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CHARACTERIZATION OF COMPLEX OF MOSAIC AND RINGSPOT VIRUS DISEASES OF PAPAYA (CARICA PAPAYA L.) IN MIDDLE GUJARAT
| Content Provider | KrishiKosh-Indian National Agricultural Research System |
|---|---|
| Advisor | VALAND, G. B. |
| Researcher | Parmar, Ramjibhai G. |
| Abstract | The complex nature of papaya mosaic and ringspot virus diseases with typical mosaic pattern symptoms on leaves and ringspot on fruits were commonly observed in farmers field. The incidence of mosaic and ringspot virus diseases of papaya ranged between 2.5 to 45.0 per cent and 10.0 to 92.0 per cent on cultivar honeydew of papaya recorded respectively from different locations of Anand district. On sap inoculation to papaya test plants, papaya mosaic produced mottling, puckering, blistering with reduced size of leaves coupled with shoestring, downward and upward rolling, whereas papaya ringspot virus produced mild mosaic, severe mottling on leaves without conspicuous leaf deformation and pale yellow and green line pattern on leaves. The field symptoms of papaya mosaic virus was mottling, reduction in size of leaves, bulging of leaf lamina between the secondary veins and veinlets on the upper surface of young terminal leaves are the characteristic symptoms coupled with downward and upward rolling of leaves and deformed fruit consists of dark green oily spots. Whereas papaya ringspot virus infected plant showed mild to marked mosaic mottling on leaves without conspicuous leaf deformation, various types of line patterns along the veins and veinlets coupled with irregular mosaic pattern. Fruit symptom consists of prominent yellow ringspots at maturity. The papaya mosaic virus infects papaya (Carica papaya L.), watermelon (Citrullus vulgaris Thunb), cucumber (Cucumis sativus L.), muskmelon (Cucumis melo Bush), bottlegourd (Lagenaria siceraria Mill), ridgegourd (Luffa acutangula L.), chill (Chenopodium amaranticolor L.), globe amaranth (Gompherena globosa L.), whereas papaya ringspot virus infects papaya (Carica papaya L.), watermelon (Citrullus vulgaris Thunb), cucumber (Cucumis sativus h), muskmelon (Cucumis melo Bush), littlegourd (Coccinia indica W & A), Pumpkin (Cucurbita moschata Dusch), bottlegourd (Lagenaria siceraria Rusby), smoothgourd {Luffa aegyptica Mill), chilli (Capsicum annum L.), spinach (Spinacea oleraceae L.), chill (Chenopodium amaranticolor, Chenopodium quinoa L.). On sap inoculation of papaya mosaic virus, Washington, CO.l, Sunrise Solo, Honeydew were found highly susceptible; Pusa Nanha, C0.4, Pusa Dwarf, Coorg Honeydew, Agidoot-3 moderately susceptible, whereas Pusa Delicious (Pusa-15) and Pusa Giant were found moderately resistant; CO.2 and Pusa Majesty noticed resistant against papaya mosaic virus during varietal screening. None of the cultivars was found immune to papaya mosaic virus. Further, the ringspot virus of papaya when sap inoculated on different test plants of papaya cultivars, Washington, CO.1, C0.4, Sunrise Solo, Agidoot-3, Honey dew and Coorg Honey dew were found highly susceptible, while Pusa Majesty, Pusa Dwarf, Pusa Giant moderately susceptible; Pusa Nanha and CO.2 moderately resistant and Pusa Delicious was noticed resistant against papaya ringspot virus. None of the cultivars was found immune to papaya ringspot virus disease. The papaya mosaic and ringspot viruses are readily transmitted through mechanical inoculation and by aphid (Myzus persicae Sulzer) within two minutes of acquisition and inoculation feeding periods, respectively. The papaya mosaic virus was inactivated at 70 to 75°C temperature, had a dilution end point of 10-3. It remained infective in crude sap upto 30 hours at room temperature; whereas papaya ringspot virus inactivated at 55 to 60°C temperature, dilution end point of 10-2 and longevity in vitro is 18 hours at 25-30°C temperature. In a serological test, papaya mosaic virus gave mild (++) reaction with potato virus X (PVX) indicated and confirmed that papaya mosaic virus is a group of potexvirus. Whereas papaya ringspot virus showed mild (++) reaction with potato virus Y (PVY) and strong (+++) reaction with the antisera of potyviridae, indicating that papaya ringspot virus is a group of potyvirus group. The accumulation of serine, glutamic acid, proline, tryptophan and isoleucine was found at higher concentration into the papaya ringspot virus infected leaf as compared to papaya mosaic virus infected leaf. There were very low concentrations of proline and tryptophan in healthy leaves of papaya plants. |
| File Size | 6525498 |
| File Format | |
| Language | English |
| Publisher | AAU |
| Publisher Place | Anand |
| Access Restriction | Open |
| Subject Keyword | Characterization of Complex of Mosaic Ringspot Virus Diseases Papaya (carica Papaya L.) Middle Gujarat Characterization of Complex of Mosaic and Ringspot Virus Diseases of Papaya (carica Papaya L.) In Middle Gujarat Plant Pathology Agriculture A Study |
| Content Type | Text |
| Educational Degree | Master of Science (M.Sc.) |
| Resource Type | Thesis |
