Floret development and grain setting differences between modern durum wheats under contrasting nitrogen availability

Ferrante, Ariel, Savin, Roxana and Slafer, Gustavo A. (2013) Floret development and grain setting differences between modern durum wheats under contrasting nitrogen availability. Journal of Experimental Botany, 64 1: 169-184. doi:10.1093/jxb/ers320


Author Ferrante, Ariel
Savin, Roxana
Slafer, Gustavo A.
Title Floret development and grain setting differences between modern durum wheats under contrasting nitrogen availability
Journal name Journal of Experimental Botany   Check publisher's open access policy
ISSN 0022-0957
1460-2431
Publication date 2013-01
Sub-type Article (original research)
DOI 10.1093/jxb/ers320
Open Access Status Not Open Access
Volume 64
Issue 1
Start page 169
End page 184
Total pages 16
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Formatted abstract
Wheat yield depends on the number of grains per square metre, which in turn is related to the number of fertile florets at anthesis. The dynamics of floret generation/degeneration were studied in contrasting conditions of nitrogen (N) and water availability of modern, well-adapted, durum wheats in order to understand further the bases for grain number determination. Experiments were carried out during the 2008-2009 and 2009-2010 growing seasons at Lleida (NE Spain). The first experiment involved four cultivars (Claudio, Donduro, Simeto, and Vitron) and two contrasting N availabilities (50 kgN ha-1 and 250 kgN ha-1; N50 and N250) while experiment 2 included the two cultivars most contrasting in grain setting responsiveness to N in experiment 1, and two levels of N (N50 and N250), under irrigated (IR) and rainfed (RF) conditions. In addition, a detillering treatment was imposed on both cultivars under the IR+N250 condition. The number of fertile florets at anthesis was increased by ~30% in response to N fertilization (averaging across treatments and spikelet positions). The effect of N and water availability was evident on floret developmental rates from the third floret primordium onwards, as these florets in the central spikelets of all genotypes reached the stage of a fertile floret in N250 while in N50 they did not. In this study, clear differences were found between the cultivars in their responsiveness to N by producing more fertile florets at anthesis (through accelerating developmental rates of floret primordia), by increasing the likelihood of particular grains to be set, or by both traits.
Keyword Detillering
Fertile floret
Floret primordia
Grain number
Grain set
Triticum durum
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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Created: Tue, 23 Feb 2016, 16:35:15 EST by Anthony Yeates on behalf of Centre for Plant Science