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Type: Journal article
Title: Floret development and grain setting differences between modern durum wheats under contrasting nitrogen availability
Author: Ferrante, A.
Savin, R.
Slafer, G.
Citation: Journal of Experimental Botany, 2013; 64(1):169-184
Publisher: Oxford University Press
Issue Date: 2013
ISSN: 0022-0957
Statement of
Ariel Ferrante, Roxana Savin and Gustavo A. Slafer
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.
Keywords: Detillering; fertile floret; floret primordia; grain number; grain set; Triticum durum
Rights: © 2012 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
RMID: 0030064438
DOI: 10.1093/jxb/ers320
Appears in Collections:Agriculture, Food and Wine publications

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