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Grain yield responsiveness to water supply in near-isogenic reduced-tillering wheat lines – an engineered crop trait near its upper limit

journal contribution
posted on 05.09.2019, 00:00 authored by A Houshmandfar, GJ Rebetzke, R Lawes, Michael Tausz
Grain yield responsiveness to water supply was evaluated in spring wheat (Triticum aestivum L.) near-isogenic lines (NILs) for presence of the reduced-tillering ‘tin’ (tiller inhibition) gene using boundary-line analysis. Data were collected from multiple seasons at Managed Environment Facilities (MEFs; field experimental facilities to control and target water supply) at three locations across the Australian wheatbelt. The minimum water required to obtain a measurable yield was less in reduced-tillering than free-tillering NILs (70 vs 95 mm). Above this minimum, for every mm increase in water supply, grain yield in free-tillering lines increased more rapidly (that is, showed greater responsiveness) than reduced-tillering lines (15.4 vs 12.6 kg ha−1 mm−1). This difference suggests the reduced-tillering gene is associated with greater yield potential in situations with water supply of less than 200 mm. Reduced-tillering wheat also affords a 0.3 t ha−1 yield benefit in extremely water-limited, low yielding situations where no measurable yield is expected with free-tillering wheats (i.e. at water supply 95 mm). These specific adaptations need to be considered when contemplating the use of reduced-tillering wheats in dryland systems where water is a key limiting factor. © 2018 Elsevier B.V.

Funding

Other

History

Volume

102

Start Page

33

End Page

38

Number of Pages

6

eISSN

1873-7331

ISSN

1161-0301

Publisher

Elsevier, Netherlands

Peer Reviewed

Yes

Open Access

No

Acceptance Date

09/11/2018

External Author Affiliations

CSIRO;

Author Research Institute

Institute for Future Farming Systems

Era Eligible

Yes

Journal

European Journal of Agronomy