Rice Tungro Disease

2020 ◽  
Author(s):  
Gaurav Kumar ◽  
Fauzia Zarreen ◽  
Indranil Dasgupta
Keyword(s):  
Rice Tungro Disease

Genome editing of indica rice ASD16 for imparting resistance against rice tungro disease

2022 ◽  
Author(s):  
Yaiphabi Kumam ◽  
G. Rajadurai ◽  
K. K. Kumar ◽  
S. Varanavasiappan ◽  
Malireddy K. Reddy ◽  
...  
Keyword(s):  
Genome Editing ◽  
Indica Rice ◽  
Rice Tungro Disease

scholarly journals The optimal control of rice tungro disease with insecticide and biological agent

2020 ◽  
Author(s):  
W. Suryaningrat ◽  
N. Anggriani ◽  
A. K. Supriatna ◽  
N. Istifadah
Keyword(s):  
Optimal Control ◽  
Biological Agent ◽  
Rice Tungro Disease

Transfer of transgenes for resistance to rice tungro disease into high-yielding rice cultivars through gene-based marker-assisted selection

2012 ◽  
Vol 150 (5) ◽  
pp. 610-618 ◽  
Author(s):  
S. ROY ◽  
A. BANERJEE ◽  
J. TARAFDAR ◽  
B. K. SENAPATI ◽  
I. DASGUPTA
Keyword(s):  
Marker Assisted Selection ◽  
Rice Tungro Bacilliform Virus ◽  
35S Promoter ◽  
Rice Cultivars ◽  
Rice Tungro Spherical Virus ◽  
Challenge Inoculation ◽  
Rice Line ◽  
Rice Tungro Disease ◽  
Sense Orientation ◽  
Simultaneous Infection

SUMMARYRice tungro disease (RTD), caused by the simultaneous infection of rice tungro bacilliform virus (RTBV) and rice tungro spherical virus (RTSV), is one of the major threats to sustainable rice production in South and Southeast Asia. Transgenic resistance against RTBV has been reported previously using an RNA interference (RNAi) construct (ORF IV of RTBV, placed both in sense and anti-sense orientation under CaMV 35S promoter), in the scented rice line Pusa Basmati-1 (PB-1). This construct was transferred to two high-yielding tungro-susceptible indica rice cultivars (IET4094 and IET4786) from the transgenic PB-1 rice line using back cross breeding till the BC2F3 stage. On challenge inoculation, the progenies (BC2F1) showed mild symptoms of tungro, in contrast to severe symptoms displayed by the recurrent parents. Segregation of the transgene indicated near homozygosity of the plants at the BC2F3 stage, implying that the lines can be used as a valuable resistance source for further breeding against RTD.

Synchrony of planting and proportions of susceptible varieties affect rice tungro disease epidemics in the Philippines

2001 ◽  
Vol 20 (6) ◽  
pp. 499-510 ◽  
Author(s):  
R.C Cabunagan ◽  
N Castilla ◽  
E.L Coloquio ◽  
E.R Tiongco ◽  
X.H Truong ◽  
...  
Keyword(s):  
The Philippines ◽  
Rice Tungro Disease ◽  
Disease Epidemics

Effect of botanicals on the population dynamics ofNephotettix virescens, rice tungro disease incidence and yield of rice

2000 ◽  
Vol 28 (2) ◽  
pp. 109-113 ◽  
Author(s):  
K. Rajappan ◽  
C. Ushamalini ◽  
N. Subramanian ◽  
V. Narasimhan ◽  
A. Abdul Kareem
Keyword(s):  
Population Dynamics ◽  
Disease Incidence ◽  
Rice Tungro Disease

scholarly journals VARIASI VIRULENSI VIRUS TUNGRO BERSUMBER DARI INOKULUM DI DAERAH ENDEMIS TUNGRO DI INDONESIA

2015 ◽  
Vol 15 (1) ◽  
pp. 1
Author(s):  
Nyoman Widiarta ◽  
Syahrir Pakki
Keyword(s):  
Free Choice ◽  
Resistant Variety ◽  
Group Variety ◽  
Inoculum Sources ◽  
Green Leafhopper ◽  
Resistant Varieties ◽  
Rice Tungro Disease ◽  
Box Method ◽  
Endemic Areas ◽  
Test Result

Variations in virulence of tungro viruses from various inoculum sources in tungro endemic areas in Indonesia. Rice tungro disease is caused by virus which is effectively transferred by the green leafhopper. Reactions of resistant varieties to virus sources of inocula from 15 tungro endemic areas were employed as indicator of variations of virus virulence. The green leafhopper of Sukamandi’s population was used as the vector and allowed to transfer viruses  acquired from tungro’s infected plants from 15 tungro endemic areas to five groups of virus resistant varieties based on parent source of resistance using free choice screening box method. The results showed that the most resistant variety was group V1-Tukad Petanu, followed by V4-Tukad Unda, V2-Tukad Balian and V3-Bondoyudo. Based on resistance test result group variety of V1-Tukad Petanu is recommended for 15 provinces source of incula except for Sulawesi Utara. Group variety of V4-Tukad Unda is not recommended to plant in Yogyakarta and Banten provinces. Group V2-Tukad Balian is not recommended to plant in Bali, Sulawesi Utara, Banten and Kalimantan Selatan provinces. Group V3-Bondoyudo is not recommended to plant in Jawa Tengah, Yogyakarta, and Banten provinces. There were variations in virus virulence among sources of inocula. Six virulence variants were identified, i.e. 001 (Jawa Barat, Nusa Tenggara Barat, Sulawesi Selatan, Jawa Timur, Lampung, Sulawesi Barat, Sulawesi Tengah, Sulawesi Tenggara, Papua), 011 (Jawa Tengah), 021 (Bali, Kalimantan Selatan), 051 (Yogyakarta), 071 (Banten) and 121 (Sulawesi Utara).

scholarly journals Assessing the Representativeness of Data on Yield Losses Due to Rice Diseases in Tropical Asia

Plant Disease ◽  
1998 ◽  
Vol 82 (6) ◽  
pp. 705-709 ◽  
Author(s):  
Serge Savary ◽  
F. A. Elazegui ◽  
Paul S. Teng
Keyword(s):  
Yield Loss ◽  
Production Systems ◽  
Rice Production ◽  
Yield Losses ◽  
Tropical Asia ◽  
Bacterial Diseases ◽  
Potted Plants ◽  
Rice Tungro Disease ◽  
Rice Ecosystems ◽  
One Year

The representativeness of information on yield losses due to rice diseases in tropical Asia was studied. Published studies involving different groups of diseases (viral, bacterial, and fungal) and conducted in different rice production ecosystems were compared to help identify research gaps, the filling of which could improve current disease management in rice and help in developing strategies that fit the management needs of fast-evolving rice production systems in the future. Four criteria of representativeness of yield loss information were used: representativeness over time (the proportion of studies conducted over more than one crop cycle), representativeness over space (the proportion of studies conducted in more than one location), representativeness of scale (the proportion of studies conducted on the scale of plots or fields), and representativeness of injury (the standard deviation of the proportion of studies using inoculation, spontaneous infection, or chemical control). A strong imbalance in both the number and the representativeness of studies dealing with fungal, viral, and bacterial diseases was found. Most of the few studies of yield loss due to viral diseases (mainly rice tungro disease) were conducted on the scale of individual (potted) plants or were based on one-year data sets, often reflecting strong epidemics only. Studies of bacterial diseases were conducted in single locations only, and whether such results can be extrapolated still needs to be addressed. There is an acute need to better document yield losses in rice ecosystems other than the irrigated ecosystem. While studies conducted in the upland, rain-fed lowland, and deep-water rice ecosystems seem to have a high degree of representativeness, this cannot compensate for their small number in view of the great diversity of these environments. Studies of irrigated rice tend to concentrate on one year and one location. This approach may be based on the erroneous view that the irrigated ecosystem is homogeneous, and possible extrapolation of data from these studies needs to be examined.

scholarly journals Near Immunity to Rice Tungro Spherical Virus Achieved in Rice by a Replicase-Mediated Resistance Strategy

1999 ◽  
Vol 89 (11) ◽  
pp. 1022-1027 ◽  
Author(s):  
H. Huet ◽  
S. Mahendra ◽  
J. Wang ◽  
E. Sivamani ◽  
C. A. Ong ◽  
...  
Keyword(s):  
Antisense Rna ◽  
Rice Tungro Bacilliform Virus ◽  
Japonica Rice ◽  
Rice Tungro Spherical Virus ◽  
Rice Plants ◽  
Antisense Orientation ◽  
Rice Tungro Disease ◽  
Sense Orientation ◽  
Moderate Resistance ◽  
High Level

Rice tungro disease is caused by rice tungro bacilliform virus (RTBV), which is responsible for the symptoms, and rice tungro spherical virus (RTSV), which assists transmission of both viruses by leafhoppers. Transgenic japonica rice plants (Oryza sativa) were produced containing the RTSV replicase (Rep) gene in the sense or antisense orientation. Over 70% of the plants contained one to five copies of the Rep gene, with integration occurring at a single locus in most cases. Plants producing antisense sequences exhibited significant but moderate resistance to RTSV (60%); accumulation of antisense RNA was substantial, indicating that the protection was not of the homology-dependent type. Plants expressing the full-length Rep gene, as well as a truncated Rep gene, in the (+)-sense orientation were 100% resistant to RTSV even when challenged with a high level of inoculum. Accumulation of viral RNA was low, leading us to conclude that RTSV Rep-mediated resistance is not protein-mediated but is of the cosuppression type. Resistance was effective against geographically distinct RTSV isolates. In addition, RTSV-resistant transgenic rice plants were unable to assist transmission of RTBV. Such transgenic plants could be used in an epidemiological approach to combat the spread of the tungro disease.

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