Theoretical and Applied Genetics

, Volume 88, Issue 6–7, pp 707–716 | Cite as

Retrospective analysis of the relationships among the test environments of the Southern Queensland sugarcane breeding programme

  • P. D. N. Mirzawan
  • M. Cooper
  • I. H. DeLacy
  • D. M. Hogarth
Article

Abstract

Repeatability of aspects of genotype by environment (GxE) interactions is an important factor to be assessed in designing more efficient selection programmes. Sugar yield data from multi environment trials (METs) which were part of the sugarcane breeding programme in southern Queensland were analysed. Data were obtained from 71 environments consisting of trials planted from 1986 to 1989. Retrospective analysis on these data was conducted to assess the repeatability of the clone by environment (CxE) interactions over locations and years. This analysis focussed on identifying similarities among test environments in the way they discriminated among clones for sugar yield. Analyses of variance and pattern analyses on environments over years based on standardised data were conducted. The pattern analyses were done sequentially according to the accumulated data sets over years. Squared Euclidean distances among environments were averaged over data sets and years before pattern analyses across the data sets were conducted. A graphical methodology was developed to present the results of the cumulative historical analysis. CxE interactions of a magnitude which affected selection decisions were present in each data set studied. Pattern analyses on cumulative data sets identified environmental groupings that were based on geographical positions. Each location generated a different pattern of discrimination among the clones. These results emphasised the importance of clone by location (CxL) interactions in southern Queensland and the need to concentrate more on testing across locations than on ratooning ability within a location. The classifications identified similarities among ratoon crops within a location, differences among locations and differences between ratoon crops and their plant crop (PC). This suggested that some aspects of CxL and clone by crop-year (CxY) interactions were repeatable across years. The potential applications of these results to increase efficiency of the sugarcane breeding programme, such as the possibility of applying indirect selection among environments generating similar discrimination among clones, are discussed.

Key words

GxE interactions Retrospective analysisPattern analysis Multi environment trials Sugarcane 

Abbreviations

GxE

Genotype-by-environment interactions

METs

multi-environment trials

CxE

clone-by-en-vironment interactions

CxL

clone-by-location interactions

PC

plant crop

CxY

clone-by-crop-year interactions

CxLxF

clone-by-location-by-crop-year interactions

SYT

substation yield trials

BSES

Bureau of SugarExperiment Stations

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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • P. D. N. Mirzawan
    • 1
  • M. Cooper
    • 1
  • I. H. DeLacy
    • 1
  • D. M. Hogarth
    • 2
  1. 1.Department of AgricultureThe University of QueenslandAustralia
  2. 2.Bureau of Sugar Experiment StationsIndooroopillyAustralia

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