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Abstract Detail



Agronomy

Ganegama Lekamge, Dhanuja Neranjalee Abeysingha [1], Ozga, Jocelyn A. [2], Strydhorst, Sheri [3], Doyle, Patrick [3], Reinecke, Dennis M. [3].

The effect of auxins on grain yield in wheat under controlled environment and Western Canadian field conditions.

High temperature and lower precipitation during the reproductive growth stage of wheat results in extensive yield losses. This study tests the hypothesis that application of specific auxins to wheat plants will increase grain yield under normal and heat stress conditions when the stress occurs during reproductive development. Two structurally different auxins, 4-chloroindole-3-acetic acid (4-Cl-IAA) and 4-methylindole-3-acetic acid (4-Me-IAA) were applied to hard-red spring wheat cultivars (Triticum aestivum L.) prior to flowering (BBCH 43-45). In the cultivar CDC GO, under controlled environment conditions 4-Cl-IAA increased grain yield per plant 33% under heat stress (during initial flowering) and 20% under control conditions. The 4-Cl-IAA-induced increase in grain yield per plant of CDC GO was a reflection of increased number of grains per plant under the heat stress conditions. 4-Cl-IAA also increased grain yield per plot in the 2012 (8%) and 2013 (6%) field seasons at the site with higher mid-season temperatures and lower moisture conditions (Saskatoon). In 2013, the 4-Cl-IAA-induced increase in grain yield at the Saskatoon site was also associated with an increase in number of grains per plant. 4-Me-IAA (1√ó10-6 M) increased grain yield per plot (5%) at the Saskatoon site in the 2012. CDC GO has the Rht-B1b mutant allele imparting a semi-dwarf habit. Experiments using wheat lines isogenic for the wild-type and mutant alleles of Rht-B1 and Rht-D1 suggest that the presence of the dwarfing genes Rht-B1b or Rht-D1b alone does not directly affect the ability of 4-Cl-IAA to increase grain yield. Overall, these data suggest that one application of the auxin 4-Cl-IAA applied prior to/at flowering has the ability to increase grain yield in specific cultivars of hard-red spring wheat grown under heat stress and non-heat stress conditions.


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1 - University of Alberta, Agriculture Food and Nutritional Siences, Plant BioSystems Group, of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, Alberta, T6G 2P5, Canada
2 - University of Alberta, Agriculture Food and Nutritional Sience, Plant BioSystems Group, of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, Alberta, T6G 2P5, Canada
3 - University of Alberta, Plant BioSystems Group, of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, Alberta, T6G 2P5, Canada

Keywords:
Auxins
4-Cl-IAA†
4-Me-IAA†
hard-red spring wheat †.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PAG001
Abstract ID:951
Candidate for Awards:CSA Graduate Student Competition for Best Poster Presentation


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