Fatty acid composition of total lipids from the needles of pine seedlings as related to boron availability

The effect of boron availability on the content of fatty acids (FA) in the total lipids of needles was investigated in two-year-old seedlings of Scots pine (Pinus sylvestris L.). The study was conducted in the forest nursery on the soil deficient in boron. Various rates of boric acid (0.01, 0.03, 0.1, 0.3, 1, 3, and 10 g/m²) were applied to soil three times throughout the growth period. When pine seedlings were supplied with extra boron, the lipid content of the seedling needles declined. The optimal boron supply elevated the content of saturated FA in total needle lipids mostly at the expense of palmitic acid, with a corresponding decline in the level of unsaturated FA and unsaturation index of FA owing to trienoic FA (mainly linolenic and hexadecatrienoic acids). At the same time, the level of monoenoic and to a lesser degree dienoic acids increased. When boron supply of the seedlings was not optimal, the content of unsaturated and low-molecular FA increased.     

Somatic Embryogenesis and Morphogenetic Potential of Spring Barley (Hordeum vulgare L.) in the System of Technological Genetic Transformation

We studied somatic embryogenesis and morphogenetic potential in young embryos of 17 spring barley cultivars. A considerable effect of the genotype as well as of certain biologically active compounds in the growth medium on the frequency of embryogenic callus formation and regenerative capacity was observed. The Murashige and Skoog medium complemented with myoinositol and casein hydrolysate is suitable for embryogenic callus induction. The regeneration medium should be complemented by hormones, 2.5 mg/l auxin 2,4-D and 0.1–0.5 mg/l cytokinin 6-BAP, to increase the frequency of somatic embryo maturation. The presence of cefotaxime and high level of copper are desirable to increase the efficiency of callogenesis, regeneration, and callus quality. Three cultivars with economically valuable characters and high morphogenetic potential were recommended for development of efficient technology for barley transformation.     

Fatty Acid Composition in Fractions of Total Lipids from the Buds of Plants of the Betula L. Genus by the Opening Phases

Russian Journal of Plant Physiology - The fatty acid composition (FAC) of fractions of organic compounds isolated from total lipids (TL) by successive solvents—chloroform, acetone, and...     

Arginine in the life of coniferous plants

This review summarizes the results of long-term studies of the arginine status in coniferous plants. The characteristics of the arginine metabolism in coniferous species; its annual and daily dynamics; and the effect of temperature, light, and mineral nutrition on the accumulation of this amino acid in plant organs and tissues are described. Methods for increasing the arginine content in coniferous plants via regulating their mineral nutrition are discussed.     

Content and Composition of Fatty Acids in Total Lipids from the Buds of Betula pubescens,B. pendula,and B. pendula var. carelica

Russian Journal of Plant Physiology - Absolute content and composition of fatty acids (FAs) in total lipids from the buds of white birch (Betula pubescens Ehrh.), silver birch (B. pendula Roth),...     

The Technique of Water Extract Preparation from Goat Willow Leaves with Allowance for Circadian Rhythm of Their Biological Activity to Stimulate Scots Pine Seed Germination

Russian Journal of Plant Physiology - The preparative technique for water extraction of goat willow (Salix caprea L.) growing leaves was elaborated in order to stimulate Scots pine (Pinus...