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Differectial Induction of Zoospore Encystment and Germination in Aphanomyces astaci , Oomycetes
Author(s) -
SENSSON EBBE,
UNESTAM TORGNY
Publication year - 1975
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1975.tb03895.x
Subject(s) - zoospore , germination , potassium , crayfish , spore , biology , mannitol , lability , microbiology and biotechnology , ionic bonding , botany , chemistry , biochemistry , ecology , organic chemistry , ion
Genmination and encystment of zoosspores of Aphanomyces astaci , the very serious pathogen of European freshwater crayfish, Astacus astacus , were studied in ritro . Encystment of motile zoospores was achieved using mild heating, stirring, or addition of alkali metal chlorides or mannitol. The physical treatments were inhibitory to the subsequent germination, while encytment could be achieved with potassium chloride, indicating that the two processes are differently induced and can be studied separately. The effect of temperature on these processes was also somewhat different. Some ionic substances drastically influenced the final shape of the cyst. but without noticeably influencing the subsequent germination. Germination was induced by a short exposure to the stimulatory substances. A synergistic effect between ionic and non‐ionic compounds was found. The receptivity of the zosspores to the triggering substances was low in newly formed spores but increased during the first 3 h of motility. The initiation of germination is suggested to be parltly to be partly due to an osmotic effects on the zoospore. The relevance of the experimental results to in vivo conditions in discuessd.