EFFECTIVENESS OF THE DENITE®CR FOR BIOLOGICAL RECULTIVATION OF HEAVY METALS CONTAMINATED SOIL

Abstract

It is known that heavy metals have high biological activity, ability to bioaccumulate and move along food chains. In this regard, plants that directly absorb heavy metals from the soil play an important role in their accumulation and delivery to the human body, which poses a huge threat to human health.

At the Department of Genetics and Molecular Biology, Kazakh National University. Al-Farabi carried out comprehensive studies to study the effect of cadmium chloride (CdCl₂) and heavy metal immobiliser Denite^®CR on two varieties of soft wheat: Kazakhstanskaya-19 and Samgau. The studies were carried out at the cellular, tissue and organism levels. The object was 14-day-old seedlings of two varieties. The work used cytogenetic, botanical, histological methods, morphometry, biochemistry and biostatistics.

The paper shows that Denite^®CR: (i) reduces the toxic effect of cadmium on cell division of the root system, restores the values of the mitotic index, almost to control values; the binding of cadmium ions contributed to the adaptation of wheat plants to growth in soil contaminated with cadmium at a concentration five times higher than the Maximum allowed concentration; (ii) statistically significantly increases the thickness of the primary root coat up to 31.89% with neutralization of Cd (Maximum allowed concentration + Denite).

Keywords: heavy metals, immobilisation, toxic effect, reclamation, disturbed lands.