Morphological and hormonal diversity in rose (Rosa hybrida L.) and potato (Solanum tuberosum L.) Ri genotypes: A comparative study.
Rüter P, Thomsen T, Tyburski J, Waligórski P, Surówka E
Crop Improvement
PubMedRoses and potatoes bred with this bacterial trick could be made more compact, root more easily from cuttings, and potentially be more resilient — meaning hardier garden roses and more productive potato crops without traditional heavy pesticide or fertilizer regimens.
Researchers used a naturally occurring soil bacterium to insert extra DNA into roses and potatoes, which caused the plants to grow shorter, develop more roots, and produce different levels of plant hormones. Both plants ended up more compact and root-friendly, but each species responded differently at the hormonal level, showing that the same genetic tweak doesn't work identically in every plant. This knowledge could help breeders create plants that are naturally bushier, easier to propagate, and better suited to specific growing conditions.
Key Findings
Ri-modified plants consistently grew shorter internodes (50–89% of normal length) and showed up to 2.34× greater root formation compared to unmodified plants.
Cytokinin hormone levels were consistently higher across both rose and potato Ri genotypes, but stress-related hormone responses were species-specific rather than universal.
Contrary to expectations, Ri plants did not show a 'hairy root' appearance, but did have measurably thicker root tips (6–23% larger diameter than wild-type plants).
chevron_right Technical Summary
Scientists used a soil bacterium to genetically modify roses and potatoes, then studied how the modifications changed plant shape, root growth, and hormone levels. The results reveal that while both plants grew more compact with better rooting ability, the hormonal responses were surprisingly species-specific.
Abstract Preview
Ri (root-inducing) technology, mediated by Rhizobium rhizogenes, presents a promising approach for modifying plant architecture. However, a comprehensive understanding of how complete, integrated w...
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