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Absorption and mobility of foliar-applied boron in soybean as affected by plant boron status and application as a polyol complex
Silke Will; Thomas Eichert; Victoria Fernández; Jens Möhring; Torsten Müller; Volker Römheld
Original research article
Lab study
Soybean
Boron
View source document
year
2011
Country
Germany
Abstract

In the present study (i) the impact of plant Boron (B) status on foliar B absorption and (ii) the effect of B complexation with polyols (sorbitol or mannitol) on B absorption and translocation was investigated. Soybean ( Glycine max (L.) Meer.) plants grown in nutrient solution containing 0 µM, 10 µM, 30 µM or 100 µM B labelled boric acid (BA) were treated with 50 m MB labelled BA applied to the basal parts of two leaflets of one leaf, either pure or in combination with 500 m M sorbitol or mannitol. After one week, B concentrations in different plant parts were determined. In B deficient leaves (0 µM B), B absorption was significantly lower than in all other treatments (9.7% of the applied dose vs. 26%-32%). The application of BA in combination with polyols increased absorption by 18-25% as compared to pure BA. The absolute amount of applied B moving out of the application zone was lowest in plants with 0 µM B supply (1.1% of the applied dose) and highest in those grown in 100 µM B (2.8%). The presence of sorbitol significantly decreased the share of mobile B in relation to the amount absorbed. The results suggest that B deficiency reduces the permeability of the leaf surface for BA. The addition of polyols may increase B absorption, but did not improve B distribution within the plant, which was even hindered when applied a sorbitol complex.

Outcomes reported
Nutrient uptake
Synthesis
Key insight
Polyol-complexed foliar boron increased leaf absorption but did not improve boron mobility within soybean plants.
Limitations
Controlled climate-chamber nutrient-solution study without field yield outcomes.
Welland | Ontario | Canada‍
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