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Developmental Morphology of Hop Stunt Viroid‐infected Hop Plants and Analysis of Their Cone Yield 1 )
Author(s) -
Momma T.,
Takahashi T.
Publication year - 1984
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1984.tb00734.x
Subject(s) - biology , hop (telecommunications) , virology , botany , computer network , computer science
Abstract Infection of hop plants with hop stunt viroid (HSV) results in the retardation of the growth rate except for the rate of leaf emergence and the disappearance of the fold‐like structure over the epidermal cell. Mature cones from HSV‐infected hop plants remained small‐sized and the content of α‐acid was half to one third of that of HSV–free hop cones. In HSV‐infected hop cones, the lupulin glands are distributed most abundantly on the bracteoles and the perianths and their numbers are reduced by at least 60% of that in the HSV‐free control. Scanning electron micrographs confirm that most of the lupulin glands on bracteoles from HSV‐infected hop cones shrivel severely, but not those from HSV‐free hop cones. They also reveal that the lupulin glands on the perianths from both, HSV‐free and HSV–infected hop cones become withered. Moreover, spherical granules (1.2 to 1.9μm in diameter) were not observed on the surface of the lupulin glands from HSV‐infected hop cones.