Search results
Results from the WOW.Com Content Network
Rhizoctonia solani root rot on corn roots, magnified 0.63X. Damping off can be prevented or controlled in several different ways. Sowing seeds in a sterilized growing medium can be effective, although fungal spores may still be introduced to the medium, either on the seeds themselves or after sowing (in water or on the wind).
In sterilized soil and peat, however, spores readily germinate, and after 7 days, extensive mycelium and sporulation is visible. The phenomenon that germination and growth of fungal propagules is inhibited by active soil microorganisms is typical for most soils and is known as soil fungistasis.
The primary inocula are the ascospores, sexual spores which are produced in the perithecia. [4] Spores are forcibly discharged and can germinate within six hours upon landing on the plant surface. The scab disease is monocyclic; after one cycle of infection with ascospores, the fungus produces macroconidia by asexual reproduction. [5]
In direct germination, sporangia directly penetrate the host cells at the plant's root tips (if it's within reach). Indirect germination involves sporangia releasing zoospores (if the root is at a farther distance from the sporangia) which encyst on the host plant cells and germinate. Zoospores are biflagellate asexual motile spores. They are ...
Some of the purple spores had abnormal morphologies, however. Normal morphology includes a nucleus, a double wall, and an ooplast. After a 60-day maturation period, no germination of the dormant oospores was observed. After a 110-day incubation period, >0.5% of oospores germinated. Longer germination times only marginally increased germination ...
Germination can also refer to the emergence of cells from resting spores and the growth of sporeling hyphae or thalli from spores in fungi, algae and some plants. Conidia are asexual reproductive (reproduction without the fusing of gametes) spores of fungi which germinate under specific conditions. A variety of cells can be formed from the ...
The final stage is a fruiting body which pumps new spores out into the surrounding air. In other fields, the term has been applied to the decay of crop plants by fungi. In health and safety , the term is used to describe the deterioration of rubber , for example the cracking of rubber hoses.
Once these spores germinate, they produce a structure called a haustoria, capable of "sucking" nutrients from the plant cells directly under the epidermis of the leaf. At this point, the fungi can infect leaves, buds and twigs that then reinfect other plants or further infect the current host.