Original title: Cytokinins Promote Rust Susceptibility in Poplar by Suppressing Defence Signalling, Reducing Defence Accumulation and Reprogramming Primary Metabolism
CytokininsPlant chemical signals that help regulate growth and can also affect responses to infection. are plant signals best known for helping control growth. During rust infection, several kinds of cytokinin rise in poplar leaves, and applying them makes the fungus colonise the leaves more. The added cytokinins reduce antifungal chemicals and defence-related hormones, while increasing free amino acids, which may provide more nutrients for the fungus. The results suggest these signals can make poplar less able to resist rust.
Imagine guarding a kitchen while a hungry guest is trying to get in. The door is harder to guard when you put away some of your protective supplies and leave more food within reach. In this paper, the guest is the rust fungus, the supplies are the tree's chemical defences, and the extra food is the amino acids that build up when cytokinin levels rise.
Rust fungi can damage trees, and this work suggests that plant growth signals may also weaken the chemical defences that help trees resist infection. Understanding that trade-off could help researchers investigate how poplar trees respond to disease.
The abstract reports results for black poplar infected by one rust fungus and describes experiments applying cytokinins. It does not establish how these effects work in other trees or infections, whether the amino acids directly feed the fungus, or how the findings might be used to protect trees.
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Cytokinins Promote Rust Susceptibility in Poplar by Suppressing Defence Signalling, Reducing Defence Accumulation and Reprogramming Primary Metabolism — Chhana Ullah, Ahalya Rajendran, Sarrin Shahadat et al. — Plant Cell & Environment — doi:10.1111/pce.70953
Abstract licence: CC BY
Explanation generated by Synthesis from the abstract — it is not the original paper.