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Membrane Lipid Composition upon Normal and Patterned Wood Formation in Betula Pendula Roth

Novitskaya, Ludmila L., Shulyakovskaya, Tamara A., Galibina, Natalia A., Ilyinova, Maria K.
Journal of plant growth regulation 2018 v.37 no.3 pp. 958-970
Betula pendula, cambium, cell death, cell membranes, dienoic fatty acids, functional properties, glycolipids, lipid composition, metabolism, parenchyma (plant tissue), phospholipids, protoplasts, saturated fatty acids, wood, wood anatomy
A comparative study of two forms of Betula pendula Roth differing in wood structure (B. pendula var. pendula with common straight-grained wood and B. pendula var. carelica with abnormal patterned wood) has demonstrated that the level of phospholipids reflects the content of parenchyma cells in the wood and can be regarded as an indicator of the abnormality degree in the tissue structure. The content of glycolipids testifies to the dynamics of the plastid apparatus condition and correlates with the activity of the storage function in the wood parenchyma cells. It is shown that two directions in the differentiation of cambial derivatives, namely by the pathway of cell death (vessels and fibrous elements) and the preservation of a live protoplast (parenchyma cells), correlate with different fatty acid compositions of membrane lipids. In the first case, the share of saturated fatty acids in the composition of phospholipids and glycolipids increases, indicating a deterioration of the functional characteristics of cell membranes. In the latter case, the share of unsaturated, mainly dienoic fatty acids, increases, which reflects a rise in the activity of cell membranes. During periods with the highest rate of metabolism, the content of polyunsaturated, mainly trienoic fatty acids increase in membrane lipids.