An SEM study of developmental variation in oospore
wall ornamentation of three Nitella species (Charophyta) in Australia.
Determination of viability of Phytophthora capsici oospores
with tetrazolium bromide staining test versus a plasmolysis method.
According to macrofossil data, the number of Chara oospores
and Potamogeton seeds decreased significantly in comparison with the previous zone.
After fertilization of an oogonium, the resulting oospore
was retained on the female thallus and underwent a number of cell divisions to produce a multicellular 'fruit'.
Production and germination of oospores
of Phytophthora infestans.
Inoculum was provided by soilborne oospores
, the levels of which had been built up over the years by ploughing infected plants into the soil following each screen, and airborne sporangia from rows of infected 7042(S) and HB 3 genotypes planted every 9th row.
Some of the new strains resist fungicides and may mate with strains already here and produce the long-lived oospores
The isolate is heterothallic forming aplerotic oospores
, which measured 19.
At the same time Cristatella mucedo statoblasts appear in the sediment record and the abundance of Characeae oospores
capsici may survive in seed and host plant debris in the soil by means of oospores
Other features indicative of water environment are abundant Characeae oospores
, Ranunculus sect.
production in PDC is reported (Singh and Chauhan, 1988) but it was not further reported from other places.