15_Maloof_Non-Vasc_Plants_Outline

15_Maloof_Non-Vasc_Plants_Outline - Plant Lecture 2:...

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Plant Lecture 2: Non-vascular plants 1) Last lecture we briefly went through the plant tree-of-life. Now we will spend most of our time focused on the three earliest diverging lineages, the liverworts, hornworts, and mosses. a) Common features i) Habitat. Typically grow in dense mats and moist habitats . Why? (1) No root s, so hard to extract water from soil (2) No true vasculature , little or no transport system. Limits transport to diffusion, so stay small. (3) However, there are exceptions. Often are desiccation tolerant . Without roots they almost have to be. (a) in particular, moss grow in some really amazing places: (i) dominant plant above timberline in mountains (ii) Artic Circle (iii) Even are found in Anartica (4) They have swimming sperm that require water for transport. Obviously this is very limiting both in terms of dispersal (mostly mate with neighbors) and timing: (only mate when raining). (a) How are sperm dispersed between plants? The traditional view has been by splashing from raindrops. But some liverworts have developed an interesting mechanical mechanism for sperm dispersal. Show Conocephalum movie. (5) A common life cycle: gametophyte dominant, sporophyte small and dependent on gametophyte 2) Life cycles. All land plants share a sporic life-cycle, but how this is elaborated is different for different species. Understanding these differences is critical to understanding the plant tree of life. a)
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15_Maloof_Non-Vasc_Plants_Outline - Plant Lecture 2:...

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