Abstract
To increase our understanding of the adaptation for copper (Cu) deficiency, Arabidopsis mutants with apparent alterations under Cu deficiency were identified. In this report, a novel mutant, tpst-2, was found to be more sensitive than wild-type (Col-0) plants to Cu deficiency during root elongation. The positional cloning of tpst-2 revealed that this gene encodes a tyrosylprotein sulfotransferase (TPST). Moreover, the ethylene production of tpst-2 mutant was higher than that of Col-0 under Cu deficiency, and adding the ethylene response inhibitor AgNO3 partially rescued defects in root elongation. Interestingly, peptide hormone phytosulfokine (PSK) treatment also repressed the ethylene production of tpst-2 mutant plants. Our results revealed that TPST suppressed ethylene production through the action of PSK.
Highlights
Cell-to-cell communication plays an important role in the response to developmental and environmental cues in multicellular organisms
Our results revealed that tyrosylprotein sulfotransferase (TPST) suppressed ethylene production through the action of PSK
The results obtained in this study reveal that TPST suppresses ethylene production through PSK action
Summary
Cell-to-cell communication plays an important role in the response to developmental and environmental cues in multicellular organisms. Secreted peptides [e.g., phytosulfokine (PSK), plant peptide containing sulfated tyrosine 1 (PSY1), and root growth factor] have recently emerged as a novel type of plant hormone (Matsubayashi and Sakagami, 1996; Matsubayashi, 2011, 2014; Yamada and Sawa, 2013). These peptides function as intercellular signalling molecules that coordinate and specify cellular functions in plants. TPSTs are located in the trans-Golgi network and distributed in various tissues and cells Several of these enzymes play important roles in inflammation, haemostasis, and immunity (Moore, 2003).
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