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Lab 7 Heterokonts. Common name: None Synonyms: Stramenopiles (the photosynthetic heterokonts are sometimes called chromists) Mode of nutrition: Autotrophic;

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Presentation on theme: "Lab 7 Heterokonts. Common name: None Synonyms: Stramenopiles (the photosynthetic heterokonts are sometimes called chromists) Mode of nutrition: Autotrophic;"— Presentation transcript:

1 Lab 7 Heterokonts

2 Common name: None Synonyms: Stramenopiles (the photosynthetic heterokonts are sometimes called chromists) Mode of nutrition: Autotrophic; brown chloroplasts; or saprophytic, parasitic Habitat: Freshwater, marine, terrestrial Growth habit: Unicellular, filamentous, various multicellular Cell wall: Cellulose, silica, alginic acids

3 Heterokonts Undulipodia (flagella): One tinsel, usually also one whiplash Food storage: glycogen, laminarin, lipid Clonal reproduction: zoospores Sexual reproduction: Unicellular, haploid dominant, diploid dominant, alternation of generations Included Phyla: Oomycota, Bacillariophyta, Phaeophyta Recognized by: Tinsel undulipodia

4 Oomycota General features of the heterokonts Common name: Egg fungi, water molds Synonyms: None (sometimes included in the Phycomycota of old references; but the name properly applies to the Zygomycota) Mode of nutrition: Heterotrophic; saprophytic or parasitic Habitat: Freshwater or within host organism (which may be a terrestrial plant) Growth habit: Multicellular mycelium of aseptate hyphae

5 Oomycota Cell wall: Cellulose Undulipodia (flagella): One whiplash, one tinsel Food storage: Glycogen Clonal reproduction: Zoospores Sexual reproduction: Diploid dominant, oogamous Representative genera: Phytophthora, Pythium, Saprolegnia Recognized by: Oogonia with 4, 8, or 16 eggs.

6 Saprolegnia sexual cycle Oomycota

7 Bacillariophyta General features of the heterokonts Common name: Diatoms Synonyms: Chrysophyta (in part) Mode of nutrition: Autotrophic; brown chloroplasts Habitat: Marine, freshwater, rarely moist terrestrial Growth habit: Unicellular, filamentous Cell wall: Silica, cellulose

8 Bacillariophyta Undulipodia (flagella): One tinsel, on sperm cells of one Class; otherwise none. Food storage: Lipid Clonal reproduction: Mitosis of unicells Sexual reproduction: Diploid-dominant, oogamous Representative genera: Bacillaria, Melosira Recognized by: Glassy Cell walls with precise pores and sculpturing

9 Living diatoms Bacillariophyta

10 Diatoms, marine Bacillariophyta

11 Diatom arranged slide Bacillariophyta

12 Diatom arranged slide Bacillariophyta

13 Diatomaceous earth Bacillariophyta

14 Melosira Bacillariophyta

15 Phaeophyta General features of the heterokonts Common name: Brown algae Synonyms: None Mode of nutrition: Autotrophic; brown chloroplasts Habitat: Marine Growth habit: Multicellular; parenchymatous, filamentous Cell wall: Cellulose, alginic acids

16 Phaeophyta Undulipodia (flagella): One whiplash, one tinsel Food storage: Laminarin (mannitol for transport) Clonal reproduction: Zoospores Sexual reproduction: Isomorphic or heteromorphic alternation of generations, or diploid-dominant; isogamous or oogamous Representative genera: Ectocarpus, Fucus, Laminaria, Macrocystis, Zonaria Recognized by: Multicellular brown seaweeds

17 Ectocarpus plurilocular sporangium Phaeophyta

18 Ectocarpus unilocular sporangium Phaeophyta

19 Zonaria antheridia Phaeophyta

20 Zonaria oogonia Phaeophyta

21 Zonaria meiosporangia Phaeophyta

22 Laminaria Phaeophyta

23 Laminaria Phaeophyta

24 Macrocystis stipe, cross section Phaeophyta

25 Fucus Phaeophyta

26 Fucus Phaeophyta

27 seaweeds Phaeophyta

28 kombu Phaeophyta

29 wakame Phaeophyta


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