Floret development of durum wheat in response to nitrogen availability

Ferrante, Ariel, Savin, Roxana and Slafer, Gustavo A. (2010) Floret development of durum wheat in response to nitrogen availability. Journal of Experimental Botany, 61 15: 4351-4359. doi:10.1093/jxb/erq236


Author Ferrante, Ariel
Savin, Roxana
Slafer, Gustavo A.
Title Floret development of durum wheat in response to nitrogen availability
Journal name Journal of Experimental Botany   Check publisher's open access policy
ISSN 0022-0957
1460-2431
Publication date 2010-08-08
Year available 2010
Sub-type Article (original research)
DOI 10.1093/jxb/erq236
Open Access Status DOI
Volume 61
Issue 15
Start page 4351
End page 4359
Total pages 9
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Formatted abstract
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 250kg N ha-1) 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.
Keyword Floret primordia
Grain number
Triticum durum
Yield
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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