首页|COMPOSITION OF SELECTED LIPID FRACTIONS IN 13 ALPINE CRYOPHYTIC PLANT SPECIES GROWING IN THE EASTERN PAMIR MOUNTAINS,TAJIKISTAN
COMPOSITION OF SELECTED LIPID FRACTIONS IN 13 ALPINE CRYOPHYTIC PLANT SPECIES GROWING IN THE EASTERN PAMIR MOUNTAINS,TAJIKISTAN
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NSTL
In high-altitude areas,cryophyte vegetation shapes the ecology of alpine ecosystems.To survive under harsh environmental conditions,these plants employ different physiological and ecological strategies.Among them is the production of diverse lipid compounds,which protect plants against various stresses,including drought,extreme temperatures,UV radiation,and soil salinity.Non-woody aboveground plant organs are covered with a layer of cuticular waxes,containing a complex mixture of long-chain fatty acids,aldehydes,alkanes,akohols,and ketones,which,due to their hydrophobicity,lessen uncontrolled water losses(1,2).In plants exposed to low air temperatures,the content of unsaturated fatty acids increases,which helps to maintain membrane fluidity and chloroplast functioning,thus preventing cold damage(3,4).Lipid secondary plant metabolites(e.g.phenylpropanoids and terpenoids)and neutral lipids(triacylglycerol)play an important role in photoprotection mechanisms,either by effectively absorbing UVA + UVB radiation without promotion of further photochemical reactions or by dissipating excess radiation energy(5,6).Both the maintenance of membrane fluidity under low temperatures and production of photoprotective lipid compounds are plastic responses to variability of climatic factors.Contrastingly,qualitative and quantitative composition of cuticular waxes seems to be more fixed and driven by genetic differences between species and populations rather than short-term climatic variability(7).
NSTL
