The improved auxin signalling via entire mutation enhances aluminium tolerance in tomato.
Silva RKG, Siqueira JA, Batista-Silva W, Silva MF, Wakin T
Plant Signaling
Roughly half the world's arable land is too acidic for many crops, and this research points toward tomatoes — and eventually other food plants — that could thrive in those soils without needing expensive lime treatments.
In acidic soils, aluminum dissolves into a form that poisons plant roots, stunting growth and reducing harvests. Researchers compared tomato plants that are extra-sensitive to a natural growth hormone called auxin against plants that are less sensitive. The extra-sensitive plants handled aluminum toxicity far better, keeping their root tips healthy and growing, while the less-sensitive plants showed root damage and a buildup of harmful molecules.
Key Findings
Tomato mutants with increased auxin sensitivity (entire) tolerated toxic aluminum levels, while those with reduced auxin sensitivity (dgt) showed significantly greater damage.
The dgt mutant accumulated more reactive oxygen species (cell-damaging molecules) in the root transition zone and showed advanced cell differentiation, indicating premature root growth arrest.
The entire mutant maintained root meristematic (actively dividing) cells with minimal metabolic disruption under aluminum stress, while dgt roots showed broader metabolic changes linked to aluminum sensitivity.
chevron_right Technical Summary
Scientists discovered that tomato plants with heightened sensitivity to the hormone auxin can survive toxic aluminum levels in acidic soils — a major barrier to food production worldwide. This finding suggests that tweaking how plants respond to auxin could be a path toward crops that grow in soils where most plants struggle.
Abstract Preview
Acidic soils limit food production in many developing countries by promoting the solubilization of aluminium (Al) cations. Consequently, roots absorb this metal from soil solution, arresting their ...
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