@Article{phyton.2020.011882,
AUTHOR = {Liangliang Yu, Wenjun Zhou, Danping Zhang, Junhui Yan, Li Luo},
TITLE = {Phytosulfokine-α Promotes Root Growth by Repressing Expression of <i>Pectin Methylesterase Inhibitor</i> (<i>PMEI</i>) Genes in <i>Medicago truncatula</i>},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {89},
YEAR = {2020},
NUMBER = {4},
PAGES = {873--881},
URL = {http://www.techscience.com/phyton/v89n4/40524},
ISSN = {1851-5657},
ABSTRACT = {Phytosulfokine-α (PSK-α), a sulfated pentapeptide with the sequence
YIYTQ, is encoded by a small precursor gene family in Arabidopsis. PSK-α regulates multiple growth and developmental processes as a novel peptide hormone.
Despite its importance, functions of PSK-α in <i>M. truncatula</i> growth remains
unknown. In this study, we identified five genes to encode PSK-α precursors in
<i>M. truncatula</i>. All of these precursors possess conserved PSK-α signature motif.
Expression pattern analysis of these <i>MtPSK</i> genes revealed that each gene was
expressed in a tissue-specific or ubiquitous pattern and three of them were remarkably expressed in root. Treatment of <i>M. truncatula</i> seedlings with synthetic PSK-
α peptide significantly promoted root elongation. In addition, expression analysis
of downstream genes by RNA-seq and qRT-PCR assays suggested that PSK-α
signaling might regulate cell wall structure via PMEI-PME module to promote
root cell growth. Taken together, our results shed light on the mechanism by
which PSK-α promotes root growth in <i>M. truncatula</i>, providing a new resource
for improvement of root growth in agriculture.},
DOI = {10.32604/phyton.2020.011882}
}