BIOL 1902 Lecture Notes - Lecture 17: Viburnum Lantanoides, Phototropism, Cornus Canadensis
14 Nov 2016
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Some shade plants have leaves with a large surface area: ex. Round-leaved orchid parallel to the ground: ex. Hobblebush have large leaves (natures toilet paper) Thin, flat leaves offer other advantages: less energy spent in building support tissues, light reaches photosynthesis cells more quickly, supresses competition. Chlorophyll b (more common) > chlorophyll a. Clonal or colonial growth have a lot of leaves: ex. Another way to beat the shade is to grow away from it: Cells that detect sunlight phototropism: positive phototropism towards the sunlight, negative phototropism away from the sunlight. Wild cucumber have tendrils (twisted vines like a slinky) which are thigmotropic (respond to touch when they feel a plant they wrap around) Trilliu(cid:373)"s bloom in the early spring bloom before the leaves on the trees bloom. Many spring ephemerals grow in deciduous forests. Lose the need for sunlight no leaves: ex. Coral roots are beautiful orchids that live like thieves steal nutrition (foods) from other plants.
