Indirect selection using reference and probe genotype performance in multi-environment trials

Mathews, Ky L., Trethowan, Richard, Milgate, Andrew W., Payne, Thomas, van Ginkel, Maarten, Crossa, Jose, DeLacy, Ian, Cooper, Mark and Chapman, Scott C. (2011) Indirect selection using reference and probe genotype performance in multi-environment trials. Crop and Pasture Science, 62 4: 313-327. doi:10.1071/CP10318


Author Mathews, Ky L.
Trethowan, Richard
Milgate, Andrew W.
Payne, Thomas
van Ginkel, Maarten
Crossa, Jose
DeLacy, Ian
Cooper, Mark
Chapman, Scott C.
Title Indirect selection using reference and probe genotype performance in multi-environment trials
Journal name Crop and Pasture Science   Check publisher's open access policy
ISSN 0004-9409
1836-0947
1836-5795
Publication date 2011
Sub-type Article (original research)
DOI 10.1071/CP10318
Volume 62
Issue 4
Start page 313
End page 327
Total pages 15
Place of publication Collingwood, VIC, Australia
Publisher CSIRO Publishing
Collection year 2012
Language eng
Formatted abstract
There is a substantial challenge in identifying appropriate cultivars from databases for introduction into a breeding program. We propose an indirect selection procedure that illustrates how strategically designed multi-environment trials, linked to historical performance databases, can identify germplasm to meet objectives of plant breeding programs.

Two strategies for indirect selection of germplasm from the International Wheat and Maize Improvement Center’s (CIMMYT) trial database were developed based on reference and probe genotype sets included in the International Adaptation Trial (IAT). The IAT was designed to improve the understanding of relationships among global spring wheat (Triticum spp.) locations. Grain yield (t/ha) data were collated from 183 IAT trials grown in 40 countries (including Australia) between 2001 and 2004.

The reference genotype set strategy used the genetic correlations among locations in the IAT to identify locations similar to a target environment. For a key southern Australian breeding location, Roseworthy, the number of cultivars targeted for selection was reduced to 35% of the original 1252. The Irrigated Winter Cereals Trials (2008–09) aimed to identify high yield potential lines in south-eastern Australian irrigated environments. Thirty-five CIMMYT cultivars identified using the reference genotype selection strategy were grown in this trial series. In all trials, the proportion of CIMMYT cultivars in the top 20% yielding lines exceeded the expected proportion, 0.20.

The probe genotype strategy utilised contrasting line yield responses to assess the occurrence of soil-borne stresses such as root lesion nematode (Pratylenchus thorneii) and boron toxicity. For these stresses, the number of targeted cultivars was reduced to 25% and 83% of the original 1252, respectively.
Keyword Environment characterisation
Genotype-by-environment interaction
Response to selection
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Agriculture and Food Sciences
 
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Created: Fri, 23 Mar 2012, 16:19:40 EST by Dr Ian Delacy on behalf of School of Agriculture and Food Sciences