MISC

2006年

Developmental changes of plant affecting primary photosynthate distribution in rice leaves

PHOTOSYNTHETICA
  • T. Shinano
  • ,
  • K. Ando
  • ,
  • K. Okazaki
  • ,
  • M. Osaki

44
4
開始ページ
591
終了ページ
598
記述言語
英語
掲載種別
DOI
10.1007/s11099-006-0076-8
出版者・発行元
SPRINGER

Developmental changes of plant in the regulation of photosynthate distribution of leaves were studied in hydroponically cultivated rice by the (CO2)-C-14 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 5(th) leaf than in the 6(th) one. Correspondingly, the V-max of PEPC was significantly higher in the 5(th) than in the 6(th) 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 5(th) than in the 6(th) leaf. As the 5(th) leaf develops before panicle initiation in rice, it predominantly supports vegetative growth, while the 6(th) 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 6(th) leaf became fully expanded (corresponding to the panicle initiation stage of plant), the distribution pattern of C-14 was transiently changed in the 5(th) 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.

Web of Science ® 被引用回数 : 4

リンク情報
DOI
https://doi.org/10.1007/s11099-006-0076-8
CiNii Articles
http://ci.nii.ac.jp/naid/120000971008
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000242885600013&DestApp=WOS_CPL