Hybrid variation for root system efficiency in maize: potential links to drought adaptation
Erik J. van Oosterom A F , Zongjian Yang B C , Fenglu Zhang D , Kurt S. Deifel A , Mark Cooper E , Carlos D. Messina E and Graeme L. Hammer A
+ Author Affiliations
- Author Affiliations
A The University of Queensland, Queensland Alliance for Agriculture and Food Innovation, Centre for Plant Science, Brisbane, Qld 4072, Australia.
B The University of Queensland, School of Agriculture and Food Sciences, Brisbane, Qld 4072, Australia.
C Present address: ACT Health, 1 Moore Street, Canberra, ACT 2601.
D Department of Agronomy and Farming Systems, College of Agronomy, Agricultural University of Hebei, Baoding 071001, P. R. China.
E DuPont Pioneer, 7250 NW 62nd Avenue, Johnston, IA 50131, United States of America.
F Corresponding author. Email: erik.van.oosterom@uq.edu.au
Functional Plant Biology 43(6) 502-511 https://doi.org/10.1071/FP15308
Submitted: 28 September 2015 Accepted: 12 February 2016 Published: 26 April 2016
Abstract
Water availability can limit maize (Zea mays L.) yields, and root traits may enhance drought adaptation if they can moderate temporal patterns of soil water extraction to favour grain filling. Root system efficiency (RSE), defined as transpiration per unit leaf area per unit of root mass, represents the functional mass allocation to roots to support water capture relative to the allocation to aerial mass that determines water demand. The aims of this study were to identify the presence of hybrid variation for RSE in maize, determine plant attributes that drive these differences and illustrate possible links of RSE to drought adaptation via associations with water extraction patterns. Individual plants for a range of maize hybrids were grown in large containers in shadehouses in Queensland, Australia. Leaf area, shoot and root mass, transpiration, root distribution and soil water were measured in all or selected experiments. Significant hybrid differences in RSE existed. High RSE was associated with reduced dry mass allocation to roots and more efficient water capture per unit of root mass. It was also weakly negatively associated with total plant dry mass, reducing preanthesis water use. This could increase grain yield under drought. RSE provides a conceptual physiological framework to identify traits for high-throughput phenotyping in breeding programs.
Additional keywords: partitioning, root distribution, transpiration, transpiration efficiency, water uptake, Zea mays L.
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