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Response of Eucalyptus camaldulensis Dehnh., E. globulus Labill. ssp. globulus and E. grandis W. Hill to excess boron and sodium chloride

Nico E. Marcar, Jianmin Guo and Debbie F. Crawford
Plant and Soil
Vol. 208, No. 2 (1999), pp. 251-257
Published by: Springer
Stable URL: http://www.jstor.org/stable/42949555
Page Count: 7
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Response of Eucalyptus camaldulensis Dehnh., E. globulus Labill. ssp. globulus and E. grandis W. Hill to excess boron and sodium chloride
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Abstract

In a sand culture experiment we investigated the effects of boron (0.01, 0.19, 0.46 and 0.93 mol m⁻³ B, as H₃BO₃), sodium chloride (0, 100 and 200 mol m⁻³ NaCl) and combined B and NaCl, over 36 days, on growth, water use and foliar ion concentrations of nine week-old seedlings of three fast-growing, commercial eucalypts (Eucalyptus camaldulensis Dehnh., E. globulus Labili, ssp. globulus and E. grandis W. Hill.). Shoot dry weight was significantly reduced by high concentrations of NaCl (p < 0.001) and by B and NaCl in combination (p ≤ 0.05) but not by B alone. Root dry weight was significantly reduced by both NaCl (p < 0.001) and B (p < 0.001), but not by combined B and NaCl. Foliar B concentrations increased with higher concentrations of applied B and decreased with higher NaCl concentrations. Foliar Na concentrations were greater with higher NaCl concentrations, whereas B application had no significant effect on foliar Na concentrations. All three species accumulated relatively high B concentrations in leaves. Severe boron toxicity symptoms (BTS) were apparent only when leaf B concentrations exceeded 50 mol × 10⁻⁶ g⁻¹, but even at these high concentrations plant growth was only slightly reduced. E. camaldulensis showed least development of BTS, the lowest leaf B concentrations and least reduction in height growth due to B and NaCl. The results suggest that there was a correlation between both B tolerance and B accumulation in leaves and between tolerance to B and NaCl.

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