Scientists map a hormone roadmap for smarter tree breeding
Ma Z, Li W, Guo Q, Tibesigwa DG, Meng Q
Plant Signaling
The reason a maple in your yard sends up multiple trunks instead of one straight one, or why a stressed tree suddenly sprouts side branches, traces back to this same hormone signal researchers now want to fine-tune in forestry.
Strigolactones are chemical signals plants make that tell buds whether to grow into new branches, help roots form partnerships with helpful fungi, and help plants cope with drought and other stress. This paper reviews everything scientists know about how these signals work in trees and lays out a step-by-step plan, from lab experiments to years-long field trials, for using that knowledge to breed trees with better shape, growth, and resilience. It also weighs the risks and rules around using gene editing, grafting, and lab-made versions of these hormones in real forests.
Key Findings
Reviews strigolactone biosynthesis, signaling, and long-distance transport within trees, and how they interact with auxin, cytokinin, and abscisic acid
Proposes a staged research-to-breeding roadmap: molecular validation, then medium/short-term testing in model trees, then multisite long-term ecological field assessment
Recommends specific tools (LC-MS/MS, isotope labeling, tissue-specific CRISPR, inducible expression, grafting assays) alongside risk and regulatory guidance for chemical analogs and gene editing in forestry
chevron_right Technical Summary
This review pulls together decades of research on strigolactones, plant hormones that control branching and root growth, into a roadmap for breeding better forest trees. The goal is trees that branch less, resist stress more, and grow into higher-quality timber.
Abstract Preview
Original paper
Strigolactones: From Fundamental Biology to Applications in Tree Breeding.
Strigolactones (SLs) are small carotenoid-derived signaling molecules that serve as both rhizosphere chemical cues and well-recognized endogenous plant hormones. They are involved in shoot branchin...
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