I need to make Plasmodiophora brassicae inoculum density quantification by qPCR how long and in which conditions should I store my soil samples?

I am goin to collect soil samples for P. brassicae inoculum density quantification, however I am not sure why some articles say that those samples should be kept at 10ºC or -20ºC for no longer...

12 December 2016 9,618 3 View