Germination of Chara vulgaris and Nitella flexilis oospores
: What are the relevant factors triggering germination?
First identification key for charophyte oospore
from central Europe.
Celakovsky (1874) had recognized three generations in the life cycle of Coleochaete: zoospore-producing thalli (A); gamete-producing thalli (B); and the multicellular body produced from the fertilized oospore
Chemical stimulation of oospore
formation in Phytophthora capsici.
The latter two species are heterothallic thus did not produce oospores
and or sexual structures in single cultures.
Thermal inactivation of Phytophthora capsisi oospores
In samples from layers V Chara oospores
are present in high numbers (over 1500 in sample [V.sub.6-8]).
Inoculum is provided by oospores
ploughed into the soil and airborne sporangia from preplanted rows of infected pearl millet genotypes.
- Pythium inoculum containing active mycelia and oospores
that could survive in and infest the soil of treatment plants was prepared by growing the five Pythium isolates in sterile grass blade cultures (Martin 1992).
Mating behavior of Phytophthora parasitica: Evidence for sexual recombination in oospores
using DNA restriction fragment length polymorphisms as genetic markers.
"Sexually produced spores, called oospores
, have a protective cell wall that allows them to live in the soil, infected stems, and tubers and still be viable the following season."