Floret development of durum wheat in response to nitrogen availability

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2010Suggested citation
Ferrante, Ariel;
Savin, Roxana;
Slafer, Gustavo A.;
.
(2010)
.
Floret development of durum wheat in response to nitrogen availability.
Journal of Experimental Botany, 2010, vol. 61, núm. 15, p. 4351-4359.
https://doi.org/10.1093/jxb/erq236.
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In Mediterranean durum wheat production, nitrogen (N) fertilization may be important to stabilize and increase
yields. Wheat yield responses to N fertilization are usually related to grains per m2, which in turn is the consequence
of processes related to floret development (floret initiation followed by floret death/survival) during stem elongation.
The literature is rather scarce in terms of the relevance of floret developmental dynamics, determining the final
number of grains in general terms and in particular regarding responsiveness to N. The aim of this study was to
determine whether durum wheat responses to N under different water regimes are related to the dynamics of
development of floret primordia to produce fertile florets. During the 2006–2007 and 2007–2008 growing seasons,
experiments with a factorial combination of two N levels (0 and 100 or 250 kg N ha21) and two levels of water
availability (rainfed and irrigated) were carried out (although the water regime was only effective in the second
season). The response of yield was largely a consequence of that in grain number per spike. Floret initiation was
similar for both N levels in each experiment and water regime, for which the survival of a higher proportion of
initiated florets was critical in the response of the crop. The diminished rate of floret abortion during the late part of
stem elongation in response to N was associated with a slightly accelerated rate of floret development which
allowed a higher proportion of the primordia initiated to reach the stage of fertile floret by flowering.
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Journal of Experimental Botany, 2010, vol. 61, núm. 15, p. 4351-4359European research projects
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