BIOL 1050 Lecture Notes - Lecture 7: Root Nodule, Nitrogenase, Mycorrhiza
19 Nov 2016
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Document Summary
Shade leaves are thinner and broader to capture as many photons as possible. Red light receptors: phytochromes: 660-730 nm, monocots have three genes for photoreceptors, dicots have five genes for photoreceptors. Sense competition through changes in light quality. Changes in light quality are observed through frequency detection, wavelength detection. Phytochrome detects this change in light intensity: chromophore: the element that reacts to different light signals in the phytochrome and it responds to red or far red ratios. Red vs far red light responses: chromophore changes its protein 3d configuration and can lead to expression or shut down expression of certain genes. The responses of plants from competition are different for different types of plants: Sun plants: stem elongation occurs in response to competition. Facultative species have root shoot alteration and establish themselves with root systems to survive longer. Daylength responses to competition: due to phytochrome system: Alteration or manipuluation of phytochrome systems can change daylength responses.
