Enhancement of plant growth stimulation activity of irradiated alginate by fractionation

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• 作者：Le Quang Luan ; Naotsugu Nagasawa ; Vo Thi Thu Ha ; Nguyen Quoc Hien ; Tomoko M. Nakanishi
• 关键词：Alginate ; Degradation ; Fraction ; Growth stimulation ; Irradiation ; Oligoalginate
• 刊名：Radiation Physics and Chemistry
• 出版年：2009
• 出版时间：September 2009
• 年：2009
• 卷：78
• 期：9
• 页码：796-799
• 全文大小：389 K

文摘

Alginate with the weight-average molecular weight (M_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_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_w approximately 14.2 kDa was found to have a positive influence for growing of barley and soybean. The irradiated oligoalginate fraction with M_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_w in the range 1–3 kDa is a trigger for the growth and development of plants.