English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

P-HYDROXYPHENYLPYRUVATE DIOXYGENASE (HPPD)  is the first committed enzyme involved in the biosynthesis of vitamin E, and is characterized by catalyzing the conversion of p-hydroxyphenyl pyruvate (HPP) to homogentisic acid (HGA). Here, an  HPPD  gene was cloned from  Medicago sativa  L. and designated  MsHPPD , which was expressed at high levels in alfalfa leaves. PEG 6000 (polyethylene glycol), NaCl, abscisic acid and salicylic acid were shown to significantly induce  MsHPPD  expression, especially in the cotyledons and root tissues. Overexpression of  MsHPPD  was found to significantly increase the level of β-tocotrienol and the total vitamin E content in  Arabidopsis  seeds. Furthermore, these transgenic  Arabidopsis  seeds exhibited an accelerated germination time, compared with wild-type seeds under normal conditions, as well as under NaCl and ABA treatments. Meanwhile, the expression level of several genes associated with ABA biosynthesis ( NCED3, NCED5  and  NCED9 ) and the ABA signaling pathway ( RAB18, ABI3  and  ABI5 ) were significantly down-regulated in  MsHPPD- overexpressing transgenic lines, as well as the total free ABA content. Taken together, these results demonstrate that  MsHPPD  functions not only in the vitamin E biosynthetic pathway, but also plays a critical role in seed germination via affecting ABA biosynthesis and signaling.

P-HYDROXYPHENYLPYRUVATE DIOXYGENASE from Medicago sativa is involved in vitamin E biosynthesis and abscisic acid-mediated seed germination