Transcriptomic changes in donor soybean, dodder bridge, and the connected recipient soybean induced by cadmium...

Area of Science:

• Plant Biology
• Environmental Science
• Genomics

Background:

• Cuscuta spp. (dodders) are parasitic plants forming dodder bridges between hosts.
• Cadmium (Cd²⁺) is a heavy metal impacting plant growth.
• The effect of Cd²⁺ on plants via dodder bridges was previously unknown.

Purpose of the Study:

• To investigate Cd²⁺ effects on donor and recipient plants linked by dodder bridges.
• To analyze transcriptomic changes induced by Cd²⁺ exposure.
• To understand signal transduction mechanisms in plants connected by dodder bridges under stress.

Main Methods:

• Pot experiment with Cd²⁺ treatment.
• Transcriptome analysis of donor and recipient plants.
• Analysis of gene expression related to specific pathways.

Main Results:

• Cd²⁺ significantly altered gene expression in 'Plant-pathogen interaction', 'phenylpropanoid biosynthesis', and 'isoflavonoid biosynthesis' pathways.
• Cd²⁺ indirectly induced changes in dodder bridges, affecting oxidation-reduction and Ca²⁺ signaling.
• mRNA transfer from soybean to dodder was observed, suggesting a role in signal transduction.

Conclusions:

• Cd²⁺ directly and indirectly induces transcriptomic changes in connected plants.
• Dodder bridges mediate stress responses between plants.
• mRNA, Ca²⁺, and ROS are crucial in Cd²⁺ stress signal transduction.