bryophytes

bryophytes - Seedless Plants Bryophytes Learning Objective...

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Seedless Plants Bryophytes
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Learning Objective 3 What features distinguish bryophytes  from other plants?
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Bryophytes Nonvascular (lack xylem and phloem) unlike other land plants Dominant gametophyte generation unlike other plants Sporophytes remain permanently  attached nutritionally dependent on gametophytes
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Learning Objective 4 What are the three phyla of  bryophytes?
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Mosses  (Phylum  Bryophyta ) Gametophytes are green plants that  grow from a filamentous  protonema  
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Liverworts  (Phylum  Marchanchiophyta   or old name  Hepatophyta ) Many gametophytes are flattened,  lobelike thalli (others are leafy)
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Hornworts  (Phylum  Anthocerophyta ) Have thalloid gametophytes
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Fig. 27-5, p. 585
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Fig. 27-5 (1), p. 585 Nonvascular bryophytes Vascular seedless plants seed plants Green algal ancestor
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    KEY CONCEPTS Mosses and other bryophytes lack  xylem and phloem tissues, and do not  form true roots, stems, or leaves
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Mosses Occur in a wide range of habitats from  Occur in a wide range of habitats from  the arctic to the tropics and from xeric  the arctic to the tropics and from xeric  (dry) to hydric (wet) environments. (dry) to hydric (wet) environments.
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Bryophyta Common name Mosses  Synonyms Muscophyta  Growth habit Multicellular: “stems and leaves”  Two whiplash flagella on sperm
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Bryophyta Conductive cells Conductive cells Leptoids (food) and hydroids (water)  Leptoids (food) and hydroids (water)  Clonal reproduction Clonal reproduction Gemmae (multicellular propagules)  Gemmae (multicellular propagules)  Sexual reproduction Sexual reproduction Homosporous  Homosporous  Heterothallic sporic meiosis Heterothallic sporic meiosis
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Bryophyta Representative genera Representative genera Mnium Mnium Polytrichum, Sphagnum Polytrichum, Sphagnum     Recognized by Recognized by Sporophytes with long setae and  Sporophytes with long setae and  peristomes peristomes Leafy gametophytes  Leafy gametophytes 
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Learning Objective 5 Describe the life cycle of mosses Compare their gametophyte and  sporophyte generations
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Mosses 1 Green moss  gametophyte bears  archegonia  /  antheridia  at top of  plant  Fertilization sperm cell fuses with egg cell in  archegonium ( zygote )
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Mosses 2 Zygote grows into  embryo develops into moss sporophyte attached to  gametophyte
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Mosses 3 Meiosis occurs within  capsule  of sporophyte produces  spores   When spore germinates grows into a  protonema forms buds that develop into gametophytes
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Moss Life Cycle
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Fig. 27-6, p. 586 Gametophyte plants Antheridia at the tip of the gametophyte shoot Buds on protonema 1 Antheridia
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This note was uploaded on 06/23/2011 for the course BIO 112 taught by Professor Dr.dertein during the Spring '11 term at St. Xavier.

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bryophytes - Seedless Plants Bryophytes Learning Objective...

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