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Developmental changes of plant affecting primary photosynthate distribution in rice leaves

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Title: Developmental changes of plant affecting primary photosynthate distribution in rice leaves
Authors: Shinano, T. Browse this author
Ando, K. Browse this author
Okazaki, K. Browse this author
Osaki, M. Browse this author →KAKEN DB
Keywords: 14CO2
leaf position
Oryza sativa
phosphoenolpyruvate carboxylase
primary photosynthate
pyruvate kinase
sucrose phosphate synthase
Issue Date: 2006
Publisher: Springer Netherlands
Journal Title: Photosynthetica
Volume: 44
Issue: 4
Start Page: 591
End Page: 598
Publisher DOI: 10.1007/s11099-006-0076-8
Abstract: Developmental changes of plant in the regulation of photosynthate distribution of leaves were studied in hydroponically cultivated rice by the 14CO2 tracer technique and analysis of the activity of the regulatory enzymes, sucrose phosphate synthase (SPS), phosphoenolpyruvate carboxylase (PEPC), and pyruvate kinase (PK). The distribution of primary photosynthates into sugars, amino acids, organic acids, sugar phosphates, proteins, and polysaccharides was determined by column chromatography. The relative primary photosynthate distribution to the sugar phosphate fraction was significantly larger in the 5th leaf than in the 6th one. Correspondingly, the Vmax of PEPC was significantly higher in the 5th than in the 6th leaf, while no significant differences between leaves were detected in the other enzymes. As a consequence, the ratio of the Vmax of SPS and PEPC was lower in the 5th than in the 6th leaf. As the 5th leaf develops before panicle initiation in rice, it predominantly supports vegetative growth, while the 6th leaf develops after panicle initiation and thus contributes mainly to reproductive growth. We conclude that the physiological properties of each leaf are regulated developmentally. When the 6th leaf became fully expanded (corresponding to the panicle initiation stage of plant), the distribution pattern of 14C was transiently changed in the 5th leaf, indicating that individual organs that are mainly involved in vegetative development are affected to some extent by the whole-plant-level physiological transformation that occurs at the transition from the vegetative to the reproductive stage.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 信濃 卓郎

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