Peptide encoding Populus CLV3/ESR-RELATED 47 (PttCLE47) promotes cambial development and secondary xylem formation in hybrid aspen

被引：21

作者：

Kucukoglu, Melis ^{[1
,2
,3
,4
]}

Chaabouni, Salma ^{[1
]}

Zheng, Bo ^{[5
,6
]}

Mahonen, Ari Pekka ^{[2
,3
,4
]}

Helariutta, Yka ^{[2
,3
,4
,7
]}

Nilsson, Ove ^{[1
]}

机构：

[1] Swedish Univ Agr Sci, Umea Plant Sci Ctr, Dept Forest Genet & Plant Physiol, S-90183 Umea, Sweden

[2] Univ Helsinki, Inst Biotechnol, Helsinki Inst Life Sci HILIFE, FIN-00014 Helsinki, Finland

[3] Univ Helsinki, Fac Biol & Environm Sci, Organismal & Evolutionary Biol Res Programme OEB, FIN-00014 Helsinki, Finland

[4] Univ Helsinki, Viikki Plant Sci Ctr, FIN-00014 Helsinki, Finland

[5] Huazhong Agr Univ, Key Lab Hort Plant Biol, Minist Educ, Wuhan 430070, Hubei, Peoples R China

[6] Huazhong Agr Univ, Coll Hort & Forestry Sci, Wuhan 430070, Hubei, Peoples R China

[7] Univ Cambridge, Sainsbury Lab, Cambridge CB2 1LR, England

来源：

NEW PHYTOLOGIST | 2020年 / 226卷 / 01期

基金：

芬兰科学院; 瑞典研究理事会;

关键词：

cambium; CLE peptides; Populus; PttCLE47; secondary growth and development; wood formation; STEM-CELL FATE; CLE PEPTIDES; GENE-EXPRESSION; WOOD FORMATION; HD-ZIP; ARABIDOPSIS; CLAVATA3; MERISTEM; SHOOT; CLV3;

D O I：

10.1111/nph.16331

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The CLAVATA3 (CLV3)/EMBRYO SURROUNDING REGION (ESR)-RELATED (CLE) peptide ligands in connection with their receptors are important players in cell-to-cell communications in plants. Here, we investigated the function of the Populus CLV3/ESR-RELATED 47 (PttCLE47) gene during secondary growth and wood formation in hybrid aspen (Populus tremula x tremuloides) using an RNA interference (RNAi) approach. Expression of PttCLE47 peaks in the vascular cambium. Silencing of the PttCLE47 gene expression affected lateral expansion of stems and decreased apical height growth and leaf size. In particular, PttCLE47 RNAi trees exhibited a narrower secondary xylem zone with less xylem cells/cell file. The reduced radial growth phenotype also correlated with a reduced number of cambial cell layers. In agreement with these results, expression of several cambial regulator genes was downregulated in the stems of the transgenic trees in comparison with controls. Altogether, these results suggest that the PttCLE47 gene is a major positive regulator of cambial activity in hybrid aspen, mainly promoting the production of secondary xylem. Furthermore, in contrast to previously characterized CLE genes expressed in the wood-forming zone, PttCLE47 appears to be active at its site of expression.

引用

页码：75 / 85

页数：11