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Announcements No quiz in lab on Friday -- be prepared for conifer walk outside

Announcements No quiz in lab on Friday -- be prepared for conifer walk outside. Plants are sessile and modular. vs. Some consequences of being a plant c an make own food (photosynthesis) can grow indefinitely & survive major damage BUT, can’t go look for a better place

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Announcements No quiz in lab on Friday -- be prepared for conifer walk outside

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  1. Announcements • No quiz in lab on Friday • -- be prepared for conifer walk outside

  2. Plants are sessile and modular vs.

  3. Some consequences of being a plant • can make own food (photosynthesis) • can grow indefinitely & survive major damage BUT, can’t go look for a better place  local competition for resources  evolution of fungal/bacterial symbioses  evolution of seed dispersal mechanisms can’t go look for mates  evolution of pollination mechanisms

  4. Competition for light affects plant growth form  over evolutionary time  over individual lifespans

  5. Angiosperm vegetative terminology

  6. Cauline leaves (on shoot) Angiosperm vegetative terminology Basal leaves (at base of shoot)

  7. terminal (apical) bud Angiosperm vegetative terminology internode axillary bud leaf! node stem

  8. terminal (apical) bud Angiosperm vegetative terminology internode axillary bud leaf! node stem or shoot opposite leaves alternate whorled

  9. Leaf parts Leaf venation margin midvein dichotomous pinnate blade petiole stipule palmate parallel

  10. Leaf forms Leaf margins entire dentate simple unlobed simple lobed simple lobed (palmate) compound (palmate) compound (pinnate) compound (twice pinnate)

  11. How to figure out what is a leaf axillary bud is always at base of the leaf (above the petiole)

  12. How to figure out what is a leaf axillary bud is always at base of the leaf (above the petiole) 1 leaf

  13. Plant water relations Leaves need to uptake gas (CO2) for photosynthesis, but also need to minimize loss of H2O through leaves mesophyll w/chloroplasts vein w/vascular tissue (water , sugar ) stoma w/guard cells (regulates gas exchange) waxy cuticle (blocks water loss)

  14. Succulents (modified for water storage)

  15. Sagebrush foliage - Adaptation to dry/high sun conditions Artemisia tridentata (Asteraceae)

  16. Roots • anchoring • water and nutrient absorption • water and carbohydrate storage Taproot Fibrous roots Adventitious roots

  17. Tap roots

  18. Fibrous roots

  19. Storage roots ?

  20. Modified stems rhizome - horizontal stem (generally underground) shoot buds rhizome stem roots tuber (extra starchy rhizome)

  21. Modified stems stolon - aboveground horizontal stem with long internodes Fragaria Saxifraga plantlets

  22. Fragaria Saxifraga

  23. Asexual or clonal reproduction Modularity  continuum between growth and reproduction Fragaria Saxifraga Definition of “individual” depends on perspective genetic individual --> “genet” growth unit --> “ramet”

  24. Saxifraga Populus tremuloides (Aspen)

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