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Mycoplasma-like organisms in Gladiolus sp. plants with malformed and virescent flowers

Assunta Bertaccini and Francesca Marani
Phytopathologia Mediterranea
Vol. 19, No. 2/3 (Dicembre 1980), pp. 121-128
Stable URL: http://www.jstor.org/stable/42684495
Page Count: 8
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Abstract

Following electron microscopy observations performed on thin sections from different floral portions of Gladiolus with twisted floral spikes and virescent flowers, mycoplasma-like organisms (MLO) were found. In control material, MLO were not observed. No virus-like particles were found in the tested samples. The MLO were observed either in sieve tubes or in the cytoplasm of phloem parenchyma cells. Next to normal forms, MLO with morphological modifications, such as the presence of granules and accumulations of irregular contents in the cytoplasmic matrix, were observed. Such ultrastructural alterations are interpreted as being a result of a degeneration process. A seguito di osservazioni al microscopio elettronico effettuate su sezioni sottili di diverse porzioni fiorali di Gladiolo con sintomi di spiralizzazione dello scapo fiorale e di virescenza dei singoli fiori, sono stati rinvenuti dei corpi riferibili a micoplasmi (MLO). Nel materiale di controllo che non presentava sintomi essi non sono stati riscontrati. Nessun virus è stato inoltre evidenziato nei campioni in esame. I MLO sono stati osservati nei tubi cribosi e nel citoplasma delle cellule parenchimatiche del floema. Accanto a forme normali sono stati osservati MLO con márcate modificazioni morfologiche quali presenza di granuli e di ammassi di forma irregolare all'interno delle matrici citoplasmatiche. Tali alterazioni ultrastrutturali vengono interpretate, in base ai dati bibliografici, come risultato di un processo degenerativo.

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