What is it about?
Despite a general view that asparagine synthetase generates asparagine for long-distance transport of nitrogen to sink organs, transcript and metabolite profiles of siliques and floral organs assign the asparagine synthesis for its use to the developing embryos.
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Why is it important?
The post-phloem synthesis and transport of asparagine in seed nitrogen filling is unravelled by the induction of asparagine metabolic pathways triggered by pollination in reproduction organs where (i) ASN1-encoded asparagine synthetase is localised for the first time in the vascular cells of the silique cell wall and septum but also in the outer and inner seed integuments and that (ii) a several-fold increase in free asparagine n the ovary of the promoterCaMV35S::ASN1 lines is correlated to enhanced seed nitrogen, whereas the delayed asparagine accumulation at the desiccation stage of the promoterNapin2S::ASN1 lines results in wild-type seed nitrogen.
Perspectives
In the seed nitrogen filling, transcript and metabolite profiles in floral organs match the carbon and nitrogen partitioning to generate energy via the TCA cycle, GABA shunt and phosphorylated serine synthetic pathway.
Suzuki Akira
Read the Original
This page is a summary of: ASN1-encoded asparagine synthetase in floral organs contributes to nitrogen filling in Arabidopsis seeds, The Plant Journal, May 2017, Wiley,
DOI: 10.1111/tpj.13567.
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