Selection among genotypes in final stage sugarcane trials: Effects of time of year

Rattey, A. R., Jackson, P. A., Hogarth, D. M. and McRae, T. A. (2009) Selection among genotypes in final stage sugarcane trials: Effects of time of year. Crop and Pasture Science, 60 12: 1165-1174. doi:10.1071/CP09136

Author Rattey, A. R.
Jackson, P. A.
Hogarth, D. M.
McRae, T. A.
Title Selection among genotypes in final stage sugarcane trials: Effects of time of year
Journal name Crop and Pasture Science   Check publisher's open access policy
ISSN 1836-0947
Publication date 2009-01-01
Year available 2009
Sub-type Article (original research)
DOI 10.1071/CP09136
Volume 60
Issue 12
Start page 1165
End page 1174
Total pages 10
Place of publication Collingwood, VIC Australia
Publisher C S I R O Publishing
Language eng
Subject 1102 Cardiovascular Medicine and Haematology
1110 Nursing
Abstract Low levels of commercial cane sugar (CCS) reduce relative economic value (REV) in sugarcane. In the Australian sugarcane industry, CCS is lower early (June) compared with the completion (November) of the harvest period. Performance of sugarcane genotypes in 2 Central region series and 1 Burdekin region series of final stage selection trials was examined to determine if independent selection programs are required to select elite genotypes for 2 target periods: (a) early (before July), and (b) mature (from July on). Across series, CCS (16.83 v. 12.02% fresh cane weight) and REV (AUS3937/ha v. S3123/ha) were significantly higher in the mature than in the early period, while genotypic variance for CCS (0.76 v. 0.33), and broad-sense heritability for CCS (0.96 v. 0.86) and REV (0.79 v. 0.69), were higher in the early than in the mature period. Genetic correlations between sample times less than 3 months apart were usually ≥0.9 for CCS, but generally declined to ≤0.6 for times greater than 3 months apart. Consequently, genotype × period (early compared with mature) interaction effects on CCS affected selection decisions, especially in the Central region, and genetic improvements for CCS would be expected via specific targeting of early and mature periods. However, genotype × period interaction effects were not important for cane yield or REV, such that selection for specific adaptation to early or mature periods would not improve gains in REV across the entire harvest period. Some final stage selection trials should be harvested early in the harvest period, when heritability and genotypic variance are highest, to capture high early CCS genotypes with acceptable cane yield for recycling in breeding activities. This protocol should enhance genetic gain for early CCS and simultaneously increase REV early in the harvesting period of the Australian sugar industry.
Keyword Early CCS
Indirect selection
Relative economic value
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
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