Effect of weak constant magnetic field on the composition and content of lipids in radish seedlings at various temperatures |
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Authors: | G V Novitskaya D R Molokanov T K Kocheshkova Yu I Novitskii |
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Institution: | 1.Timiryazev Institute of Plant Physiology,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | We studied the effects of weak permanent homogenous hirizontal magnetic field (PMF) (400 A/m) on the composition and content
of lipids and composition of their fatty acids (FAs) in radish (Raphanus sativus L. var. radicula D.C., cv. Rosovo-krashyi s belym konchikom) seedlings at temperatures of 20 and 10°C. We compared lipid composition and content
in seedlings at the phase of developed cotyledons (20°C, 5-day-old, and 10°C, 8-day-old seedlings) under low light and in
darkness with the lipid composition and content in dry seeds. The seedlings grown in geomagnetic field (GMF) served as a control.
In dry seeds, about 99% of total lipids comprised neutral lipids (NL) and only 1% were polar lipids (PL). Triacylglycerols
predominated among NL comprising 93% of total seed lipids. During seed germination, NLs were consumed and PL were produced:
the amount of glycolipids increased in control by 3.5–5 times and the amount of phospholipis, by 1.5–2 times.In the light
at 20°C, PMF suppressed the formation of PL (by 18%), whereas in darkness, it stimulated it approximately by 80% as compared
with control. In the light at 10°C, PMF slightly stimulated PL formation; in darkness, it did not almost affect their synthesis.
In all treatments, PMF increased the ratio of phospholipids to sterols by 30–100%. Among FA, PMF exerted the strongest effect
on the content of erucic acid: it increased in the light and in darkness at 20°C approximately by 25% and decreased at 10°C
in the light by 13%. PMF behaved as a correction factor affecting lipid metabolism on the background of light and temperature
action. |
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