Chrysanthemum phloem necrosis: onset of systemic ultrastructural changes

Vascular tissues in root and shoot apices, lateral buds, leaves, and petioles of florists' chrysanthemum Dendranthema grandiflora cv Pink Marble affected by chrysanthemum phloem necrosis were studied by light and electron microscopy for early evidence of disease. Specimens were taken from field...

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Bibliographic Details
Published in:International journal of plant sciences 1992-06, Vol.153 (2), p.197-204
Main Authors: Israel, H.W. (Cornell University, Ithaca, NY), McGovern, R.J, Horst, R.K
Format: Article
Language:English
Subjects:
AETIOLOGY
Botany
CELL STRUCTURE
CELL ULTRASTRUCTURE
COMPOSITAE
cytopathology
DENDRANTHEMA
dendranthema grandiflora
Disease
ESTRUCTURA CELULAR
ETIOLOGIA
ETIOLOGIE
ETIOLOGY
FITOPATOLOGIA
FLOEMA
Fluorescence
Host-Pathogen Interactions
intracellular bodies
MLO
MYCOPLASMALIKE ORGANISMS
NECROSE
NECROSES
NECROSIS
ORGANISMOS MICOPLASMICOS
PARENCHYMA
PARENCHYME
PARENQUIMA
PATHOLOGIE VEGETALE
Pathology
PHLOEM
PHLOEME
Plant cells
Plant diseases
PLANT PATHOLOGY
Plant tissues
Plants
protophloem
Sieve elements
SIEVE PLATES
STRUCTURE CELLULAIRE
Vascular tissues
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Summary:Vascular tissues in root and shoot apices, lateral buds, leaves, and petioles of florists' chrysanthemum Dendranthema grandiflora cv Pink Marble affected by chrysanthemum phloem necrosis were studied by light and electron microscopy for early evidence of disease. Specimens were taken from field-, glasshouse-, and growth-chamber-grown plants. Additionally, vascular tissues of initially uninfected cv Fanfare scions were examined after they were inoculated by grafting to infected Pink Marble stocks. Ubiquitous cytopathological features of affected tissues included (i) strongly autofluorescent clusters of obliterated young phloem; (ii) severely hypertrophied, resembling nacre, and/or collapsed mature sieve-tube elements and protophloem cells; (iii) prominent cell-wall ingrowths, similar to those of transfer cells, in phloem parenchyma and companion cells; (iv) distinct apposition formation along phloem parenchyma walls; (v) end-wall disruption of immature sieve-tube elements; and (vi) abnormally dense and darkly stained cell protoplasts. Intracellular bodies, some of which resembled mycoplasma-like organisms, were seen consistently in infected plants but infrequently in anatomically affected cells.
ISSN:1058-5893
1537-5315
DOI:10.1086/297022