Varieties, plant breeding and release

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Effect of far-red radiation on flowering of Saccharum spp. hybrids : SRDC Final report BS1S
(1990) Berding, N; Moore, PH
Many tropical sugarcane clones (Saccharum spp. hybrids) are unavailable for hybridization because of poor flowering. Methods are required to improve the flowering of such clones. This study was conducted to determine whether far-red radiation (> 700 nm) at end-of day would improve flowering. Three treatments in a photoperiod facility (PPF) were compared to an external control (EC) under natural photoperiod. A basic treatment known as modified Florida (MF) was used in all PPF treatments and served as the internal control. This was altered to provide a far-red (FR) treatment, by addition of either 5 or 10 min of far-red radiation at end-of-day, and a day interrupt (Dr) treatment, by imposition of 2 hr of darkness in mid afternoon. Percent flowering as harvested panicles was 21.0, 24.2, 24.6, and 9.5 for FR, Dr, MF, and EC, respectively. Total flowering was 23.4, 28.9, 27.0, and 10.7, respectively. The PPF treatments did not differ significantly for either measure. All were highly significantly greater than EC. The far-red treatments did not differ for harvested panicles. Treatments differed significantly for time of flowering. The flowering sequence was EC, MF, FR, and then DI. There were significant differences among clones in all treatments for emergence day, initiation day, elapsed days, and pollen test. Correlations among these measures were varied, with some being significant. Far red at end-of-day neither stimulated nor inhibited flowering in the PPF treatments. The FR and Dr treatments delayed emergence of flowering.
Optimal plot size and replication for testing clones in early stages of selection : SRDC final report CSR017
(1998) Jackson, P; McRae, TA
The aim of CSRO 17 was to identifY optimal plot design, replication and selection criteria for testing and selecting clones in small plots in early stages of selection in sugarcane breeding programs. Problems associated with the use of small plots are well known in field experimentation. This is particularly so in variety selection trials where measurements in small plots are subject to possible bias due to competition effects when there are significant differences in height between genotypes being compared. In sugarcane breeding programs, small, single row or two row plots are usually used extensively for the first two stages of selection within seedling populations. The reasons for this include the desire to screen large populations of clones within available resource constraints to identifY rare, elite recombinants, and the necessity to bulk up planting material from original seedlings before planting to larger plots. Given the level of resources usually devoted to early stage selection trials, it is important that optimal procedures are used so that selection is effective and efficient. The overall approach used in the project was to obtain estimates of key genetic parameters from field experimentation and then to use these to predict gains from selection among relatively unselected clonal populations in sugarcane breeding programs using different selection options. The clones used in this study were representative of those directly derived from hybridisation in two different sugarcane breeding programs, and were unbiased by any previous selection. As such, the genetic parameters are useful for other studies that may simulate and assess different options for selection from the first stages of selection in sugarcane breeding programs.
Introgression of erianthus germplasm into the saccharum gene pool & Investigation of the saccharum spontaneum contribution to commercial clones by genomic DNA In SITU hybridisation : SRDC Final reports BS115 & BS139
(1999) Piperidis, G; D'Hont, A; Berding, N
Project objectives:
Genotype X environment interaction for clones and crosses planted in Southern Queensland and Northern New South Wales : SRDC final report BS15S
(1997) Bull, JK
The main aims of this project were to assess whether original seedling families produced for south Queensland would be suitable for the New South Wales sugar industry and to determine whether clones selected at the Bundaberg Sugar Experiment Station would perform similarly under northern New South Wales cropping conditions.
Seasonal distribution of growth and sugar accumulation in sugarcane : SRDC project BS5S Final report
(1995) Cox, MC
At existing levels of cane yield, an extra unit of sugar content during May, June and July represented 47 6000 tonnes of sugar worth $13.3m at 1987 prices when this project was initiated. The situation now, with annual crops of greater than 30m tonnes and higher sugar prices, would provide greater returns. The potential for increasing early sugar through breeding and selectio has been demonstrated (see BS25S Final Report). Selection for high early sugar content may change the seasonal pattern of yield accumulation and affect regional adaptation.
Genotype X environment interaction and selection of sugarcane families for the Burdekin River irrigation area : SRDC final report BS57S
(1995) McRae, TA; Jackson, PA
The arable lands being developed for sugarcane production in the Burdekin River Irrigation Area (BRIA) are on markedly different soil types and, as a consequence, may present environmental challenges different to those influencing sugarcane production on the more established alluvial soils of the Burdekin delta and levee areas.

Varieties, plant breeding and release

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