Related Experiment Video
Updated: Aug 5, 2026

A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response
Published on: April 17, 2016
PagIPT5 Mediates Cambial Development in Poplar via Cytokinin-Auxin Crosstalk
Yuhan Chen1, Xiaoxue Hong1, Jianyu Gu1
1National Key Laboratory for Development and Utilization of Forest Food Resources, Plant Cell Wall Research Centre, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, China.
Background/Objectives:
Cytokinin and auxin are essential for vascular development in plants. This study aims to explore whether these two hormones exhibit crosstalk in the cambium, analogous to that observed in the apical meristem.
Methods:
Using the hybrid poplar (Populus alba × P. glandulosa clone '84K'), we integrated gravitropic induction with transcriptomic analysis and identified the cytokinin biosynthesis gene PagIPT5 as differentially expressed in a tension wood induction system. PagIPT5 overexpression lines were generated and assessed for growth-related phenotypes. The interaction between cytokinin and auxin was investigated via anatomical observation, cell proliferation assays, in situ PCR, and immunofluorescence detection of auxin and cytokinin.
Results:
Compared with the wild type, PagIPT5 overexpression lines showed growth inhibition and an auxin-deficient phenotype. High PagIPT5 expression in the vascular cambium elevated cytokinin levels while reducing auxin levels, leading to decreased cambial cell proliferation and suppressed xylem development. However, in the tension wood induction system, both auxin and cytokinin levels increased in the vascular cambium of tension wood relative to opposite wood. Treatment with a superoxide anion activator promotes the accumulation of both auxin and cytokinin in 84K plants.
Conclusions:
These results revealed an antagonistic interaction between the two hormones in the cambium zone. However, this antagonism is attenuated in tension wood, which may be induced by the accumulation of superoxide anion in tension wood.
More Related Videos
08:54Imaging Spatial Reorganization of a MAPK Signaling Pathway Using the Tobacco Transient Expression System
Published on: March 20, 2016
08:04Poplar Adventitious Roots Induced by Stem Canker Pathogens: An Experimental System for Studying Roots Biology and Light Response-Related Processes
Published on: October 11, 2024
Related Concept Videos
Primary and Secondary Growth in Roots and Shoots
Meristems and Plant Growth
Plant Hormones
Cell Signaling in Plants
Morphogenesis
C4 Pathway and CAM
C4 Pathway
The C4 pathway is used by plants such as...