2026-04-17T00:48:10Zhttps://recercat.cat/oai/requestoai:recercat.cat:10459.1/634182024-12-05T21:31:53Zcom_2072_3622col_2072_479130
RECERCAT
author
Ochagavía Orbegozo, Helga
author
Prieto, Paula
author
Savin, Roxana
author
Griffiths, Simon
author
Slafer, Gustavo A.
2024-12-05T21:31:53Z
2024-12-05T21:31:53Z
2018-05-23T07:29:16Z2018-05-23T07:29:16Z20182018-05-23T07:29:18Z
http://hdl.handle.net/10459.1/63418
Wheat adaptation is affected by
Ppd
genes, but the role of these alleles in the rates of leaf and spikelet initiation has
not been properly analysed. Twelve near isogenic lines (NILs) combining
Ppd-1a
alleles from different donors intro-
gressed in A, B, and/or D genomes were tested under field conditions during two growing seasons together with the
wild type, Paragon. Leaf initiation rate was unaffected by
Ppd-1a
alleles so the final leaf number (FLN) was reduced
in parallel with reductions in the duration of the vegetative phase. Spikelet primordia initiation was accelerated and
consequently the effect on spikelets per spike was less than proportional to the effect on the duration of spikelet ini-
tiation. The magnitude of these effects on spikelet plastochron depended on the doses of
Ppd-1
homoeoalleles and
the specific insensitivity alleles carried. Double ridge was consistently later than floral initiation, but the difference
between them was not affected by
Ppd-1a
alleles. These findings have potential for selecting the best combinations
from the
Ppd-1
homoeoallelic series for manipulating adaptation taking into consideration particular effects on spike-
let number.Funding was provided by ADAPTAWHEAT (a project funded by the
European Commission under the 7th Framework Programme for
Research and Technological Development) and by project AGL2012-
35300 funded by the Ministry of Economy and Competitiveness
of Spain. HO held a FPI scholarship from the Spanish Ministry of
Science and Innovation, and PP held a PhD scholarship from the
University of Lleida. We thank Andreu Casellas for excellent technical
assistance and Ignacio Romagosa for valuable advice on the statistical
procedures.
cc-by (c) Ochagavía et al., 2018 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/
Double ridge
Flowering time
Plastochron
Ppd genes
Triticum aestivum
Dynamics of leaf and spikelet primordia initiation in wheat as affected by Ppd-1a alleles under field conditions
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion