Change of Nec1 gene copy number detected in soil in potato seedling transplant cultivation field
2007
Yoshida, H. | Osada, D. | Suyama, K., Tokyo Univ. of Agriculture, Tokyo (Japan)
The control effect on potato scab of the transplant cultivation of potato seedling was examined. The scab severity of seed tuber plot was recognized at head of July and that scab severity became 57.9 at the end of July.However,after the head of August,the rapid increase of scab severity was not recognized. On the other hand, the scab severity of potato seedling plots was first recognized at the head of August. Afterwards, the scab severity became 30.6 by the middle of August and continued to increase until the head of October which potato were harvested. From these results, found out that scab severity is lower than the scab severity of seed tuber in the early stages of the tuber farming of potato seedlings. Moreover, the change of the number of the nec1 genes in soil in both potato seedling plot and the seed tuber plot was investigated. The nec1 gene is a gene that forms part of a pathogenicity island in common scab potato pathogen. The quantity of nec1 was decline tendency during August, that quantity increase in September again. On the other hand, the quantity of nec1 gene of potato seedling plot was low at the end of July. During the middle of August from the end of July when potato seedling plot initiate growth, the quantity of nec1 of that plot decreased. And on September, the quantity of nec1 of potato seedling increased again similar to seed tuber plot. These results suggested that the activity period of potato scab pathogen in potato seedling plot soil was different from the seed tuber plot.
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