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Phosphorus Enhances Photosynthetic Storage Starch Production in a Green Microalga (Chlorophyta) Tetraselmis subcordiformis in Nitrogen Starvation Conditions
journal contribution
posted on 2018-10-01, 00:00 authored by Changhong Yao, Junpeng Jiang, Xupeng Cao, Yinghui Liu, Song Xue, Yongkui ZhangMicroalgae
are potential starch producers as alternatives to agricultural crops.
This study disclosed the effects and mechanism of phosphorus availability
exerted on storage starch production in a starch-producing microalga Tetraselmis subcordiformis in nitrogen starvation conditions.
Excessive phosphorus supply facilitated starch production, which differed
from the conventional cognition that phosphorus would inhibit transitory
starch biosynthesis in plants. Phosphorus enhanced energy utilization
efficiency for biomass and storage starch production. ADP-glucose
pyrophosphorylase (AGPase), conventionally known to be critical for
starch biosynthesis, was negatively correlated to storage starch biosynthesis.
Excessive phosphorus supply maintained large cell volumes, enhanced
activities of starch phosphorylases (SPs) along with branching enzymes
and isoamylases, and increased phosphoenolpyruvate and trehalose-6-phosphate
levels to alleviate the inhibition of high phosphate availability
to AGPase, all of which improved starch production. This work highlighted
the importance of phosphorus in the production of microalgal starch
and provided further evidence for the SP-based storage starch biosynthesis
pathway.
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starch biosynthesisSP-based storage starch biosynthesis pathwaytrehalose -6-phosphate levelsNitrogen Starvation Conditions Microalgaestorage starch biosynthesisnitrogen starvation conditionsstorage starch productionstarch productionenergy utilization efficiencyExcessive phosphorus supplystarch-producing microalga Tetraselmis subcordiformisPhosphorus Enhances Photosynthetic Storage Starch Production
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