Wheat and barley dehydrins under cold, drought, and salinity – what can LEA-II proteins tell us about plant stress response?

Abstract

Dehydrins as a group of late embryogenesis abundant II proteins represent important dehydration-inducible proteins whose accumulation is induced by developmental processes (embryo maturation) as well as by several abiotic stress factors (low temperatures, drought, salinity). In the review, an overview of studies aimed at investigation of dehydrin accumulation patterns at transcript and protein levels as well as their possible functions in common wheat (Triticum aestivum), durum wheat (T. durum), and barley (Hordeum vulgare) plants exposed to various abiotic stress factors (cold, frost, drought, salinity) is provided. Possible roles of dehydrin proteins in an acquisition and maintenance of an enhanced frost tolerance are analyzed in the context of plant developmental processes (vernalization). Quantitative and qualitative differences as well as post-translational modifications in accumulated dehydrin proteins between barley cultivars revealing differential tolerance to drought and salinity are also discussed. Current knowledge on dehydrin role in wheat and barley response to major dehydrative stresses is summarized and the major challenges in dehydrin research are outlined.

Physiological and Molecular Responses to Controlled Severe Drought in Two Barley (Hordeum VulgareL.) Genotypes

“…Dehydrins are group of late embryogenesis-abundant II proteins induced during certain developmental stages and by abiotic stresses (Close 1996;Hanin et al 2011;Kosová et al 2014). Based on the increase of their expression under different drought regimes, two dehydrins genes, HvDHN1 and HvDHN9, were chosen (Choi et al 1999;Suprunova et al 2004;Karami et al 2013).…”

Low temperature tolerance in plants: Changes at the protein level

“…They are largely hydrophilic proteins that contain different amounts of K-segments (lysine-rich repeats), S-segments (tract of serine residues), and Ysegments (conserved N-terminal sequence) (Svensson et al, 2002). Dehydrins are often responsive to short-term LT (cold acclimation), vernalization and phenological development (Kosová et al, 2014b). They are localized to the cytoplasm or nucleus, depending on the cell type.…”

“…Although barley is comparatively the most tolerant cultivated Triticeae species with respect to dehydrative stresses, particularly drought and salinity, in general it represents less freezing tolerance at the end of cold acclimation phase when compared with wheat cultivars with same growth habits (Kosová et al, 2014b). In spring barley, early maturing can be considered as the basic trait involved in adaptation to the environment.…”

Effects of salt and heat pre-treatment factors on efficient regeneration in barley (Hordeum vulgare L.)

“…Temperatures and drought stress pre-treatment factors are associated with plant The values followed by different letters in a column are significantly different at P \ 0.05 according to Duncan's multiple range test (DMRT) cell dehydration. Dehydration stress factors induce profound cellular response aimed at an elimination of water loss (Kosová et al 2014). The experimental results showed that desiccation could increase shoot regeneration of treated calluses derived from the tested barley genotypes, but the increasing efficiency was crucially dependent on the degree of temperature.…”