Effect of root zone temperature on oilseed rape ( Brassica napus ) response to boron

Ye, Z., Bell, R.W.ORCID: 0000-0002-7756-3755, Dell, B., Huang, L. and Xu, Q. (2006) Effect of root zone temperature on oilseed rape ( Brassica napus ) response to boron. Communications in Soil Science and Plant Analysis, 37 (15-20). pp. 2791-2803.

Abstract

Oilseed rape (Brassica napus) is sensitive to low boron (B) supply, and its growth response to B may be influenced by soil temperature. To test the relationship between B and temperature, oilseed rape (cv. Hyola 42) seedlings were grown at 10°C (low) root zone temperature (RZT) with B supply from deficient to adequate B levels until growth of low B plants just began to slow down. Half of the pots were then transferred to 20°C (warm) RZT for 11 days before they were moved back to 10°C RZT for the final 4 days. Both plant dry mass and B uptake increased after plants were exposed to warm RZT. However, plant B deficiency was exacerbated by warm RZT in low B plants because of increased relative growth rate and shoot–root ratio without a commensurate increase in B uptake rate. It is concluded that RZT above the critical threshold for chilling injury in oilseed rape can nevertheless affect the incidence of B deficiency by altering shoot–root ratio and hence the balance between shoot B demand and B uptake.

Item Type:	Journal Article
Murdoch Affiliation:	School of Environmental Science
Publisher:	Marcel Dekker Inc.
Copyright:	© Taylor & Francis Group, LLC
URI:	http://researchrepository.murdoch.edu.au/id/eprint/6622

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