Earliness per se by temperature interaction on wheat development
Ochagavía Orbegozo, Helga
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Differences in time to heading that remain after photoperiod and vernalisation requirements have been saturated are classified as earliness per se (Eps) effects. It has been commonly assumed that Eps genes are purely constitutive and independent of environment, although the likely effect of temperature on Eps effects in hexaploid wheat has never been tested. We grew four near isogenic lines (NILs) for the Eps gene located in chromosome 1D (Eps-D1) at 6, 9, 12, 15, 18, 21 and 24 °C. In line with expectations we found that lines carrying the Eps-late allele were always later than those with Eps-early alleles. But in addition, we reported for the first time that the magnitude of the effect increased with decreasing temperature: an Eps x temperature interaction in hexaploid wheat. Variation in heading time due to Eps x temperature was associated with an increase in sensitivity to temperature mainly during late reproductive phase. Moreover, we showed that Eps alleles exhibited differences in cardinal (base, optimum, maximum) temperatures and that the expression of ELF3, (the likely candidate for Eps-D1) also interacted with temperature.
Is part ofScientific Reports, 2019, vol. 9, núm. 2584, p. 1-11
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Earliness per se x temperature interaction consequences on leaf, spikelet and floret development in wheat Prieto, Paula; Ochagavía Orbegozo, Helga; Griffiths, Simon; Slafer, Gustavo A. (Oxford University Press, 2019-12-26)Wheat adaptation can be fine-tuned by Eps genes. Although the effects of Eps genes are often assumed to act independently of the environment, previous studies have shown they exhibit temperature-sensitivity. Number of ...
Duration of developmental phases, and dynamics of leaf appearance and tillering, as affected by source and doses of photoperiod insensitivity alleles in wheat under field conditions Ochagavía Orbegozo, Helga; Prieto, Paula; Savin, Roxana; Griffiths, Simon; Slafer, Gustavo A. (Elsevier, 2017)Variation in photoperiod sensitivity in wheat plays a major role in the crop adaptation to wide agronomic environments. Photoperiod insensitivity is provided by Ppd-Aa, Ppd-B1a and Ppd-D1a alleles. Effects of the genome, ...
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. (Oxford University Press, 2018)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 ...