Avoiding lodging in irrigated spring wheat. I. Stem and root structural requirements
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.
| Main Authors: | , , , , |
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| Format: | Article biblioteca |
| Language: | English |
| Published: |
Elsevier
2016
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| Subjects: | AGRICULTURAL SCIENCES AND BIOTECHNOLOGY, Lodging-Proof Ideotype, Stem Strength, Anchorage Strength, Root Plate Spread, Grain Yield, Stem Biomass, SPRING WHEAT, GENETIC VARIATION, STEMS, CROP YIELD, ROOT SYSTEMS, |
| Online Access: | http://hdl.handle.net/10883/18840 |
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