Abstract
The development of winter wheats suitable for early sowing in the semi-arid Mediterranean environments of southern Australia can potentially increase water-limited potential yield despite decreasing autumn rainfall. Early-sown winter wheats generally have higher biomass than later-sown spring wheats. However, this increased biomass does not always translate to greater yield in comparison to spring wheats, as winter wheats often have lower harvest index. This study aimed to determine whether yield physiology differs in winter and
spring wheats with concurrent flowering times. We hypothesised that the partitioning traits harvest index and fruiting efficiency would be more closely related to yield in winter wheats than in spring wheats. Inbred lines derived from a Mace/Gauntlet cross, incorporating 42 winter- and 24 spring- types were sown in a partially-replicated field experiment at Narraport, VIC in 2018. Vegetative and reproductive growth rate, heading date, harvest dry matter, yield, yield components, harvest index and fruiting efficiency were measured. There
was a wide range of heading dates, particularly for the winter lines, suggesting that minor development genes or genetic variation not captured by molecular markers have a significant role in development rate. There was no difference in the relationship between phenotypic traits and yield for winter wheat lines compared to spring wheat lines. Harvest dry matter and grain number explained the largest amount of variation in grain yield, whilst harvest index and fruiting efficiency were both weakly associated with yield. This study will be
repeated with lines matched for flowering time and with a greater level of replication in 2019.
spring wheats with concurrent flowering times. We hypothesised that the partitioning traits harvest index and fruiting efficiency would be more closely related to yield in winter wheats than in spring wheats. Inbred lines derived from a Mace/Gauntlet cross, incorporating 42 winter- and 24 spring- types were sown in a partially-replicated field experiment at Narraport, VIC in 2018. Vegetative and reproductive growth rate, heading date, harvest dry matter, yield, yield components, harvest index and fruiting efficiency were measured. There
was a wide range of heading dates, particularly for the winter lines, suggesting that minor development genes or genetic variation not captured by molecular markers have a significant role in development rate. There was no difference in the relationship between phenotypic traits and yield for winter wheat lines compared to spring wheat lines. Harvest dry matter and grain number explained the largest amount of variation in grain yield, whilst harvest index and fruiting efficiency were both weakly associated with yield. This study will be
repeated with lines matched for flowering time and with a greater level of replication in 2019.
| Original language | English |
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| Title of host publication | Proceedings of the 2019 Agronomy Australia Conference |
| Publisher | Australian Society of Agronomy |
| Pages | 1-4 |
| Number of pages | 4 |
| Publication status | Published - 2019 |
| Event | 19th Australian Agronomy Conference 2019 - Wagga Wagga Civic Theatre, Wagga Wagga, Australia Duration: 25 Aug 2019 → 29 Aug 2019 https://web.archive.org/web/20190122040437/http://agronomyconference.com/ (Conference website) https://web.archive.org/web/20190625230032/http://www.agronomyconference.com/program (Conference program) |
Publication series
| Name | 19th Australian Society of Agronomy Conference, 25-29 August 2019, Wagga Wagga, NSW, Australia |
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Conference
| Conference | 19th Australian Agronomy Conference 2019 |
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| Abbreviated title | Cells to Satellites |
| Country/Territory | Australia |
| City | Wagga Wagga |
| Period | 25/08/19 → 29/08/19 |
| Other | The 19th Australian Agronomy Conference will be held in Wagga Wagga, NSW from 25 – 29 August 2019. In the heart of the Riverina, Wagga Wagga has a range of rural industries across the region. Wagga has everything to offer the agronomy conference being surrounded by a mixed farming zone with irrigation to the west and permanent pasture enterprises to the east. The conference theme Cells to satellites highlights the integrative nature of agronomy. Each of us work across a range of disciplines to optimise crop or pasture production for productivity and profitability. We have an increasing number of tools available to increase the precision and accuracy of our work; whether it is at the “cellular” level where DNA is mapped and biochemistry is unravelled or using “satellites” for remote sensing or guidance. The opportunities for enhancing our agronomy research is boundless. |
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