The study reveals a new mechanism for phosphorus signal regulation of antholine biosynthetics

plants in the case of phosphorus deficiency will be through the phosphorus signal transductive path to regulate a series of physiological changes to deal with phosphorus stress, usually plant response to low phosphorus or phosphorus stress ideophylline is one of the ideolytes in the leaf, stem and other tissues to accumulate anthratin.
According to the report, the core transcription factor PHR1 of the phosphorus signaling pathway is involved in regulating antholin accumulation induced by phosphorus deficiency, but the presence of PHR1-specific P1BS shun-acting elements was not found in the initiator region of anthocylin synthesis gene, indicating that PHR1 is likely to indirectly regulate antholine biosynthetics. So far, whether the phosphorus signal directly regulates anthotin synthesis is pending.
recently, the research team of plant secondary metabolism of the Institute of Virology and Biotechnology of Zhejiang Academy of Agricultural Sciences published a research paper online in New Botanists, revealing a new mechanism for phosphorus signals to regulate anthophyl biosynthesis.
study found that the negative regulatory factor SPX4 of phosphorus signal and the MYB transcription factor PAP1, which controls anthocyte biosynthetics, were mutually regulated antholin synthesis. Under normal growth conditions, SPX4 binds and inhibits PAP1 transcription activity, however, under phosphorus deficiency conditions, spX4 and PAP1 binding weakens, free PAP1 can regulate the transcriptional expression of the key enzyme DFR in the anthocytin synthesis process, and eventually lead to anthotin accumulation.
the results reveal the molecular mechanisms of plant nutrition (phosphorus signals) that directly regulate the biosynthetics of secondary metabolism (anthophyl). At the same time, this (at least partially non-dependent) regulatory model, which does not depend on PHR1, also provides new ideas for molecular improvement of crops and the strategy of phosphate fertilizer application. (Source: Wang Fang, China Science Journal)
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