Lodging: The great fall of barley
Date
2022-03-08
Authors
Taylor, Michael
Ye, S.
Ferre, C.
Yang, X.
Pradier, P-L.
Kochian, L.V.
Noble, S.
Feurtado, J.A.
Beattie, A.D.
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Abstract
Lodging, the permanent displacement of shoots from an upright position, causes millions of dollars in lost profits due to decreases in grain yield. In addition to yield, lodging also reduces grain quality due to increased shriveling, premature sprouting, and disease prevalence. The degree of lodging can vary from laying flat on the ground to only slight leaning, regardless of the severity – lodging leads to losses. Lodging is a complex phenomenon caused by both stem buckling and root anchorage failure and is impacted by numerous plant anatomical and morphological aspects which influence plant strength to counteract wind-induced leverage forces and reductions in soil shear strength. This study collected data for above and below ground traits to investigate which plant traits have the greatest influence on lodging resistance across 12 cultivars. Field trials assessed several above-ground plant traits, including stem internode strength, stem diameter, stem width and whole plant bending resistance. In addition, field lodging ratings were obtained from locations that experienced significant lodging. Analysis of root system architecture was accomplished by imaging roots at growth stages ranging from 3-day-old seedlings to 12-week-old mature plants using a combination of hydroponic and rhizobox (soil) based phenotyping systems. Several traits including root network solidity and seminal root angle were found to be significantly correlated with field lodging ratings. The discovery of traits underlying barley lodging resistance facilitates future marker development and gene discovery. Furthermore, assessments of these key traits at early growth stages offer the possibility for barley breeders to: (i) assess lodging resistance (standability) quickly and efficiently and (ii) avoid solely relying on field observations especially when environmental conditions are not conducive for lodging.
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Lodging, Barley, Root System Architecture
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Soils and Crops Workshop