2024-03-28T08:48:26Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/975882021-12-27T15:33:46Zcom_10261_75com_10261_6col_10261_328
Effects of photo and thermo cycles on flowering time in barley: A genetical phenomics approach
Karsaï, Ildikó
Szücs, Péter
Kõszegi, Béla
Hayes, Patrick M.
Casas Cendoya, Ana María
Bedő, Zoltan
Veisz, Ottó B.
ZCCT-H
BM5A
HvPRR7
Hordeum vulgare
HvFT1
HvFT3
9 Pág., 3 Fig., 3 Tabl. The definitive version is available at: http://jxb.oxfordjournals.org/content/59/10/2707
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The effects of synchronous photo (16 h daylength) and thermo (2°C daily fluctuation) cycles on flowering time were compared with constant light and temperature treatments using two barley mapping populations derived from the facultative cultivar 'Dicktoo'. The 'Dicktoo'x'Morex' (spring) population (DM) segregates for functional differences in alleles of candidate genes for VRN-H1, VRN-H3, PPD-H1, and PPD-H2. The first two loci are associated with the vernalization response and the latter two with photoperiod sensitivity. The 'Dicktoo'x'Kompolti korai' (winter) population (DK) has a known functional polymorphism only at VRN-H2, a locus associated with vernalization sensitivity. Flowering time in both populations was accelerated when there was no fluctuating factor in the environment and was delayed to the greatest extent with the application of synchronous photo and thermo cycles. Alleles at VRN-H1, VRN-H2, PPD-H1, and PPD-H2 - and their interactions - were found to be significant determinants of the increase/decrease in days to flower. Under synchronous photo and thermo cycles, plants with the Dicktoo (recessive) VRN-H1 allele flowered significantly later than those with the Kompolti korai (recessive) or Morex (dominant) VRN-H1 alleles. The Dicktoo VRN-H1 allele, together with the late-flowering allele at PPD-H1 and PPD-H2, led to the greatest delay. The application of synchronous photo and thermo cycles changed the epistatic interaction between VRN-H2 and VRN-H1: plants with Dicktoo type VRN-H1 flowered late, regardless of the allele phase at VRN-H2. Our results are novel in demonstrating the large effects of minor variations in environmental signals on flowering time: for example, a 2°C thermo cycle caused a delay in flowering time of 70 d as compared to a constant temperature. © 2008 The Author(s).
The publication of the experimental results was funded by a Bolyai János Research Grant from the Hungarian Academy of Sciences and by the research grant (NK72913) of the National Scientific Research Fund (OTKA)
Peer Reviewed
2014-06-02T14:18:52Z
2014-06-02T14:18:52Z
2008-07
2014-06-02T14:18:52Z
artículo
http://purl.org/coar/resource_type/c_6501
doi: 10.1093/jxb/ern131
issn: 0022-0957
Journal of Experimental Botany 59 (10): 2707-2715 (2008)
http://hdl.handle.net/10261/97588
10.1093/jxb/ern131
18550600
Publisher’s version
http://dx.doi.org/10.1093/jxb/ern131
open
Oxford University Press