Summary
This study evaluated phosphorus efficiency across 32 potato genotypes to identify cultivars and traits supporting reduced mineral P inputs. Through controlled pot experiments with contrasting P-fertilisation regimes, researchers found significant genotypic variation in P utilisation efficiency and demonstrated that phosphorus acquisition efficiency and root system size are key traits associated with P acquisition on deficient soils. The finding that tuber yields were not significantly reduced under suboptimal soil P conditions suggests breeding for P-efficient varieties may reduce fertiliser requirements without yield penalty.
UK applicability
The findings are potentially applicable to UK potato production given shared temperate growing conditions and increasing regulatory pressure to reduce nutrient run-off. Identifying P-efficient cultivars could support sustainable intensification of UK horticulture, though genotype performance would require validation under UK soil and climate conditions.
Key measures
Phosphorus utilisation efficiency (PUtE); phosphorus acquisition efficiency (PAE); relative biomass production; total root length; root phosphatase activity; miR399 expression; tuber yield under high and low P-fertilisation strategies
Outcomes reported
The study characterised phosphorus efficiency differences among 32 potato accessions and identified mechanisms underlying P efficiency through pot experiments measuring agronomic traits, root development, phosphatase activity and miR399 expression under contrasting P-fertilisation regimes. Findings indicated that phosphorus acquisition efficiency (PAE) and large root systems are important traits for P-efficient varieties on deficient soils, whilst tuber yields were maintained under suboptimal soil P conditions.
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