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Histopathologie der Infektion von Minneola‐Tangeio durch Alternaria alternata pv. citri sowie Einfluß von Wirt and Umweltfaktoren auf die Ausbildung von Läsionen
Author(s) -
Solel Z.,
Kimchi M.
Publication year - 1998
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.1439-0434.1998.tb04754.x
Subject(s) - biology , alternaria alternata , appressorium , conidium , inoculation , hypha , germ tube , botany , spore , fungi imperfecti , alternaria , histopathology , lesion , mycosis , horticulture , spots , microbiology and biotechnology , pathology , medicine , immunology
After inoculation of Minneola leaves with conidia of Alternaria alternata pv. citri , germ lubes randomly grew over the leaf surfaces. Twenty‐four h after inoculation, appressoria appeared over the epidermal cells; they formed infection hyphae that penetrated into the leaf, and developed intercellular branching hyphae which resulted in minute necrotic lesions. During the following 2–3 days, the lesions grew into large necrotic spots, subsequently accompanied by a dark discoloration of the veins extending from the lesions. Susceptibility of the leaves was negatively correlated with their age: mature leaves (approximately 2 months old) were very resistant to infection. Lesions developed faster when leaves were inoculated on the abaxial rather than the adaxial surface. There was no difference in disease severity on detached or intact leaves, or between leaves incubated in darkness or under natural light. Fruit were highly susceptible throughout the whole season.