Membrane phospholipid composition during maturation of seeds of Acer platanoides and Acer pseudoplatanus in relation to desiccation tolerance

Membrane phospholipid composition was investigated in seeds of two species from the genus Acer: Norway maple (Acer platanoides L.) — tolerant to desiccation, and sycamore (Acer pseudoplatanus L.) — intolerant to desiccation, during their maturation, from 1 August to 25 September 1995, at weekly intervals. Seeds of Norway maple acquire tolerance to desiccation at the end of August ie. about 125 days after flowering (DAF). Phospholipid composition during development revealed marked differences between studied seeds. Seeds of Norway maple after acquiring tolerance to desiccation contained much more phosphatidylcholine (PC) and phosphatidylethanolamine (PE), compared to sycamore. The ratio of PC/PE in mature Norway maple seeds was evidently higher than those in sycamore. The level of unsaturated fatty acids in the phospholipid fraction substantially increased in Norway maple seeds during development and the saturation of PC and PE was less than in sycamore. The results suggest that phospholipid composition may be involved in desiccation tolerance of Norway maple seeds.