Title
Wastes from forestry and energy industries as potential bioregulators in soybean (Glycine max L.) plants
Authors
CORNELIU TANASE SILVIA OROIAN SANDA-LILIANA COSARCA and VALENTIN I. POPA

Received This article is dedicated to the anniversary of 50 years since the founding of the Cellulose Chemistry and Technology journal. On this anniversary, we hope that both the editorial board members and collaborators will contribute further to increa
Published Volume 50 Issue 5-6 May-June
Keywords bioregulators, deuterium depleted water, polyphenols, spruce bark

Abstract
Polyphenols are the only group of phytochemicals present in all plants. Their activity is based upon functional groups capable of accepting a free radical’s negative charge. In our experiments, we have evaluated the effect of spruce bark polyphenolic extract (SBPE) and deuterium depleted water (DDW) as soybean plant bioregulators. After aqueous extraction and quantification, as well as identification of polyphenolic compounds by HPLC methods, we applied the extracts obtained, together with DDW,in the growth medium of soybean plants. The biological activity of SBPE and DDW was assessed by determining the germination energy and capacity, biomass accumulation, assimilatory pigment accumulation, photosynthesis activity, substomatal cavity CO2 concentration, transpiration and respiration rate, as well as photosynthetically active radiation (P.A.R.) of the leaf surface. The obtained results showed that the highest stimulating effect on germination energy and capacity was registered in the presence of DDW in combination with spruce bark polyphenolic extract (SBPE). Soybean plants treated with SBPE reached the highest amount of biomass, compared to the other experimental variants. DDW, in combination with SBPE, enhanced the assimilatory pigment accumulation in soybean plants. The photosynthesis activity, transpiration and respiratory processes were considerably intensified, especially in the presence of SBPE.