoculated at 10 days postgermination. Crosses were made between the highly resistant (Gigante and Tog5681) and the susceptible (IR64) cultivars to determine the genetic basis of resistance to RYMV. Evaluation of F1 hybrids and interspecific progenies, as well as the segregation of resistance in F2 and F3 lines of the IR64 × Gigante cross, provided results consistent with the presence of a single recessive resistance gene common to Tog5681 and Gigante.

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