BIOL 1902 Lecture Notes - Monotropa Uniflora, Viburnum Lantanoides, Phototropism
Document Summary
Plants face another nutritional challenge: lack of sunlight (shade) Some shade plants have leaves with a large surface area. Round-leaved orchids have large leaves parallel to the ground. Bunchberries exhibit clonal growth leaves are attached to a common rhizome (clones: can have big leaves or many leaves for this adaption. Phototropism growing towards the light (moving) Tendrils are thigmotropic really sensitive, more than fingertips. So it can wrap around plant and climb on it. Trilliums have another solution to the shade problem. Many species of spring ephemerals grow in deciduous forests. Another solution is to lose the need for sunlight: striped coralroot (no leaves) Coralroots attain nutrients from mycorrhizae associated with other plants. Indian pipe does not need sunlight: mycorrhizal associations. Shade-dwelling orchids: photosynthesize and steal carbon from other plants through mycorrhizae, mixotrophs. Cancerroot has no leaves and no mychorrhiza.