Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 66, Issue 13, Pages 3657-3667Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erv105
Keywords
Cu; deficiency; ethylene; PSK; root elongation; TPST
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Funding
- JSPS [P11394]
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [25221202, 22119002]
- Grants-in-Aid for Scientific Research [26712008, 22128008, 15H05957] Funding Source: KAKEN
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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.
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