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• W3141893462 abstract "Abstract Tyrosine-sulfated peptides are key regulators of plant growth and development. The disulfated pentapeptide phytosulfokine (PSK) mediates growth via leucine-rich repeat receptor-like kinases, PSKR1 and PSKR2. PSKRs are part of a response module at the plasma membrane that mediates short-term growth responses, but downstream signaling of transcriptional regulation remains unexplored. In Arabidopsis, tyrosine sulfation is catalyzed by a single-copy gene ( TPST ). We performed a microarray-based transcriptome analysis in the tpst-1 mutant background that lacks sulfated peptides to identify PSK-regulated genes and genes that are regulated by other sulfated peptides. Of the 160 PSK-regulated genes, several had functions in root growth and development in agreement with shorter roots and a higher lateral root density in tpst-1 . Further, tpst-1 roots developed higher numbers of root hairs and PSK induced expression of WEREWOLF (WER) , its paralog MYB DOMAIN PROTEIN 23 (MYB23) and At1g66800 that maintain non-hair cell fate. The tpst-1 pskr1-3 pskr2-1 mutant showed even shorter roots, and higher lateral root and root hair density than tpst-1 revealing unexpected synergistic effects of ligand and PSK receptor deficiencies. While residual activities may exist, overexpression of PSKR1 in the tpst-1 background induced root growth suggesting that PSKR1 may be active in the absence of sulfated ligands. Highlight Phytosulfokine (PSK) receptor signaling promotes root elongation, determines lateral root density and maintains non-hair cell fate partially independent of TPST responsible for the activating sulfation of PSK." @default.
• W3141893462 created "2021-04-13" @default.
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• W3141893462 date "2021-03-28" @default.
• W3141893462 modified "2023-09-23" @default.
• W3141893462 title "TPST-dependent and -independent regulation of root development and signaling by PSK LRR receptor kinases in Arabidopsis" @default.
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• W3141893462 doi "https://doi.org/10.1101/2021.03.26.437140" @default.
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