Root Pruning and Transplanting Increase Zinc Requirements of Canola (Brassica napus)

Mulyati, Bell, Richard W. and Huang, Longbin (2009) Root Pruning and Transplanting Increase Zinc Requirements of Canola (Brassica napus). Plant and Soil, 314 1-2: 11-24. doi:10.1007/s11104-008-9701-6

Author Mulyati
Bell, Richard W.
Huang, Longbin
Title Root Pruning and Transplanting Increase Zinc Requirements of Canola (Brassica napus)
Formatted title
Root Pruning and Transplanting Increase Zinc Requirement of Canola (Brassica napus)
Journal name Plant and Soil   Check publisher's open access policy
ISSN 0032-079X
Publication date 2009-01
Year available 2008
Sub-type Article (original research)
DOI 10.1007/s11104-008-9701-6
Volume 314
Issue 1-2
Start page 11
End page 24
Total pages 14
Editor Ismail Cakmak
Place of publication Dordrecht, The Netherlands
Publisher Springer Netherlands
Collection year 2010
Language eng
Subject 070306 Crop and Pasture Nutrition
079902 Fertilisers and Agrochemicals (incl. Application)
820502 Canola
Formatted abstract
Previous field and glasshouse studies suggested that oilseed rape (Brassica napus L.) was especially sensitive to zinc (Zn) deficiency in the recovery period following transplanting. However, it is not clear whether transplanting, per se, or root damage during transplanting was primarily responsible. Three glasshouse experiments were carried out to test the hypothesis that transplanting increases external Zn requirement of canola cv. Hyola 42 during its post-transplanting recovery. Canola was either directly sown into Zn-treated soils or transplanted at four-leaf stage, and grown until harvest at 7- and 10-leaf stages. In a second experiment with chelate-buffered solution culture, direct-sown and transplanted plants were treated with three concentrations of Zn. In the third experiment, plants were given three levels of Zn supply, and either direct-sown into soils or transplanted at four-leaf stage with pruned (50% of roots removed) or unpruned root systems. Transplanted plants required higher soil Zn supply for maximum root length and root dry weight than direct-sown plants. By contrast, shoots required similarly low external Zn for maximum dry weight in both direct-sown and transplanted plants in soil. Direct-sown plants were more efficient in utilizing soil supplied Zn than transplanted plants particularly compared to those transplanted with a pruned root system, and achieved maximum growth at 100 μg Zn kg−1 soil compared to 500 μg Zn kg−1 required by transplanted plants. Since the higher external Zn requirement for the growth of transplanted plants was also obtained in well-stirred solution culture, it was concluded that it was related to the time required for transplanted plants to recover from root injury and re-establish a favourable shoot: root ratio rather than to rhizosphere modification processes. Both transplanting, per se, and root damage during transplanting appeared to contribute to higher external Zn requirements for canola growth compared to direct-sown plants. 
Keyword External Zn
Root length
Root: shoot ratio
Zn supply
Q-Index Code C1
Q-Index Status Provisional Code
Additional Notes Published online: 29 July 2008

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Mined Land Rehabilitation Publications
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 12 Mar 2010, 12:13:10 EST by Maria Campbell on behalf of Sustainable Minerals Institute