Freezing tolerance of photosynthetic apparatus in the homoiochlorophyllous resurrection plant Haberlea rhodopensis

摘要: Abstract Haberlea rhodopensis is unique among homoiochlorophyllous resurrection plants with its ability to tolerate also low temperatures at temperate climate. This study was carried out elucidate the response and acclimation of photosynthetic apparatus cold capacity freezing temperatures. Cold acclimated experienced short-term conditions under controlled-environment in climatic chamber long-term subzero winter an ex-situ natural environment. Our results indicated strong tolerance after acclimation. In fact, fresh leaves were exposed survived stress both controlled conditions, thus confirming their appropriate Freezing induced desiccation corresponding ultrastructural changes mesophyll cells ex situ environmental conditions. However, while complete rearrangement commenced 20 % RWC drought stress, this process started already 60 The presence epidermal channels on leaf sides observed role for fast water loss proposed. It found that freezing-induced desiccation, reversible downregulation photosynthesis, readjustments abundance/organization pigment protein complexes main proteins together increased thermal energy dissipation during chilling enable survive harsh recovery onset spring. Low temperature responses are discussed comparison desiccation-induced point common specific features.