FUNGI-notes - Ascomycetes: Basidiomycetes: Germination from...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chytrid with rhizoids. e rhizoids extend into a substrate and serve as their anchor. ete producing structures, are in the process of fusing to produce a zygospore. zygospore develops within a thick-walled zygosporangium. Basidiomycetes: Germination from spore Monocaryotic Haploid Meet mating partner – cell fusion Dicaryotic (heterokaryotic) Haploid Nuclear fusion Meiosis + Sporulation (Basidiospores) Ascomycetes: Germination from spore Monocaryotic Haploid Meet mating partner – cell fusion Dicaryotic (heterokaryotic) Haploid Nuclear fusion Meiosis Mitosis + Sporulation (Ascospores) Fungi from supergroup Unikota Fungi and Animals are Opisthioconts Four Phyla 1. Chytridomycetes 2. Zygomycetes 3. Ascomycetes 4. Basidiomycetes Artificial Classification a. Deuteromycetes: Imperfecti Fungi i. Lack a sexual life cycle, and therefore can not be determined to which other clade they belong Like Animals: Ancestors have 1 flagella on back Differ from Animals: 1. Fungi has cell wall with chitin Chytrids have some cellulose 2. Fungi can not ingest, they are specialized absorbers Have huge vacuole: this is why they pop up right after it rains. i. They grow during summer, when fall rain hits, water is pumped into cells within hours they all pop up. ii. Risotto (seasonal) Groups of Fungi
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1. Chytrids connection from protista (protista shape of fungi) a. No cell walls between cells b. Most unicellular, but some form small nonseptate mycelium (as in Allomyces— best known chytrid ) c. Some are saprobionts, often aquatic d. Some are symbiotic in the Rumen of Ruminantia (Cows) e. Some invade aquatic plants and protists via rhizoids f. Some cause serious diseases of crop plants i. The Potato Wart disease is caused by thesse g. All are Coenocytic with few septa at maturity h. In unicellular Chytrids: entire cell becomes a gametangium (flagellated gametes) or a zoosporangium i. Only group of Fungi with motile reproductive cells i. Gametes could be similar (isogametes) or different, at least one motile j. Sends coenozoic hyphae out like roots to absorb from the environment. k. Differ from other Fugi: 1. Still have cellulose in cell wall
Background image of page 2
2. Still have gametes with flagella (zoospores) l. Some still have zygotic life cycle Sporic Life Cycle --Diploid stage forms chytrid in water, and special cells form sporangia. These thin- walled sporangia come in a double package and breaks open so flagellated zoospores are released. The swin away and form hyphens that expand, and the cycle continues to allow organism to produce very fast. These are genetic clones (single cells). Zygotic Life Cycle --Thick walled cells are sexual. They have melanin for protection from light and form a hard structure. Go through meiosis, haploid formed (haploid phase predominates). The capsule opens and zoospores exit and form the thallus. This forms two different gametes (large and small= isogamy) Syngamy (fertilization) has two steps in which the cells become diploid again: 1) plasmogamy : union of gamete cells 2) karyogamy : union of gamete nuclei
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 21

FUNGI-notes - Ascomycetes: Basidiomycetes: Germination from...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online