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Effect of panicle removal on cytokinin level in the xylem and nitrogen uptake activity of rice

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Title: Effect of panicle removal on cytokinin level in the xylem and nitrogen uptake activity of rice
Authors: SHINANO, Takuro Browse this author
OSAWA, Motonari Browse this author
SOEJIMA, Hiroshi Browse this author
OSAKI, MITSURU Browse this author →KAKEN DB
Keywords: cytokinin
panicle removal
source–sink relationship
Issue Date: Jun-2006
Publisher: Blackwell
Journal Title: Soil Science and Plant Nutrition
Volume: 52
Issue: 3
Start Page: 331
End Page: 340
Publisher DOI: 10.1111/j.1747-0765.2006.00042.x
Abstract: To evaluate the role of cytokinin in the source–sink relationship, panicles of rice were cut from the stem at the panicle emergence stage. Xylem sap exudates were collected using the stem cut method and the cytokinin concentration in the collected sap was determined by bioassay and further analysis using enzyme-linked immunosorbent assay. The rate of cytokinin translocation from roots to shoots decreased continuously after panicle initiation, whereas, when the panicle was removed, the rate increased by up to 1.5-fold, at which time no cytokinin was found in the plants with panicles. Retardation of leaf senescence was not observed and nitrogen concentration in the leaves continued to decrease after panicle removal, irrespective of cytokinin (mainly dihydrozeatin riboside and trans-zeatin riboside) level. Thus, leaf autonomy is regulated by an endogenous program of nitrogen translocation from the leaf regardless of cytokinin level in the xylem.
Rights: The definitive version is available at
Type: article (author version)
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: 信濃 卓郎

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