Open AccessAutecology of Fusarium oxysporum f. sp. raphani in soils suppressive and conducive to Fusarium‐wilt of radish
Author(s) -
Toyota K.,
Kamesaka T.,
Kimura M.
Publication year - 1995
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/j.1574-6941.1995.tb00290.x
Subject(s) - biology , fusarium oxysporum , soil water , germination , agronomy , population , conidium , fusarium wilt , spore , horticulture , botany , ecology , demography , sociology
Effects of organic amendments and alterations of environmental conditions on the inoculum potential of Fusarium oxysporum f. sp. raphani PEG‐4 (PEG‐4), estimated from its population dynamics and spore germinability, were investigated using soils suppressive (S‐soil) and conducive (C‐soil) to Fusarium‐wilt of radish. The results on the population dynamics of PEG‐4 in S‐ and C‐soils showed that the germination‐lysis mechanism, proposed by Chinn and Ledingham (Can. J. Bot. (1962) 39, 739–748), seemed to be applicable to S‐soil, while not application to C‐soil. Germination of PEG‐4 microconidia in soils supplemented with glucose and asparagine (1 mg g −1 of soil) was higher in C‐soil than in S‐soil, showing that S‐soil possessed a greater degree of fungistasis than C‐soil. Organic amendments, especially rice straw and fresh radish residue (FRR), brought about suppressive effects on the germination of PEG‐4 in both soils along with their decomposition. These results suggest that the autecology of PEG‐4 in S‐ and C‐soils was quite different depending on incubation conditions, and presence or absence of organic amendments.