Effects of grapevine leafroll-associated virus 3 infection on vine growth and fruit quality in 'Kyoho' grapevines

摘要

Grapevine leafroll-associated virus 3 is one of the severest viral diseases found in Korea. A total of 544 grapevines were selected from five regions to delect viral diseases. The grapevines were tested by EL.ISA with antiserum manufactured by Bioreba Co. and Sanofi Co. GLRaV-l, GLRaV-3, GLRaV-5, GFkV, ToRSV and GVA were detected, and these virus infection ranged were from 0.2 to 16.4 percent. Leaf redness and ieafroll symptoms were observed. 'Rubi' and some oilier species of red-fruit cultivars showed positive reactions to GLRaV-3 amiscrum by ELISA. On the other hand, yellowish leafroll symptoms were observed in white-fruit cultivars. Flexible filamentous virus particles of 1800 X 12 nm were observed in GLRaV-3 infected leaves. In delecting GLRaV-3. green and/or hard wood including phloem tissue was most effective. The growth of virus-free stock was more uniform and better than that of virus-infected grapevines. Soluble solids and anthocyunin contents in fruits on virus-free stocks were higher than those in the infected ones. The fruits from GLRaV-3 infected grapevines delayed increasing sugar content and showed poor coloration. Fruit coloration of virus-infected grapevines did not advance until harvest time and homes were dried and shriveled.