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Rice Root Growth with Increasing in Plant Hormone and Allantoin by Inosine in Nutrient Solution

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Title: Rice Root Growth with Increasing in Plant Hormone and Allantoin by Inosine in Nutrient Solution
Authors: Tokuhisa, Dai Browse this author
Okazaki, Keiki Browse this author
Shinano, Takuro Browse this author
Watanabe, Toshihiro Browse this author
Yokoi, Daisuke Browse this author
Osaki, Mitsuru Browse this author
Issue Date: 14-Aug-2009
Publisher: University of Califolnia, Davis, Dept. of Plant Sciences
Journal Title: The Proceedings of the International Plant Nutrition Colloquium
Volume: 16
Start Page: Paper 1171
Abstract: The presence of low concentration of inosine in solution in soil has increased the root growth as shown in our previous work. Thus the aim of this work was to clear the mechanism of the inosine-induced enhancement of root growth with emphasis on plant hormone and metabolites profile. In the first experiment the rice plant (Oryza sativa L. cv Nipponbare) was precultivated in nutrient solution for 3 weeks. Then seedlings with the same size were transferred to pots with the following treatment solutions (0 N + 0 inosine, 0 N + 20 mg L^[-1] inosine, 4 mg L^[-1] N + 0 inosine and 4 mg L^[-1] N + 20 mg L^[-1] inosine). Two weeks after the treatment started, xylem sap was collected for determining cytokinin and auxin concentration by ELISA, then fresh and dry weight of shoot and root, and root length were measured. In the second experiment, rice seedling were prepared as Experiment 1 then samples were collected after inosine treatment (0, 1, 2, 24, 72, and 96 hours) for the analysis of metabolites profiling by using GC-MS. Dry weight (shoot and root), and root length and number of lateral root were measured. As a result, inosine application increased root length and concentrations of trans-zeatin riboside and indole-3-acetic acid content in xylem sap significantly. The allantoin was the most up regulated compound in the metabolite profile. Thus, it is suggested that inosine application increased concentration of plant hormones and allantoin, possibly resulting in growth enhancement of plant root.
Description: XVI International Plant Nutrition Colloquium, Plant Nutrition for Sustainable Development and Global Health. 26-30 August 2009. Sacramento, California, USA.
Conference Name: International Plant Nutrition Colloquium, Plant Nutrition for Sustainable Development and Global Health
Conference Sequence: 16
Conference Place: Sacramento, California
Type: proceedings (author version)
URI: http://hdl.handle.net/2115/39316
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Dai Tokuhisa

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