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  • Integrated analysis of transcriptome and metabolites reveals an essential role of metabolic flux in starch accumulation under nitrogen starvation in duckweed.

Integrated analysis of transcriptome and metabolites reveals an essential role of metabolic flux in starch accumulation under nitrogen starvation in duckweed.

Biotechnology for biofuels (2017-07-04)
Changjiang Yu, Xiaowen Zhao, Guang Qi, Zetao Bai, Yu Wang, Shumin Wang, Yubin Ma, Qian Liu, Ruibo Hu, Gongke Zhou
ABSTRACT

Duckweed is considered a promising source of energy due to its high starch content and rapid growth rate. Starch accumulation in duckweed involves complex processes that depend on the balanced expression of genes controlled by various environmental and endogenous factors. Previous studies showed that nitrogen starvation induces a global stress response and results in the accumulation of starch in duckweed. However, relatively little is known about the mechanisms underlying the regulation of starch accumulation under conditions of nitrogen starvation. In this study, we used next-generation sequencing technology to examine the transcriptome responses of Based on these results, it can be concluded that the increase of ADP-glucose and starch contents under nitrogen starvation is a consequence of increased output from the gluconeogenesis and TCA pathways, accompanied with the reduction of lipids and pectin biosynthesis. The results provide novel insights into the underlying mechanisms of starch accumulation during nitrogen starvation, which provide a foundation for the improvement of advanced bioethanol production in duckweed.

MATERIALS
Product Number
Brand
Product Description

Supelco
α-Amylase from Bacillus licheniformis, suitable for determination of starch (Kit STA-20)
Sigma-Aldrich
Amyloglucosidase from Aspergillus niger, ≥260 U/mL, aqueous solution