Main content

Impact of Varietal Differences in Water Use Efficiency on Soybean Yield under Water Stress

Show full item record

Title: Impact of Varietal Differences in Water Use Efficiency on Soybean Yield under Water Stress
Author: Visser, Bridget
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Earl, Hugh J.
Abstract: Naturally-occurring water stress causes yield losses in Ontario soybean. The role of water use efficiency (WUE) in drought tolerance of soybean is investigated. There is genetic variation for WUE within commercially grown varieties. We hypothesized that high WUE conveys resistance to yield loss under rain-fed conditions in Ontario. Varieties whose WUE varied over a range of 16% under greenhouse conditions, were grown under two soil water conditions, rain-fed and water-replete, in 2011-2013 in a replicated field experiment. Yield loss due to water deficit occurred yearly, even with above-average rainfall, with pod number being the most impacted yield component. Contrary to the hypothesis, high-WUE varieties did not have a measurable yield advantage under rain-fed conditions. This may be due to the physiological basis of the variation in WUE, since in the greenhouse screening a high WUE was consistently associated with high biomass production but also increased water use, not water conservation.
URI: http://hdl.handle.net/10214/8193
Date: 2014-06
Terms of Use: All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.


Files in this item

Files Size Format View Description
Visser_Bridget_201406_Msc.pdf 1.204Mb PDF View/Open Thesis (Fixed)

This item appears in the following Collection(s)

Show full item record