Plantas vasculares primitivas

Plant Diversity I Level 1 Biological Diversity Jim Provan Campbell: Chapter 29

Main groups of land plants ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Highlights of plant evolution Simple charophyceans Complex charophyceans Mosses Liverworts Hornworts Lycophytes Ferns, horsetails, whisk ferns Gymnosperms Angiosperms

Ten phyla of extant plants Common name Approximate number of extant species Nonvascular plants (bryophytes) Division Bryophyta Division Hepatophyta Division Anthocerophyta Vascular plants Seedless vascular plants Division Lycophyta Division Pterophyta Seed plants Gymnosperms Division Coniferophyta Division Cycadophyta Division Gingkophyta Division Gnetophyta Angiosperms Division Anthophyta Mosses Liverworts Hornworts Lycophytes Ferns Conifers Cycads Gingko Gnetae Flowering plants 12,000 6,500 100 1,000 12,000 550 100 1 70 250,000

Plants probably evolved from green algae called charophytes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Differences between plants and charophycean algae ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Alternation of generations (continued) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Alternation of generations in plants may have originated by delayed meiosis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Alternation of generations in plants may have originated by delayed meiosis Meiosis delayed Zygotic mitosis produces multicellular sporophyte

Adaptations to shallow water preadapted plants for living on land ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The embryophyte adaptation evolved in bryophytes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The gametophyte is the dominant generation in the life cycle of bryophytes

Mosses (Division Bryophyta) ,[object Object],[object Object],[object Object],[object Object]

Liverworts (Division Hepatophyta) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Hornworts (Division Anthocerophyta) ,[object Object],[object Object],[object Object]

Additional terrestrial adaptations in vascular plants ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The sporophyte-dominant life cycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A sporophyte-dominant life cycle evolved in seedless vascular plants MITOSIS

Lycophytes (Division Lycophyta) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Horsetails (Division Sphenophyta) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ferns (Division Pterophyta) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Plantas vasculares primitivas

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Plantas vasculares primitivas