果园
发表于 2025-3-21 16:26:20
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2否定
发表于 2025-3-21 22:52:38
(PVX; Genus ,)es of infection. Other strains induce necrotic streaks, severe mosaic, crinkling and rugosity of leaves and may cause significant yield losses. In potato cultivars with genes Nx and Nb, some strains of PVX induce a hypersensitive severe top necrosis (Cockerham, 1955; Jones, 1985). In mixed infections with PVY, yields are reduced by up to 50%.
cauda-equina
发表于 2025-3-22 02:58:00
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轻弹
发表于 2025-3-22 05:39:43
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玩忽职守
发表于 2025-3-22 11:13:45
Viroidsature (Diener and Raymer, 1967). Several strains of PSTVd, with 356 to 360 nucleotides, have been reported (Puchta . 1990; Gross . 1978; Owens . 1992; Behjatnia . 1996). These strains can be grouped as mild, intermediate, and severe according to the symptoms they produce in potato and tomato.
态学
发表于 2025-3-22 13:48:12
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Rankle
发表于 2025-3-22 17:06:25
Biology and Physiology of the Potatoicated potato grow wild in this area, mainly in the Andes of Peru and Bolivia. Archeological remains and archives of the early Spanish occupation provide evidence that the potato was domesticated by the native population between 5,000 and 2,000 years prior to the Spanish discovery.
Rheumatologist
发表于 2025-3-22 21:34:16
Important Potato Cultivarstato was first introduced to Europe from South America, either from the northern Andes as . (short day adapted), or from southern Chile as . (long day adapted) and the earliest descriptions are of what appear to be mixed genotypes (Salaman, 1949). From about 1550 to 1750, the potato was selected and
Crayon
发表于 2025-3-23 04:56:38
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评论者
发表于 2025-3-23 05:50:48
(PLRV;Genus ,; Family ,)f young leaflets of some cultivars may develop reddening. Secondary symptoms, in plants grown from infected tubers, are stunting of the shoots and upward rolling of leaflets, especially of basal leaves (Fig. 5.3.1), which become rigid and leathery. In some culivars of . ssp. . and other wild species