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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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