Stress-induced reactions of mosses to periodic short-term and long-term drying depending on the water regime of their habitats

Bryophytes are poikilohydric higher plants and their water content as well metabolic activity depend on the regime of environment. The aim study was to establish features stress-induced reactions mosses under controlled conditions short-term long-term drying depending habitats. A culture shoots same age from agar mediums level relative humidity used effect periodic drying. Dehydration carried out within 24 hours, removing polyethylene cover pots with moss culture. Plant watering twice a week in variant experiment drying: immediately after dehydration third day In were watered once – 24-hour dehydration. Control sprayed week. significant decrease size shoots, leaves an increase density turf influence have been established, based analysis morphometric parameters Barbula unguiculata Hedw. Physcomitrella patens (Hedw.) Bruch & Schimp. Weissia longifolia Mitt. caused slight leaf elongation comparing control drying, at time activated formation chloronеmal dendroids, which proved its greatest adaptability ability adapt perio­dic changes humidity. sensitivity pigment system B. P. compared W. established. It found that hygromesophytic role belongs chlorophyll b pheophytin b, functioning assimilation complex xeromesophytic depends a, xerophytic due stability strength bound carotenoids protein complexes system. dependence component composition apparatus, bond pigment-protein (PPC), chlorophyllase, total carbohydrate studied duration species characteristics determined.