Notes On ' On Land And ' Water ' By Kyle Dean

984 Words Mar 23rd, 2016 4 Pages
Terrestrialization on Land or in Water
By Kyle Dean
The movement to land by plants has been a point of great interest for many researchers. The complexity of the situation is in the characterization of those traits that were most essential to the viability on land, and whether those traits developed prior to terrestrialization or post terrestrialization. This complexity stems from the long branch of phylogeny leading to terrestrialization having an incomplete fossil record due to environmental changes throughout time. The gold standard hypothesis on terrestrialization introduced by Bower is accepted in the scientific community as the explanation for terrestrial plant diversification of plant orders and families. Bower’s hypothesis articulates, “that the evolution of antithetic alternating life cycles was instrumental in adapting to the terrestrial habitat. (Harholt et al., 2016)” In other words the development of the free living sporophyte and gametophyte was critical to a plants ability to live on land. This information if taken only to mean the diversification of land plant orders and families is accepted by most without question, for the alternating life cycle is imperative to suitability of land plants; however, if Bower intended for his hypothesis to be inclusive of the primordial terrestrialization then his hypothesis has encountered some criticism. Stebbins and Hill in 1980 conducted research that concluded with the premise that unicellular charophytes invaded…
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