Studies of Physcomitrella patens reveal that ethylene-mediated submergence responses arose relatively early in land-plant evolution.

Abstract excerpt

Colonization of the land by multicellular green plants was a fundamental step in the evolution of life on earth. Land plants evolved from fresh-water aquatic algae, and the transition to a terrestrial environment required the acquisition of developmental plasticity appropriate to the conditions of water availability, ranging from drought to flood. Here we show that extant bryophytes exhibit submergence-induced...

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