Plant and Soil

, Volume 243, Issue 2, pp 243–252 | Cite as

Dry matter production and boron concentrations of vegetative and reproductive tissues of canola and sunflower plants grown in nutrient solution

  • A. Asad
  • F. P. C. Blamey
  • D. G. Edwards


Canola (Brassica napus L.) and sunflower (Helianthus annuus L.), two important oilseed crops, are sensitive to low boron (B) supply. Symptoms of B deficiency are often more severe during the reproductive stage, but it is not known if this is due to a decreased external B supply with time or an increased sensitivity to low B during this stage. Canola and sunflower were grown for 75 days after transplanting (DAT) in two solution culture experiments using Amberlite (IRA-743) B-specific resin to maintain constant B concentration in solution over the range 0.6 – 53 μM. Initially, the vegetative growth of both crops was good in all treatments. With the onset of the reproductive stage, however, severe B deficiency symptoms developed and growth of canola and sunflower was reduced with ≤ 0.9 and ≤ 0.7 μM B, respectively. At these concentrations, reproductive parts failed to develop. The critical B concentration (i.e. 90% of maximum shoot dry matter yield) in the youngest opened leaf was 18 mg kg−1 in canola and 25 mg kg−1 in sunflower at 75 DAT. The results of this study indicate that the reproductive stage of these two oilseed crops is more sensitive than the vegetative stage to low B supply.

boron canola deficiency reproduction solution culture sunflower 


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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • A. Asad
    • 1
  • F. P. C. Blamey
    • 1
  • D. G. Edwards
    • 1
  1. 1.School of Land and Food SciencesThe University of QueenslandBrisbaneAustralia

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