ACC-induced alkaloid alkalization plays an important role in Arabidopsis cell elongation
The expansion and elongation of plant cells requires acidification of the apoplast. The theory of acid growth suggests that protons act as the initial cell wall relaxation factor to cause cell expansion. Studies have shown that the low pH of apoplasts increases the activity of expandin in the cell wall, which may break the H + -bound cellulose chain and cross-linked polysaccharides. . The pH of the apoplast is determined by the H + outflow caused by PM H + -ATPase and the H + influx caused by the H + binding transporter. Hormone signals such as auxin and environmental factors affect the growth of cells by pH changes caused by PM H + -ATPase.
In early 2011, Belgian scientist Kris Vissenberg et al. used non-invasive micro-test techniques to study the two ends of the Arabidopsis thaliana root elongation zone: the transition zone and the posterior meristem zone (about 200-450 Î¼m from the root tip). The former elongates slowly, the latter elongates rapidly, and the adjacent regions (from 450 Î¼m to the first root hair region) elongate rapidly. It was found that the pH of the surface of the tip portion of the transition zone is the highest, and the base of the rapid elongation zone is the lowest. ACC treatment inhibits rapid elongation of the cells, accompanied by alkalization of the apoplast. C. cerevisiae (FC, an activator of PM H + -ATPase) partially reduces cell elongation induced by alkaloid alkalization, but the inhibitor DCCD (dicyclohexylcarbodiimide) does not Reduce the length of the largest cells. The H + flow rate of auxin mutants was determined by non-invasive micro-test technique. Finally, it is believed that the influence of PM and auxin on PM H + -ATPases activity is a mechanism that affects the final elongation of root cells.
This study demonstrates that ACC works by affecting the auxin content of specific cells and establishes a regulatory model in which ACC alters auxin synthesis and transport, leading to an increase in auxin and then negatively regulating H + -ATPase activity, resulting in Changes in cell elongation.
Key words: PM H+-ATPase; non-invasive micro-measurement technique (MIFE); ACC; auxin (Auxin); H+ flow rate; FC (chisporin)
Read the full text: ACC-induced alkaloid alkalization plays an important role in the elongation of Arabidopsis cells. Apoplastic alkalinisation is instrumental for the inhibition of cell elongation in the Arabidopsis thaliana root by the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) )
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