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Spore dormancy and the need for external stimulants form elements in the initial relations between P. brassicae and the environment(for example, see Honig 1931). Only a few spores on release from rotten roots germinate immediately (Ogawa and others2001); forms of external stimulus (Hata and others 2002; Ohi and others 2003) could be needed to initiate the process. The readiness for germination of spores released from host roots was examined by a consecutive string of researchers, for example, Humphrey (1892), Chupp (1917), Naumov (1925), Honig (1931), and Colhoun (1958). In general, they concluded that bacteria and other organisms disintegrate the diseased host tissues and ¡®¡®condition¡¯¡¯ spores for more effective germination. These secondary microbes are not essential for the germination process itself. Unknown mechanisms present within the resting spore initiate germination and control its speed. It appears that these mechanisms within individual spores operate quite separately from other spores because not all spores germinate in synchrony. |
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