More fertile florets and grains per spike can be achieved at higher temperature in wheat lines with high spike biomass and sugar content at booting

Dreccer, M. Fernanda, Wockner, Kimberley B., Palta, Jairo A., McIntyre, C. Lynne, Borgognone, M. Gabriela, Bourgault, Maryse, Reynolds, Matthew and Miralles, Daniel J. (2014) More fertile florets and grains per spike can be achieved at higher temperature in wheat lines with high spike biomass and sugar content at booting. Functional Plant Biology, 41 5: 482-495. doi:10.1071/FP13232


Author Dreccer, M. Fernanda
Wockner, Kimberley B.
Palta, Jairo A.
McIntyre, C. Lynne
Borgognone, M. Gabriela
Bourgault, Maryse
Reynolds, Matthew
Miralles, Daniel J.
Title More fertile florets and grains per spike can be achieved at higher temperature in wheat lines with high spike biomass and sugar content at booting
Journal name Functional Plant Biology   Check publisher's open access policy
ISSN 1445-4408
1445-4416
Publication date 2014
Year available 2014
Sub-type Article (original research)
DOI 10.1071/FP13232
Open Access Status DOI
Volume 41
Issue 5
Start page 482
End page 495
Total pages 14
Place of publication Clayton VIC, Australia
Publisher CSIRO
Collection year 2015
Language eng
Abstract An understanding of processes regulating wheat floret and grain number at higher temperatures is required to better exploit genetic variation. In this study we tested the hypothesis that at higher temperatures, a reduction in floret fertility is associated with a decrease in soluble sugars and this response is exacerbated in genotypes low in water soluble carbohydrates (WSC). Four recombinant inbred lines contrasting for stem WSC were grown at 20/10 °C and 11h photoperiod until terminal spikelet, and then continued in a factorial combination of 20/10°C or 28/14 °C with 11h or 16h photoperiod until anthesis. Across environments, High WSC lines had more grains per spike associated with more florets per spike. The number of fertile florets was associated with spike biomass at booting and, by extension, with glucose amount, both higher in High WSC lines. At booting, High WSC lines had higher fixed 13C and higher levels of expression of genes involved in photosynthesis and sucrose transport and lower in sucrose degradation compared with Low WSC lines. At higher temperature, the intrinsic rate of floret development rate before booting was slower in High WSC lines. Grain set declined with the intrinsic rate of floret development before booting, with an advantage for High WSC lines at 28/14°C and 16h. Genotypic and environmental action on floret fertility and grain set was summarised in a model.
Keyword Floret
Grain number
Photoperiod
Water soluble carbohydrates.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2015 Collection
 
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