The mosaic disease of cucurbits

9781130223422: The mosaic disease of cucurbits
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...which are growing rapidly. These facts indicate that the age and vigor of the plant have a direct relation to its susceptibility to mosaic. While this is probably true, it is a question what relation these factors bear to the susceptibility of the plant and its response to the disease stimulus. The rapidly dividing cells of the tissues still in the process of development apparently react to the disease stimulus more readily than the older tissues. It is possible that these younger tissues offer conditions more favorable to the multiplication of the virus 1 and consequent infection than the older cells of mature plants. It has been suggested that older plants may contain the virus but show the symptoms in so mild a form that they can not be detected. However, this has apparently been disproved by making inoculations from old plants which had been previously inoculated with The term virus is used here in the commonly accepted sense of the infective agent of a disease with which no visible organism has been associated. mosaic but showed no symptoms of the disease. No such plant has ever shown evidence of containing the virus, as all inoculations from them gave negative results, and it is probable that a definite difference in susceptibility occurs, depending on the age of the plant. LOCATION OF THE VIRUS IN THE PLANT. The virus of curcubit mosaic is distributed throughout practically all parts of the plant, with the possible exception of the roots. The data given in Tables VIII to X show that the juices of stem, leaves, and fruits of mosaic cucumber plants are all capable of producing infection. All the living leaves of a mosaic plant contain the virus, regardless of age or the presence of actual mosaic symptoms, its thorough distribution in the leaf cells bei...

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