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Photoperiod during stem elongation in wheat: is its impact on fertile floret and grain number determination similar to that of radiation?

Published on Jan 1, 2005in Functional Plant Biology2.33
· DOI :10.1071/FP04103
Fernanda G. González14
Estimated H-index: 14
(UBA: University of Buenos Aires),
Gustavo A. Slafer58
Estimated H-index: 58
(University of Lleida),
Daniel J. Miralles31
Estimated H-index: 31
(UBA: University of Buenos Aires)
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Abstract
Increasing duration of stem elongation by exposure to short photoperiod would result in higher spike dry weight at anthesis, which is positively associated with the number of fertile florets and grains in wheat. However, it is not easy to determine whether photoperiod effects on fertile florets and grains are only mediated by assimilate supply to the growing spike when spike weight variation is attained only with photoperiod treatments. The aim of this study was to determine whether photoperiod effects on number of fertile florets and grains may be direct, that is, not mediated by assimilate supply, by comparing the magnitude of photoperiod effects with those of shading the canopy. Spike dry weight at anthesis was changed through the factorial combination of different photoperiod (natural and 6 h extended photoperiod) and shading (un-shaded and 67 ± 3% shaded) treatments during stem elongation of Buck Manantial, a cultivar known for its photoperiod sensitivity in this phase. Both treatments modified spike dry weight at anthesis and the number of fertile florets and grains, independently. When duration of stem elongation was lengthened by exposure to natural photoperiod and when incident radiation was high, spike dry weight at anthesis increased by 33% (NP+0 v. NP+6) and 27% (un-shaded v. shaded), respectively. The number of fertile florets increased similarly to spike dry weight (34% NP+0 v. NP+6 and 28% un-shaded v. shaded) resulting in higher number of grains. Most photoperiod effects on the number of fertile florets and, consequently, on the number of grains, were mediated by assimilate supply to the growing spike as the same relationship between the number of fertile florets and spike dry weight at anthesis was observed for photoperiod and shading treatments (R2 = 0.99, P<0.05).
  • References (33)
  • Citations (51)
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References33
Newest
#1Fernanda G. González (UBA: University of Buenos Aires)H-Index: 14
#2Gustavo A. Slafer (UBA: University of Buenos Aires)H-Index: 58
Last.Daniel J. Miralles (UBA: University of Buenos Aires)H-Index: 31
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#1D. J. Miralles (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 1
#2R. A. Richards (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 52
#1D. Rodriguez (UBA: University of Buenos Aires)H-Index: 27
#2Fernando H. Andrade (INTA: International Trademark Association)H-Index: 45
Last.J. GoudriaanH-Index: 8
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#1P. E. AbbateH-Index: 13
#2Fernando H. AndradeH-Index: 45
Last.P.S. Bindraban (CIMMYT: International Maize and Wheat Improvement Center)H-Index: 1
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Cited By51
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#1Zhigan Zhao (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 1
#2Greg J. Rebetzke (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 31
Last.Enli Wang (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 35
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#1Yuangang Zhu (SDAU: Shandong Agricultural University)
#2Jinpeng Chu (SDAU: Shandong Agricultural University)H-Index: 1
Last.Mingrong He (SDAU: Shandong Agricultural University)H-Index: 5
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#1Helga Ochagavía (University of Lleida)H-Index: 3
#2Paula Prieto (University of Lleida)H-Index: 3
Last.Gustavo A. Slafer (University of Lleida)H-Index: 58
view all 5 authors...
#1Zifeng Guo (Leibniz Association)H-Index: 4
#2Dijun Chen (Leibniz Association)H-Index: 19
Last.Thorsten Schnurbusch (MLU: Martin Luther University of Halle-Wittenberg)H-Index: 25
view all 5 authors...
#1Zifeng Guo (Leibniz Association)H-Index: 4
#2Dijun Chen (Leibniz Association)H-Index: 19
Last.Thorsten Schnurbusch (Leibniz Association)H-Index: 25
view all 3 authors...
#1Eduardo Beche (MU: University of Missouri)
#2Cristiano Lemes da Silva (KSU: Kansas State University)H-Index: 8
Last.José Abramo Marchese (UTFPR: Federal University of Technology - Paraná)H-Index: 9
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