By Kenneth M. Smith
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Extra info for A Textbook of Plant Virus Diseases
There are, sometimes, raised blisters with the intervening areas pale. T h e yellow flecks enlarge a n d produce a fairly bright mosaic mottle. This is usually followed by a severe necrosis, resulting in the death of the growing points a n d youngest leaves. Histopathology CHENOPODiACEAE. Chenopodium amaranticolor. T h e shape and localization of Arabis mosaic virus and the effect on the fine structure of the cells in C. amaranticolor have been examined on the electron microscope. I n the chlorotic areas, some cells are badly damaged while others are only slightly altered.
Severe apple mosaic. T h e severe strain causes pronounced symptoms of all four categories on Bramley's Seedling. T h e preponderance of large chlorotic areas which are bright yellow in early summer and gradually fade to white, naturally results in comparatively few small flecks. Vein-banding is well developed, particularly on the younger leaves on the extension growth. Symptoms of mosaic are generally less frequent and less severe on the later-formed leaves, but, whereas with other strains they are usually sparse or entirely absent on the younger leaves, this severe strain causes symptoms on leaves almost u p to the tips of the extension growth.
Their grana are formed by a reduced n u m b e r of discs, and the stromatic lamellae are sometimes fragmented. Voluminous cytoplasmic areas containing large numbers of virus particles occur. These particles, which appear hexagonal in shape with a diameter of about 25-5 ηΐμ,, aggregate in concentric layers forming hollow spherical bodies of about 1 τημ in diameter (Fig. 8 B ) (Gerola et al, 1965). SOLANACEAE. Petunia hybrida H o r t . A similar study to the above has been carried out on P. hybrida ; the virus infection causes a disarrangement of the chloroplast grana and intergrana lamellae which form variously orientated curves.
A Textbook of Plant Virus Diseases by Kenneth M. Smith