Sucrose metabolism in plastids

被引:55
作者
Gerrits, N
Turk, SCHJ
van Dun, KPM
Hulleman, SHD
Visser, RGF
Weisbeek, PJ
Smeekens, SCM
机构
[1] Univ Utrecht, Dept Mol Plant Physiol, NL-3584 CH Utrecht, Netherlands
[2] Univ Utrecht, Dept Mol Cell Biol, NL-3584 CH Utrecht, Netherlands
[3] Advanta Seeds, NL-4410 AA Rilland, Netherlands
[4] DLO, Agrotechnol Res Inst, NL-6700 AA Wageningen, Netherlands
[5] Univ Wageningen & Res Ctr, Lab Plant Breeding, NL-6700 AJ Wageningen, Netherlands
关键词
D O I
10.1104/pp.125.2.926
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The question whether sucrose (Suc) is present inside plastids has been long debated. Low Suc levels were reported to be present inside isolated chloroplasts, but these were argued to be artifacts of the isolation procedures used. We have introduced Sue-metabolizing enzymes in plastids and our experiments suggest substantial Suc entry into plastids. The enzyme levansucrase from Bacillus subtilis efficiently synthesizes fructan from Sue. Targeting of this enzyme to the plastids of tobacco (Nicotiana tabacum) and potato (Solanum tuberosum) plants leads to high-level fructan accumulation in chloroplasts and amyloplasts, respectively. Moreover, introduction of this enzyme in amyloplasts leads to an altered starch structure. Expression of the yeast invertase in potato tuber amyloplasts results in an 80% reduction of total Suc content, showing efficient hydrolysis of Suc by the plastidic invertase. These observations suggest that Suc can enter plastids efficiently and they raise questions as to its function and metabolism in this organelle.
引用
收藏
页码:926 / 934
页数:9
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