Abstract
Mosses have evolved complex mechanisms to overcome abiotic stresses. The phytohormone abscisic acid (ABA) plays an important role in the establishment of stress tolerance in vascular plants as well as in bryophytes. ABA pre‐treatment greatly enhances tolerance to dehydration, cold temperature and osmotic stresses in the mossPhyscomitrella patens. The response to abiotic stresses and ABA inP. patensis accompanied by the accumulation of sugars along with morphological and physiological changes. Some of the genes regulated by ABA inP. patensare also controlled by the ABA‐signalling pathway in vascular plants. However, there are genes expressed in response to ABA and abiotic stress inP. patensthat are not found in seed plants. With the ability to easily delete and replace genes by homologous recombination, as well as a fully sequenced and assembled genome,P. patenswill provide an excellent model for studying stress biology in plants.
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