Esterase spectra and adaptive plasticity in rice varieties

Analysis of the esterase spectra was performed on 27 rice varieties which differ in the duration of the vegetation period (early, medium-, and late-ripening varieties) and in the roots, stem, and leaf blades. Organ-and variety-specific differences were found in 5 esterase loci. Late-ripening rice varieties were characterized by lower resistance to salinization and thickening of crops, but not to higher temperatures. A definite correlation was revealed between these differences and those observed in the tissue-specific esterase spectra. Typical for early and medium-ripening varieties were genotypes with nonzero activity by esterase locus 1 (isoferment with the highest electrophoretic mobility), as well as its expression in various tissues simultaneously.     

Monitoring data on ameliorative status of agrolandscape

Long-term monitoring data on the ameliorative status of soils in the agrolandscape of a terminal moraine ridge are given. The effect of agroclimatic factors and specific features of the agrolandscape of the experimental station on groundwater level and moisture content in soil horizons are shown. The differentiation of agroameliorative measures for optimizing water–physical soil properties in different parts of the agrolandscape is substantiated.     

Peculiar properties of the composition of the organic matter of the original forest Phaeozems soils of the northeast of Kostroma oblast

The composition of the organic matter of the forest Phaeozem soil of Kostroma oblast, which is unusual in its genesis, was investigated by the method of physical fractionation. The Phaeozems were formed in an automorphic position on loamy sediments of Triasic age. The carbon distribution in fractions of organic substance (OS) is the evidence of the hydromorphic nature of the OS origin. A hypothesis about the cause of the formation of the modern organic profile of the soil during evolution is discussed.