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

Ochagavía Orbegozo, Helga; Prieto, Paula; Savin, Roxana; Griffiths, Simon; Slafer, Gustavo A.

doi:https://doi.org/10.1093/jxb/ery104

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Issue date

2018

Author

Ochagavía Orbegozo, Helga

Prieto, Paula

Savin, Roxana

Griffiths, Simon

Slafer, Gustavo A.

Suggested 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.

Abstract

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.

URI

http://hdl.handle.net/10459.1/63418

DOI

https://doi.org/10.1093/jxb/ery104

Is part of

Journal of Experimental Botany, 2018, vol. 69, núm. 10, p. 2621-2631

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