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Avoiding lodging in irrigated spring wheat. I. Stem and root structural requirements

Pi�era-Chavez, F.J.; Berry, P.M.; Foulkes, M.J.; Jesson, M.A.; Reynolds, M.P.

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Authors

F.J. Pi�era-Chavez

P.M. Berry

M.A. Jesson

M.P. Reynolds



Abstract

A model of the lodging process has been successfully adapted for use on spring wheat grown in North-West Mexico (NWM). The lodging model was used to estimate the lodging-associated traits required to enable spring wheat grown in NWM with a typical yield of 6 t ha?1 and plant height of 0.7 m to achieve a lodging return period of 25 years. Target traits included a root plate spread of 51 mm and stem strength of the bottom internode of 268 N mm. These target traits increased to 54.5 mm and 325 N mm, respectively, for a crop yielding 10 t ha?1. Analysis of multiple genotypes across three growing seasons enabled relationships between both stem strength and root plate spread with structural dry matter to be quantified. A NWM lodging resistant ideotype yielding 6 t ha?1 would require 3.93 t ha?1 of structural stem biomass and 1.10 t ha?1 of root biomass in the top 10 cm of soil, which would result in a harvest index (HI) of 0.46 after accounting for chaff and leaf biomass. A crop yielding 10 t ha?1 would achieve a HI of 0.54 for 0.7 m tall plants or 0.41 for more typical 1.0 m tall plants. This study indicates that for plant breeders to achieve both high yields and lodging-proofness they must either breed for greater total biomass or develop high yielding germplasm from shorter crops.

Journal Article Type Article
Acceptance Date Jun 16, 2016
Online Publication Date Jun 30, 2016
Publication Date Sep 30, 2016
Deposit Date Sep 13, 2017
Publicly Available Date Sep 13, 2017
Journal Field Crops Research
Print ISSN 0378-4290
Electronic ISSN 1872-6852
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 196
DOI https://doi.org/10.1016/j.fcr.2016.06.009
Keywords Spring wheat; Lodging-proof ideotype; Stem strength; Anchorage strength; Root plate spread; Grain yield; Stem biomass
Public URL https://nottingham-repository.worktribe.com/output/808629
Publisher URL http://www.sciencedirect.com/science/article/pii/S0378429016301873?via%3Dihub

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