Is papaya ringspot virus harmful to humans?
PRSV-resistant transgenic papaya is environmentally safe and has no harmful effects on human health.
What is PMeV?
Papaya meleira virus (PMeV) is the causal agent of papaya sticky disease, which is characterized by a spontaneous exudation of fluid and aqueous latex from the papaya fruit and leaves.
How does PRSV affect papaya?
Papaya exhibits yellowing, leaf distortion, and severe mosaic. Oily or water-soaked spots and streaks appear on the trunk and petioles. The fruit will exhibit bumps and the classic “ringspot”. A severe isolate of PRSV has also been shown to cause tissue necrosis.
How do you treat papaya ringspot virus?
There is no cure for papaya ringspot disease and the disease is very difficult to control once it has become established. In home gardens within the biosecurity zones, infected plants should be removed as soon as symptoms are noticed.
What are the symptoms of papaya ringspot virus?
In papaya, leaves develop prominent mosaic and chlorosis on the leaf lamina, and water soaked oily streaks on the petioles and upper part of the trunk. Severe symptoms often include a distortion of young leaves which also result in the development of a shoestring appearance that resembles mite damage.
How did they make the genetically modified papaya immune to ringspot disease?
The concept of pathogen-derived resistance has been employed for the development of transgenic papaya, using a coat protein-mediated, RNA-silencing mechanism and replicase gene-mediated transformation for effective PRSV disease management.
How is papaya disease treated?
Control : As soon as the disease symptoms are observed dusting Sulphur (30 g/10 litres of water) or spraying Calixin 75 EC (5 ml/10 litres of water) at 15 days interval helps to control the disease. Leaf- Blight(Corynespora cassiicola) : The disease causes severe damage to leaves.
Why is papaya sticky?
The sticky appearance of infected papaya fruits after the latex oxidation by exposure to the air led to the name papaya sticky disease (“meleira” in Portuguese) (Fig. 1).
What virus got to the Hawaiian papaya?
Papaya ringspot virus raised havoc on papaya farms from the time it first appeared in 1992 in Puna, Hawaii’s major papaya-growing region, until 1998 when seed of Rainbow, a transgenic virus-resistant variety, were released to farmers.
What is ringspot in plants?
What is Ringspot? Tomato ringspot virus is caused by a plant virus that’s believed to be transferred from sick plants to healthy ones through pollen and vectored throughout the garden by dagger nematodes. These microscopic roundworms live in the soil, freely moving between plants, albeit slowly.
What does papaya ringspot virus do?
Papaya ringspot virus infects papaya and cucurbits systemically. Symptoms on papaya are somewhat similar to those on cucurbits. In papaya, leaves develop prominent mosaic and chlorosis on the leaf lamina, and water soaked oily streaks on the petioles and upper part of the trunk.
How does the papaya meleira virus ( pmev ) work?
Papaya meleira virus (PMeV) is the causal agent of papaya sticky disease, which is characterized by a spontaneous exudation of fluid and aqueous latex from the papaya fruit and leaves. The latex oxidizes after atmospheric exposure, resulting in a sticky feature on the fruit from which the name of the disease originates.
Which is causal agent of papaya sticky disease?
These authors contributed equally to this work. Papaya meleira virus (PMeV) is the causal agent of papaya sticky disease, which is characterized by a spontaneous exudation of fluid and aqueous latex from the papaya fruit and leaves.
Are there any viruses that affect papaya plants?
Nevertheless, the most important viruses that affect papaya are the Papaya ringspot virus (PRSV), the Papaya leaf distortion mosaic virus (PLDMV), the Papaya lethal yellowing virus (PLYV), the Papaya mosaic virus (PapMV) and the Papaya meleira virus (PMeV), which have been known to cause serious damage to the crop production throughout the world.
