BIOB50H3 Lecture Notes - Lecture 5: Ruderal Species, Vegetative Reproduction, Asexual Reproduction
2 Aug 2016
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Plants are usually categorized by lifespan (& therefore reproduction): Annuals: complete their lifespan within one growing season. Semelparous. from seed, within one year, not woody, only reproduce once. Seed bank in the soil form the previous generation. The bank can live for thousands of years. Biennials: complete their lifespan over two growing seasons. Perennials: live and reproduce over 3 or more years. Typically, iteroparous. (reproduce many times) roots lives: may require several seasons to reach maturity, may be woody, may have several modes of reproduction. Sexual, vegetative: tequila is from agave"s lifetime sugar storage from the big fat stem, saving account to produce the big flower, the gene lives on but the individual dies. But only reproduce once: tulip has an underground stem; the top leaves will die off but the stem grows new leaves next year. Many traits are determined by competition, environmental stress, and disturbance. Remove whole plants (human is a major source of disturbance)
