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Report No.

Enhancement of plant growth stimulation activity of irradiated alginate by fractionation

Luan, L. Q.*; Nagasawa, Naotsugu; Ha, V. T. T.*; Hien, N. Q.*; Nakanishi, Tomoko*

Alginate with the weight-average molecular weight ($$M$$$$_{rm w}$$) approximately 900 kDa and ratio of M (mannuronate)/G (guluronate) about 1.3 was irradiated by $$gamma$$ Co-60 in aqueous solution at doses up to 200 kGy. The irradiation dose was shown to be a function for reducing $$M$$$$_{rm w}$$ and molecular weight distribution of irradiated alginates. The distribution of oligomer fractions in irradiated products was also investigated by separation using ultrafiltration membranes. The irradiated alginate with $$M$$$$_{rm w}$$ approximately 14.2 kDa was found to have a positive influence for growing of barley and soybean. The irradiated oligoalginate fraction with $$M$$$$_{rm w}$$ ranging from 1 to 3 kDa displayed the strongest effect on the growth and development of the mentioned plants at low concentration (20 ppm). It is suggested that oligoalginate with $$M$$$$_{rm w}$$ in the range 1-3 kDa is a trigger for the growth and development of plants.



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Category:Chemistry, Physical



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