Hybrid breeding in wheat: how shaping floral biology can offer new perspectives
Caterina Selva A , Matteo Riboni A , Ute Baumann A , Tobias Würschum B , Ryan Whitford A C and Matthew R. Tucker A CA School of Agriculture Food and Wine, University of Adelaide, Waite Campus, Urrbrae, SA 5064, Australia.
B State Plant Breeding Institute, University of Hohenheim, 70593 Stuttgart, Germany.
C Corresponding authors. Email: ryan.whitford@adelaide.edu.au; matthew.tucker@adelaide.edu.au
Functional Plant Biology 47(8) 675-694 https://doi.org/10.1071/FP19372
Submitted: 19 December 2019 Accepted: 21 March 2020 Published: 15 June 2020
Abstract
Hybrid breeding in wheat (Triticum aestivum L.) has the potential to deliver major yield increases. This is a requisite to guarantee food security for increasing population demands and to counterbalance the effects of extreme environmental conditions. Successful hybrid breeding in wheat relies on forced outcrossing while preventing self-pollination. To achieve this, research has been directed towards identifying and improving fertility control systems. To maximise cross-pollination and seed set, however, fertility control systems need to be complemented by breeding phenotypically distinct male and female lines. This review summarises existing and novel male sterility systems for wheat hybridisation. We also consider the genetic resources that can be used to alter wheat’s floral development and spike morphology, with a focus on the genetic variation already available. Exploiting these resources can lead to enhanced outcrossing, a key requirement in the progress towards hybrid wheat breeding.
Additional keywords: cereals, crop, flower, heterosis, mutants, spike.
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