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Studies on the tobacco brown spot disease in taiwan iv. cytological studies of alternaria alternata






Plant Protection Bulletin (Taichung) 27(4): 343-352

Studies on the tobacco brown spot disease in taiwan iv. cytological studies of alternaria alternata

Nuclear distribution and behavior in Alternaria alternata were studied using the HCl-Giemsa staining technique. The mycelium and conidia were predominantly uninucleate or binucleate, while trinucleate ones mostly were also common. Apical cells of the haphae were multinucleate. In these cells, the nuclei were arranged in line and were mostly located at the front part of the cells. The nuclear distribution in wild type T2 and its most variants was usually similar, however, some variants appeared to be binucleate and multinucleate predominantly. During the formation of a hyphal branch, a conidiophore or a conidium, one of the mother cell nuclei (or its daughter nuclei) migrated into the new initial cells, this nucleus then continue to divide further to form all the nuclei in the formed structures. In a germinating conidium, only one nucleus of the conidial cell migrated into germ tube. The germ tube was usually uninucleate or binucleate, but that of T2-S variants was predominantly binucleate. There were no relationships were observed between the pathogenicity and the nuclear number of the mycelium and conidia of A. alternata.

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Accession: 006522526



Related references

Tobacco brown spot disease in Taiwan. IV. Cytological studies of Alternaria alternata (Fries) Keisler. Chih wu pao hu hsueh hui hui kan = Plant protection bulletin 27(4): 343-351, 1985

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