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dc.contributor.authorFerrante, Ariel
dc.contributor.authorSavin, Roxana
dc.contributor.authorSlafer, Gustavo A.
dc.description.abstractIn 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.ca_ES
dc.description.sponsorshipFunding was provided partly by WatNitMED, a project which received a grant from the European Union, FP6, INCO-MPC; and partly by AGL2006-07814, a project which received a grant from the Spanish Ministry of Science and Innovation. AF held an FPU scholarship from the Spanish Ministry of Science and Innovation.ca_ES
dc.publisherOxford Journalsca_ES
dc.relation.isformatofReproducció del document publicat a
dc.relation.ispartofJournal of Experimental Botany, 2010, vol. 61, núm. 15, p. 4351-4359ca_ES
dc.rightscc-by-nc (c) Ferrante et al, 2010ca_ES
dc.subjectFloret primordiaca_ES
dc.subjectGrain numberca_ES
dc.subjectTriticum durumca_ES
dc.titleFloret development of durum wheat in response to nitrogen availabilityca_ES

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cc-by-nc (c) Ferrante et al, 2010
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