Induction ofin vivoroot ferric chelate reductase activity in fruit tree rootstock

Summary

This study demonstrates a reproducible method to induce root ferric chelate reductase activity in peach rootstock GF 677 by cycling between iron deficiency and iron resupply. The enzyme activity response was spatially localised to the subapical root zone and reached 20-fold higher levels than in iron-deficient plants within 24 hours of iron resupply. The authors propose this induction protocol as a screening tool for selecting rootstock genotypes tolerant to iron-induced chlorosis.

Regional applicability

This work on physiological iron-stress responses in tree rootstocks is of potential relevance to UK horticulture where calcareous or iron-poor soils can restrict fruit production, though the study does not address UK-specific soil or climate conditions and transferability would depend on local rootstock selections and soil chemistry.

Key measures

Root ferric chelate reductase activity (nmol Fe reduced per gram fresh mass per minute, measured in vivo using BPDS); visual chlorosis symptoms; nutrient solution pH; root morphology

Outcomes reported

The study developed a method to consistently induce root ferric chelate reductase activity in peach rootstock GF 677 under iron deficiency conditions. Root enzyme activity increased 20-fold within one day of iron resupply after iron-deficiency stress, localised to the subapical root zone.

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