Boron deficiency-induced impairments of cellular functions in plants

摘要: The essentiality of B for growth and development plants is well-known, but the primary functions still remain unknown. Evidence in literature supports idea that major are based on its ability to form complexes with compounds having cis-diol configurations. In this regard, formation constituents cell walls plasma membranes as well phenolic seems be a decisive step affecting physiological B. Boron crucial importance maintenance structural integrity membranes. This function mainly related stabilisation by association membrane constituents. Possibly, may also protect against peroxidative damage toxic O2 species. B-deficient plants, highly leaky lose their functional integrity. Under conditions, substantial changes ion fluxes proton pumping activity were noted. Impairments phenol metabolism increases levels phenolics polyphenoloxidase typical indications deficiency, particularly deficiency-sensitive plant species, such Helianthus annuus (sunflower). Enhanced oxidation phenols responsible generation reactive quinones which subsequently produce extremely thus resulting increased risk vital components lipids proteins. tissues, enhancement species occur result impairments photosynthesis antioxidative defence systems. Recent evidence shows ascorbic acid, non-protein SH-compounds (mainly glutathione) glutathione reductase, systems cells reduced response deficiency. There increasing that, heterocyst cyanobacteria, involved protection nitrogenase damage.