Dynamics of leaf and spikelet primordia initiation in wheat as affected by Ppd-1a alleles under field conditions

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2018Suggested citation
Ochagavía Orbegozo, Helga;
Prieto, Paula;
Savin, Roxana;
Griffiths, Simon;
Slafer, Gustavo A.;
.
(2018)
.
Dynamics of leaf and spikelet primordia initiation in wheat as affected by Ppd-1a alleles under field conditions.
Journal of Experimental Botany, 2018, vol. 69, núm. 10, p. 2621-2631.
https://doi.org/10.1093/jxb/ery104.
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Show full item recordAbstract
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.
Is part of
Journal of Experimental Botany, 2018, vol. 69, núm. 10, p. 2621-2631European research projects
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