Varieties, plant breeding and release

Permanent URI for this collectionhttp://elibrary2.sugarresearch.com.au/handle/11079/13841

Research outcomes: Comprehensive and efficient variety breeding, selection and release programs responding to yield expectations, environmental constraints, resource scarcity and regional preferences. Faster varietal adoption using advanced methods for bulking, distribution and planting.

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1999 - 199912000 - 20042

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Author: search.filters.author.Bull, TASubject: search.filters.subject.Plant breeding

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    The environmental basis for clone by environment interaction : SRDC final report BSS76
    (2004) Bull, JK; Bull, TA; Cooper, M
    This project attempted to identify environmental factors responsible for genotype-by-environment (GXE) interaction by monitoring environmental parameters and relating these to growth responses of test clones. It also sought to identify a set of probe genotypes to use in clonal assessment trials to assist in the assessment of the performance of test clones when presented with specific environmental challenges.
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    GxE interactions on ratooning of genotypes under trash blankets under cool/wet conditions : SRDC final report BS169S
    (2000) Bull, TA
    This project was established to investigate the magnitude of the genotype by environment interaction effect for ratooning under a trash blanketing under cool/wet conditions. A population of 50 genotypes was deemed necessary for this study but was not manageable in a fully replicated agronomic trial. Hence, it was necessary to assess a population of 50 genotypes and select a representative sub-population of 25. Accordingly fifty genotypes (40 unselected genotypes and 10 cultivars) were planted in the field at Bundaberg BSES station at fortnightly intervals from February to August 1997. Measurements of shoot emergence, stalk elongation and leaf appearance from each planting date were used to calculate base temperatures and thermal times for each parameter for each genotype. Plots of base temperature against thermal time were used to display the range of variation present in the population and to select a sub-population of 25 genotypes (21 genotypes and 4 cultivars) that represented this range. Population means and standard deviations for the selected 25 genotypes were not significantly different from those for the original 50 genotypes.
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    Genotype selection and management strategies for exploitation of responses to high planting densities : SRDC final report BS137S
    (1999) Bull, JK; Bull, TA
    The objectives of this project were to: evaluate the potential for high density planting (close row spacings) to increase yields over a range of conditions; assess the genetic potential available to exploit higher planting density in the current breeding population; examine alternate row spacing strategies suited to grower farming systems and constraints (including irrigated and dry land); assess the potential ratoon yields from close row crops (by hand harvesting); encourage grower interest and participation in longer term activities to develop procedures and equipment to support close row management systems; analyse the economic cost/benefit from adopting higher planting density.