Developmental regulation of photosynthate distribution in leaves of rice

SHINANO, TAKURO; NAKAJIMA, KANTO; WASAKI, JUN; MORI, HARUHIDE; ZHENG, TEI; OSAKI, MITSURU

Developmental regulation of photosynthate distribution in leaves of rice

SHINANO, TAKURO; NAKAJIMA, KANTO; WASAKI, JUN et al.

Photosynthetica, 2006, 44(1), 1-10

Permalink : https://hdl.handle.net/2115/946

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アクセス権	open access
URI	https://hdl.handle.net/2115/946
タイトル	Developmental regulation of photosynthate distribution in leaves of rice
著者	SHINANO, TAKURO ; NAKAJIMA, KANTO ; WASAKI, JUN ; MORI, HARUHIDE ; ZHENG, TEI ; OSAKI, MITSURU
著者名 SHINANO, TAKURO 信濃, 卓郎
著者名 NAKAJIMA, KANTO
著者名 WASAKI, JUN
著者名 MORI, HARUHIDE
著者名 ZHENG, TEI
e-Rad_Researcher 60168903 著者名 OSAKI, MITSURU
言語	英語
キーワード	glutamine synthetases
	leaf development
	mRNA expression
	Oryza
	phosphoenolpyruvate carboxylase
	pyruvate kinase
	ribulose-1,5-bisphosphate
	carboxylase/oxygenase
	sucrose phosphate synthase
発行日	2006
出版者	Springer Netherlands
収録物名	Photosynthetica
巻(号)	44(1)
ページ	1-10
抄録	mRNA expression patterns of genes for metabolic key enzymes sucrose phosphate synthase (SPS), phosphoenolpyruvate carboxylase (PEPC), pyruvate kinase, ribulose 1,5-bisphosphate carboxylase/oxygenase, glutamine synthetase 1, and glutamine synthetase 2 were investigated in leaves of rice plants grown at two nitrogen (N) supplies (N0.5, N3.0). The relative gene expression patterns were similar in all leaves except for 9th leaf, in which mRNA levels were generally depressed. Though increased N supply prolonged the expression period of each mRNA, it did not affect the relative expression intensity of any mRNA in a given leaf. SPS Vmax, SPS limiting and PEPC activities, and carbon flow were examined. The ratio between PEPC activity and SPS Vmax was higher in leaves developed at the vegetative growth stage (vegetative leaves: 5th and 7th leaves) than in leaves developed after the ear primordia formation stage (reproductive leaves: 9th and flag leaves). PEPC activity and SPS Vmax decreased with declining leaf N content. After using 14CO2 the 14C photosynthate distribution in the amino acid fraction was higher in vegetative than in reproductive leaves when compared for the same leaf N status. Thus, at high PEPC/SPS activities ratio, more 14C photosynthate was distributed to the amino acid pool, whereas at higher SPS activity more 14C was channelled into the saccharide fraction. Thus, leaf ontogeny was an important factor controlling photosynthate distribution to the N- or C-pool, respectively, regardless of the leaf N status.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	The original publication is available at www.springerlink.com
PISSN	0300-3604
EISSN	1573-9058
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1007/s11099-005-0151-6