Show simple item record

dc.contributor.authorPérez-Gianmarco, Thomas I.
dc.contributor.authorSlafer, Gustavo A.
dc.contributor.authorGonzález, Fernanda G.
dc.description.abstractLengthening the pre-anthesis period of stem elongation (or late-reproductive phase, LRP) through altering photoperiod sensitivity has been suggested as a potential means to increase the number of fertile florets at anthesis (NFF) in wheat. However, little is known about the effects that the Ppd-1 genes modulating plant response to photoperiod may have on reproductive development. Here, five genotypes with either sensitive (b) or insensitive (a) alleles were grown in chambers under contrasting photoperiods (12 h or 16 h) to assess their effects. The genotypes consisted of the control cultivar Paragon (three Ppd-1b) and four near-isogenic lines of Paragon with Ppd-1a alleles introgressed from: Chinese Spring (Ppd-B1a), GS-100 (Ppd-A1a), Sonora 64 (Ppd-D1a), and Triple Insensitive (three Ppd-1a). Under a 12-h photoperiod, NFF in the genotypes followed the order three Ppd-1b > Ppd-B1a > Ppd-A1a > Ppd-D1a > three Ppd-1a. Under a 16-h photoperiod the differences were milder, but three Ppd-1b still had a greater NFF than the rest. As Ppd-1a alleles shortened the LRP, spikes were lighter and the NFF decreased. The results demonstrated for the first time that Ppd-1a decreases the maximum number of florets initiated through shortening the floret initiation phase, and this partially explained the variations in NFF. The most important impact of Ppd-1a alleles, however, was related to a reduction in survival of floret primordia, which resulted in the lower NFF. These findings reinforce the idea that an increased duration of the LRP, achieved through photoperiod sensitivity, would be useful for increasing wheat yield potential.ca_ES
dc.description.sponsorshipWe thank Simon Griffiths for providing the seeds of the NILs used in this study within the framework of the EU-FP7 project ADAPTAWHEAT (project number 289842), which also supported the experimental work. TIP-G held a doctoral fellowship from CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), and thanks the Crop Physiology Lab of the UdL for providing living allowances while conducting the experiments.ca_ES
dc.publisherOxford University Pressca_ES
dc.relation.isformatofReproducció del document publicat a
dc.relation.ispartofJournal of Experimental Botany, 2019, vol. 70, núm. 4, p. 1339–1348ca_ES
dc.rightscc-by, (c) Pérez-Gianmarco et al., 2019ca_ES
dc.subjectFloret developmentca_ES
dc.subjectFloret survivalca_ES
dc.subjectPhotoperiod sensitivityca_ES
dc.titlePhotoperiod-sensitivity genes shape floret development in wheatca_ES

Files in this item


This item appears in the following Collection(s)

Show simple item record

cc-by, (c) Pérez-Gianmarco et al., 2019
Except where otherwise noted, this item's license is described as cc-by, (c) Pérez-Gianmarco et al., 2019