BIOL 2242 Lecture Notes - Lecture 22: Vascular Bundle, Abaxial, Primordium

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 2242
• Professor: Isobel Waters

Document Summary

Leaf anatomy: i) mesophytic (middle of the road water) eudicot (fig. Photosynthesis but fewer chlororplasts (cid:523)because they don"t get. Gas exchange for entire mesophyll us as much light: xylem to adaxial. Tracheids and small vessels because high tension: phloem to abaxial. A few sieve tubes and companion cells: bundle sheath. Sun leaves (a) and shade leaves (b), p. 602: many eudicots leaves in full, sun develop denser palisade (2-3 cells, shade leaves are thinner, with less organized palisade, phenotypic plasticity. Supplements genetically fixed differences among and within species. Note: extrafloral nectaries some plant provide nectar (sugar water) for ants, who will defend the plant as it is a resource rather than defending the aphids (who excrete sugar). 25. 24: netted (reticulate) venation in eudicot leaf, cottonwood (populus deltoids, divides mesophyll into subregions called areoles (like animal capillaries) Summer 2017: more chloroplasts than in spongy, veins, secondary wall thickenings visible on vessels, note parenchyma bundle sheath on minor veins.