BIO 203 Lecture Notes - Lecture 31: Lichen, Green Manure, Archaea
1 Dec 2016
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Mutualisms are mutually beneficial relationships among organisms of. A mutualism requires each partner to pay a (cid:498)price(cid:499) in return for that benefit. The price each partner pays relates directly to its organismal biology. An even bigger dilemma for the plants. Why would low n availability make a plant less green: because nitrogen is part of chlorophyll, so without it, cannot produce enough pigment. Legumes and other plants host mutualistic n-fixing bacteria in root structures called nodules: in-house fertilizer production. Reaction carried out by nitrogenase enzyme complex. Several bacterial and archaeal lineages are unique in possessing the ability to carry out this reaction. Plant contributes food, lodging, and leghemoglobin to create the anoxic conditions needed for reaction to occur. Legumes (angiosperms) and rhizobium = most common association. Alder (angiosperm) and frankia produces a distinctive nodule. Azolla is a tiny water fern; worldwide distribution including wi (often.
