Cytokinin and Nitrogen-Mediated Gene Regulation for $C_4$ Photosynthesis

Sugiyama, Tatsuo; Takei, Kentaroch; Deji, Atsushi; Tanguichi, Mitsutaka; Sakakibara, Hitoshi

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자료유형: 학술대회자료

저자정보: Sugiyama, Tatsuo (Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University) Takei, Kentaroch (Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University) Deji, Atsushi (Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University) Tanguichi, Mitsutaka (Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University) Sakakibara, Hitoshi (Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University)

저널정보: 한국식물학회 한국식물학회 심포지움 한국식물학회 1996년도 식물학심포지움 식물호르몬과 신호전달

발행연도: 1996.1

수록면: 50 - 63 (14page)

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Nitrogen (N) is an important regulator of the expression of genes involved in carbon and N assimilation pathways in plants by selectively altering the levels of proteins and/or mRNAs. These in C4 plants include genes for such as phosphoenolpyruvate carboxylase, carbonic anhydrase, and pyruvate-Pi dikinase. The C4 genes are regulated in mesophyll cells by N availability both transcriptionally and posttranscriptionally through cytokinins and glutamine as signals. The level of both the signals is up-regulated by N availability: cytokinins in roots and glutamine in leaves. The level of glutamine is controlled by the differential expression by N of glutamine synthetase and ferrdoxin-dependent glutamate synthase genes which locate in the mesophyll cells of C4 plants. The results is discussed as molecular mechanism for the greater N use efficiency of the plants as well as N partitioning is the photosynthetic cells.

#N, nitrogen #PEPC #phosphoenolpyruvate carboxylase #PPDK #pyruvate orthophosphate dikinase #Rubisco #ribulose 1,5-bisphosphate carboxylase/oxygenase #GS #glutamine synthetase #AlaAT #alanine aminotransferase #AspA T #aspartate aminotransferase #Fd-GOGAT #ferredoxin-dependent glutamate #MS X #methionine sulfoximine #CA #carbonic anhydrase

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