Nuclear behavior during the formation of appressoria byAlternaria alternata |
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Authors: | Si-Liang Huang Keisuke Kohmoto Hiroshi Otani Motoichiro Kodama |
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Institution: | (1) The United Graduate School of Agricultural Sciences, Tottori University, 680 Tottori, Japan;(2) Faculty of Agriculture, Tottori University, 680 Tottori, Japan |
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Abstract: | Nuclear behavior in the developmental process of appressoria inAlternaria alternata was investigated. In pregerminated conidia, approximately 94% of the conidial cells were uninucleate. The migration of a
nucleus into an elongating germ tube from a germinating conidium was confirmed after 2h of incubation at 24±1°C in PDB. Peak
frequencies of binucleate and trinucleate germ tubes were detected 1 and 2h after the peak frequency of uninucleate germ tubes,
respectively. Four-and five-nucleate germ tubes did not show marked peak frrequencies. A marked peak frequency of the six-nucleate
germ tubes occurred about 1 h after the peak frequency of the trinucleate germ tubes, suggesting that the nuclei in the trinucleate
germ tubes each divided once within 1 h. The significance of early establishment of multinucleate appressorial cells in the
colonization of host plants by pathogenicA. alternata was discussed. |
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Keywords: | Alternaria alternata appressorium nucleus |
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