期刊
NEW PHYTOLOGIST
卷 229, 期 1, 页码 186-198出版社
WILEY
DOI: 10.1111/nph.16721
关键词
C-13 labelling; aspen; biomass; carbon allocation; Populus; sucrose synthase
资金
- Bio4Energy (Swedish Programme for Renewable Energy)
- Umea Plant Science Centre
- Swedish Research Council for Sustainable Development (Formas)
- Bio4Energy
- SSF project ValueTree
- Berzelii Centre for Forest Biotechnology - Vinnova
The study reveals the significant impact of SUS on C metabolism and biomass formation in entire trees, confirming its regulatory role in C flow in different tissues and highlighting its importance in wood development.
Despite the ecological and industrial importance of biomass accumulation in wood, the control of carbon (C) allocation to this tissue and to other tree tissues remain poorly understood. We studied sucrose synthase (SUS) to clarify its role in biomass formation and C metabolism at the whole tree level in hybrid aspen (Populus tremula x tremuloides). To this end, we analysed source leaves, phloem, developing wood, and roots ofSUSRNAitrees using a combination of metabolite profiling,(13)CO(2)pulse labelling experiments, and long-term field experiments. The glasshouse grownSUSRNAitrees exhibited a mild stem phenotype together with a reduction in wood total C. The(13)CO(2)pulse labelling experiments showed an alteration in the C flow in all the analysed tissues, indicating that SUS affects C metabolism at the whole tree level. This was confirmed when theSUSRNAitrees were grown in the field over a 5-yr period; their stem height, diameter and biomass were substantially reduced. These results establish that SUS influences C allocation to developing wood, and that it affects C metabolism at the whole tree level.
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