Arabinose-rich polymers as an evolutionary strategy to plasticize resurrection plant cell walls against desiccation

摘要: A variety of Southern African resurrection plants were surveyed using high-throughput cell wall profiling tools. Species evaluated the dicotyledons, Myrothamnus flabellifolia and Craterostigma plantagineum; monocotyledons, Xerophyta viscosa, schlecterii, humilis grass Eragrostis nindensis, as well a pteridophyte, fern, Mohria caffrorum. Comparisons made between hydrated desiccated leaf frond material, with respect to composition polymer abundance, monosaccharide analysis, FT-IR spectroscopy comprehensive microarray in combination multivariate data analysis. The obtained suggest that three main functional strategies appear have evolved prepare plant walls for desiccation. Arabinan-rich pectin arabinogalactan proteins are found fern M. caffrorum basal angiosperm where they act ‘pectic plasticizers’. Dicotyledons pectin-rich walls, such C. plantagineum, seem use inducible mechanisms which consist up-regulating osmoprotectants. hemicellulose-rich grass-like spp. E. nindensis contain highly arabinosylated xylans proteins. These support general mechanism ‘plasticising’ desiccation implicate arabinose-rich polymers (pectin-arabinans, arabinoxylans) major contributors ensuring flexibility is maintained rehydration facilitated these plants.