stem is the part of potato plant that is used as vegetable.
which part of potato plant is used as vegetable?
stem
as with all grafts, this plant will not occur in nature and cannot be grown from seed, because the two parts of the plant remain genetically separate, and only rely on each other for nourishment and growth. like most standard types of plant grafting, a small incision is made in the stem of both plants and they are strapped together. once the cuts have healed and the plants are joined, the leafy top of the potato plant can be cut away and the roots of the tomato can be removed, leaving the leaves of the tomato plant to nourish the roots of the potato plant. the rootstock (potato) acts as a stable and healthy root system and the scions (tomato) are chosen for their fruit, flowers or leaves. the tomatoes should be ready to harvest after about 12 weeks during the summer months, the potatoes should be ready after the tomato leaves begin to die back, normally in early autumn. grafting in this way can be used to produce many different related crops from the same plant, for example the growing popularity of 'fruit salad' trees, which is a single tree that produces multiple types of citrus fruits, or a tree with a variety of fruits with stones (peach, plum etc.).
pomato
it has been shown that the pvy has different isolates according to the symptoms they induce in various potato plant species. extensive biological, serological and molecular variability of pvy isolates makes the classification of isolates as particular strains particularly difficult. occurrence of a variety of symptoms and the emergence of the necrotic pvy has led to a search for more reliable classification tools than simple serological identification. traditionally three chief strains of pvy are recognized: pvy, pvy and pvy. pvy, originally known as "potato virus c", was the first to be recognized and was identified in the 1930s. pvy induces hypersensitive responses in a wide range of potato cultivars. these reactions include the formation of mild mosaic patterns or stipple streak. unlike the other strains of pvy, some pvy strains are non-aphid transmissible. previous studies by visser "et al." did not identify any of the local isolates as being pvy but it has been reported to occur to in south africa. a second strain of pvy is pvy. some notes on suspected variant of solanum virus 2 ("potato virus y"). this strain was described in tobacco plants growing close to potato plants. pvy results in leaf necrosis and mild or even no damage to the tubers. the ordinary strain of pvy is denoted as pvy. infection of a potato plant with the pvy strain results in mild tuber damage and does not cause leaf necrosis. both pvy and pvy are aphid transmissible and occur in south africa. in europe these two strains have been shown to have recombined to form pvy. the pvy has been accredited with the ability to induce potato tuber necrotic ringspot disease (ptnrd). tubers damaged by ptnrd become unmarketable and infection by pvy thus results in a larger economic impact than infection by the other strains.
potato virus y