Abstract:
:Ethylene is a gaseous hormone that affects many processes of plant growth and development. During vascular development, ethylene positively regulates cambial cell division in parallel with tracheary element differentiation inhibitory factor (TDIF) peptide signaling. In this study, we identified an ethylene overproducing mutant, acs7-d, exhibiting enhanced cambial activity and reduced wall development in fiber cells. Using genetic analysis, we found that ethylene signaling is necessary for the phenotypes of enhanced cambial cell division as well as defects in stem elongation and fiber cell wall development. Further, the cambial cell proliferation phenotype of acs7-d depends on WOX4, indicating that the two parallel pathways, ethylene and TDIF signaling, converge at WOX4 in regulating cambium activity. Gene expression analysis showed that ethylene impedes fiber cell wall biosynthesis through a conserved hierarchical transcriptional regulation. These results advance our understanding of the molecular mechanisms of ethylene in regulating vascular meristem activity.
journal_name
J Exp Botjournal_title
Journal of experimental botanyauthors
Yang S,Wang S,Li S,Du Q,Qi L,Wang W,Chen J,Wang Hdoi
10.1093/jxb/eraa423subject
Has Abstractpub_date
2020-12-31 00:00:00pages
7160-7170issue
22eissn
0022-0957issn
1460-2431pii
5905237journal_volume
71pub_type
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