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Comparative studies on the photosynthesis of higher plants, 4. Further studies on the photosynthetic sugar formation pathway in C/sub 4/-plants

Journal Article:

Abstract

In this paper, studies were carried out to confirm whether carbon atoms except C-4 of C/sub 4/-compounds were involved in the photosynthetic sugar formation in C/sub 4/ plants. In feeding of uniformly-labeled malate to maize leaves, sugar formation under aerobic conditions was 3 times as large as that under anaerobic conditions. There was no detectable difference in the amount of activity in the sugar formed from ..beta..-carboxyl-labeled malate between aerobic and anaerobic conditions; however. Under anaerobic conditions, sugar was formed from alanine-1-/sup 14/C in maize but not in rice leaves. Sugar formation of this case might have occurred by the direct conversion of pyruvate to sugar via PEP and PGA. From these results, we assume that the following three pathways function cooperatively in the photosynthetic sugar formation in C/sub 4/-plants. 1) One carbon atom at number 4 in C/sub 4/-dicarboxylic acid is transferred to RuDP, resulting in the formation of PGA and this is metabolized into sugar. 2) After transferring C-4 of C/sub 4/-dicarboxylic acid, the remaining C/sub 3/-compound is introduced into the TCA cycle and completely degradated there, and thus-produced CO/sub 2/ is refixed by PEP carboxylase in the mesophyll and metabolized into sugar the same pathway as in  More>>
Authors:
Imai, H; [1]  Iwai, Sumio; Yamada, Yoshio
  1. National Inst. of Agricultural Sciences, Tokyo (Japan)
Publication Date:
Mar 01, 1975
Product Type:
Journal Article
Reference Number:
AIX-07-244471; EDB-76-076782
Resource Relation:
Journal Name: Soil Sci. Plant Nutr. (Tokyo); (Japan); Journal Volume: 21:1
Subject:
59 BASIC BIOLOGICAL SCIENCES; PHOTOSYNTHESIS; CARBON 14 COMPOUNDS; LEAVES; MAIZE; RICE; SACCHAROSE; TRACER TECHNIQUES; BIOMASS; CARBOHYDRATES; CEREALS; CHEMICAL REACTIONS; DISACCHARIDES; ENERGY SOURCES; GRAMINEAE; GRASS; ISOTOPE APPLICATIONS; LABELLED COMPOUNDS; OLIGOSACCHARIDES; ORGANIC COMPOUNDS; PHOTOCHEMICAL REACTIONS; PLANTS; RENEWABLE ENERGY SOURCES; SACCHARIDES; SYNTHESIS; 551001* - Physiological Systems- Tracer Techniques
OSTI ID:
7358372
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: SSPNA
Submitting Site:
INIS
Size:
Pages: 13-19
Announcement Date:
Jul 01, 1976

Journal Article:

Citation Formats

Imai, H, Iwai, Sumio, and Yamada, Yoshio. Comparative studies on the photosynthesis of higher plants, 4. Further studies on the photosynthetic sugar formation pathway in C/sub 4/-plants. Japan: N. p., 1975. Web.
Imai, H, Iwai, Sumio, & Yamada, Yoshio. Comparative studies on the photosynthesis of higher plants, 4. Further studies on the photosynthetic sugar formation pathway in C/sub 4/-plants. Japan.
Imai, H, Iwai, Sumio, and Yamada, Yoshio. 1975. "Comparative studies on the photosynthesis of higher plants, 4. Further studies on the photosynthetic sugar formation pathway in C/sub 4/-plants." Japan.
@misc{etde_7358372,
title = {Comparative studies on the photosynthesis of higher plants, 4. Further studies on the photosynthetic sugar formation pathway in C/sub 4/-plants}
author = {Imai, H, Iwai, Sumio, and Yamada, Yoshio}
abstractNote = {In this paper, studies were carried out to confirm whether carbon atoms except C-4 of C/sub 4/-compounds were involved in the photosynthetic sugar formation in C/sub 4/ plants. In feeding of uniformly-labeled malate to maize leaves, sugar formation under aerobic conditions was 3 times as large as that under anaerobic conditions. There was no detectable difference in the amount of activity in the sugar formed from ..beta..-carboxyl-labeled malate between aerobic and anaerobic conditions; however. Under anaerobic conditions, sugar was formed from alanine-1-/sup 14/C in maize but not in rice leaves. Sugar formation of this case might have occurred by the direct conversion of pyruvate to sugar via PEP and PGA. From these results, we assume that the following three pathways function cooperatively in the photosynthetic sugar formation in C/sub 4/-plants. 1) One carbon atom at number 4 in C/sub 4/-dicarboxylic acid is transferred to RuDP, resulting in the formation of PGA and this is metabolized into sugar. 2) After transferring C-4 of C/sub 4/-dicarboxylic acid, the remaining C/sub 3/-compound is introduced into the TCA cycle and completely degradated there, and thus-produced CO/sub 2/ is refixed by PEP carboxylase in the mesophyll and metabolized into sugar the same pathway as in atmospheric CO/sub 2/ fixation. 3) The remaining C/sub 3/-compound is directly converted to PEP and then to sugar via PGA.}
journal = {Soil Sci. Plant Nutr. (Tokyo); (Japan)}
volume = {21:1}
journal type = {AC}
place = {Japan}
year = {1975}
month = {Mar}
}