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VEIN CLEARING AND VEIN BANDING INDUCED BY HYOSCYAMUS III DISEASE
Author(s) -
SHEFFIELD F. M. L.
Publication year - 1938
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1938.tb02353.x
Subject(s) - biology , anatomy , xylem , vein , clearance , botany , fern , medicine , urology
SUMMARY The first symptom of Hy. III disease in tobacco is a clearing of the veins. This is followed later by vein banding. During clearing no anatomical or cytological abnormalities occur. The yellow colour is due to a retardation of chlorophyll formation. When vein banding becomes apparent considerable hypertrophy is seen in the tissues near the veins and hypoplasia is apparent in the inter‐veinal areas. Intracellular inclusions are abundant in all tissues except the xylem. Cleared tissue contains 6–11 times as much virus per unit volume as does the banded tissue. The latter also contains less than do the yellower parts of banded leaves. I am indebted to Fraulein Lina Cunow who made most of the permanent preparations used in this study.