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Uptake and distribution of boron in canola at vegetative and early flowering stages using boron buffered solution culture

Asad, A., Bell, R.W.ORCID: 0000-0002-7756-3755 and Dell, B. (2000) Uptake and distribution of boron in canola at vegetative and early flowering stages using boron buffered solution culture. Communications in Soil Science and Plant Analysis, 31 (11-14). pp. 2233-2249.

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In conventional solution culture, differences in boron (B) concentration among plant parts and in distribution over time are often confounded with declining B supply. Using a B‐buffered solution system which maintained solutions at values that ranged from deficient to adequate, we examined B uptake and distribution in canola (Brassica napus L.) at 3 growth stages: 10 and 22 days after transplanting (DAT) and at early flowering (55 DAT). Boron concentrations in shoots and roots increased strongly with increasing solution B concentrations up to 1–2 μM B and then more weakly with increases in solution B above 2 μM B. At deficient to marginal external B concentrations, stems had higher B concentrations than leaf blades on Days 10 and 22 but not at adequate external B concentrations. In petioles, B concentration remained unchanged from Day 22 to 55 in most B treatments. With increasing external B concentrations, relative B content increased in leaf blades, decreased in roots, and generally remained unchanged in stems and petioles. Although the plants at low external B concentrations (≤ 0.55 μM) maintained vegetative growth they did not produce reproductive parts in contrast to the plants of adequate B. At the flowering stage, maximum B concentration was found in florets and growth of these plant parts was more sensitively depressed by low B than vegetative plant parts. At ≤ 0.41 μM external B concentration, reproductive growth was depressed compared to plants of ≥ 0.86 μM external B concentration, flowering was delayed for 6–8 days, and flowers aborted soon after bud burst.

Item Type: Journal Article
Murdoch Affiliation(s): School of Environmental Science
Publisher: Marcel Dekker Inc.
Copyright: 2000 Marcel Dekker Inc.
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