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Temporal variation in root penetration ability of wheat genotypes through thin wax layers in contrasting water regimes and in the field


Botwright Acuna, TL and He, X and Wade, LJ, Temporal variation in root penetration ability of wheat genotypes through thin wax layers in contrasting water regimes and in the field, Field Crops Research, 138 pp. 1-10. ISSN 0378-4290 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 Elsevier B.V.

DOI: doi:10.1016/j.fcr.2012.09.018


A significant proportion of arable land in south-western Australia is highly susceptible to subsoil compaction, which limits access of roots of wheat to water and nutrients at depth. Australian wheat cultivars were shown to differ in penetration ability. The objective of this paper was to examine the dynamics of penetration ability and temporal variation in root growth using contrasting cultivars, with and without a thin wax layer, in contrasting water regimes, and in the field on two contrasting soil types at Merredin, Western Australia. The presence of a wax layer had a significant impact on root dry matter (DM) distribution and root number, which were more abundant above the wax layer. Root axes below the wax layer were around 50% shorter compared with columns without wax layers. Around 15% more nodal roots were produced in columns containing wax layers than those without and this difference was apparent from an early stage of plant growth, as was the impact of water deficit that decreased root DM and nodal root number above the wax layer. Root axes of genotypes Bonnie Rock, Castle Rock, Halberd and Spear all penetrated the wax layer, while CM18 and Cranbrook had limited or no success, regardless of water regime. The maximum root depths in field soils at 75 and 90 DAS were relatively shallow at 3548 cm, but with a relatively small variance. On a sandy duplex containing a hardpan, CM18 and Cranbrook had 28% shorter roots than Bonnie Rock and Halberd at 75 DAS, which was consistent with the poor ability of roots of CM18 and Cranbrook to penetrate wax layers. Adaptation of roots to soil physical constraint thus provides benefit for root access to deeper soil layers.

Item Details

Item Type:Refereed Article
Keywords:water deficit, traffic pan, nodal roots, seminal roots, Triticum aestivum L.
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Crop and pasture biochemistry and physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Wheat
UTAS Author:Botwright Acuna, TL (Associate Professor Tina Acuna)
ID Code:79837
Year Published:2012
Web of Science® Times Cited:7
Deposited By:Agricultural Science
Deposited On:2012-10-05
Last Modified:2018-03-13

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