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.
Browse
7 results
Search Results
Now showing 1 - 7 of 7
Item Effect of far-red radiation on flowering of Saccharum spp. hybrids : SRDC Final report BS1S(1990) Berding, N; Moore, PHMany 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.Item Assessment of bulk segregant analysis and marker- assisted selection for economically important traits in sugarcane : SRDC final report BS138(1998) Carroll, B; Berding, N; McIntyre, LThe main aim of this project was to assess the feasibility of bulk segregant analysis (BSA) and marker-assisted selection for important traits in sugarcane. The target trait for this feasibility study was rust resistance. Initially, crosses were successfully made between susceptible and resistant parents to produce two mapping populations. Unfortunately and surprisingly, we were not able to identify fully susceptible clones in four separate rust trials on the two populations. Poor rust development occurred in the first bench trial in 1996 at Meringa (including clones known to be susceptible), and the second trial in January 1997 was a total failure due to lack of rust development. The third rust resistance trial was conducted in Meringa in July 1997, but all of the clones in the mapping populations were resistant. The fourth rust trial on these two populations was completed at the start of 1998, and the results confirmed that all of the clones in these two initial mapping populations were resistant to common rust. Lack of segregation for rust resistance within progeny of sugarcane crosses had not been observed previously by sugarcane breeders in Meringa. This unexpected problem delayed the project as BSA could only proceed after a mapping population segregating for rust resistance had been identified.Item Effect of far-red radiation on flowering of Saccharum spp. Hybrids : SRDC final report BS1S(1990) Berding, N; Moore, PHMany tropical sugarcane clones (Saccharum spp. hybr ids) 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-ofday 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 (DI) 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, DI, 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 ei ther 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 Dr. 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.Item Optimum plot shape for variety trials - effect of competition between varieties : Final report 39905083(1991) Berding, N; Skinner, JCFour plot shapes were compared using four replications of 60 clones. The shapes were 4-row long (4L), 4-row short (4S), 2-row long (2L) and 1-row long (1L). The standard length of 9.2m was used for long plots, short plots being 4.6m. A special design was used to compare all plot shapes in sub-blocks of six clones, but it was analysed as randomised complete blocks. With guard rows and ends the trial occupied 3.7 ha. It was located on the farm of L Johnson in the Mulgrave mill area.Item Effect of far-red radiation on flowering of saccharum spp. hybrids(1990) Berding, N; Moore, PHMany 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 (DI) 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, DI, 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 DI treatments delayed emergence of flowering.Item 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, NProject objectives:Item An assessment of the application of DNA markers to studies of genetic diversity and marker assisted selection in sugarcane : SRDC Final report SD99001(1999) Carroll, B; McIntyre, L; Berding, NThe project objectives were as follows: