Earliness per se effects on developmental traits in hexaploid wheat grown under field conditions

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

doi:10.1016/j.eja.2018.07.007

Cited by 18 publications

(28 citation statements)

References 53 publications

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“…Eps-7D and Eps-7D × temperature interaction. In line with the previous knowledge about other known Eps genes, the Eps-7D studied here also had subtle through consistent and significant effects on time to anthesis (Ochagavía et al, 2018b(Ochagavía et al, , 2019Zikhali et al, 2014). This is not surprising as even though each Eps gene would have different mechanisms of action, by definition they all result in relatively small differences in time to anthesis or heading (Griffiths et al, 2009;Zikhali et al, 2014) to the degree that many times may be undetectable if photoperiod and vernalisation requirements are not fully satisfied (Zikhali et al, 2014).…”

Section: Discussionsupporting

confidence: 87%

“…Then, major changes in anthesis time may not be as relevant as fine adjustments. The importance of Eps genes may be even higher than that of the major Vrn and Ppd sensitivity genes when the need is to fine adjust phenology because they normally have a relatively small effect (Bullrich et al, 2002;Griffiths et al, 2009;Lewis et al, 2008;Ochagavía et al, 2018b). Indeed, due to their relatively subtle effect, Eps genes may have gone undetected during the course of selection (Zikhali et al, 2014), and are mostly identified as QTLs (Zikhali et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Wheat developmental traits as affected by the interaction betweenEps-7Dand temperature under contrasting photoperiods with insensitivePpd-D1background

Basavaraddi

Savin

Griffiths

et al. 2020

Preprint

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Earliness per se (Eps) genes are important to fine tune adaptation, and studying their probable pleiotropic effect on wheat yield traits is worthwhile. In addition, it has been shown that some Eps genes interact with temperature. We studied two NILs differing in the newly identified Eps-7D but carrying insensitive Ppd-D1 in the background under three temperature regimes (9, 15 and 18 °C) and two photoperiods (12 h and 24 h). Eps-7D affected time to anthesis as expected and the Eps-7D-late allele extended both the period before and after terminal spikelet. The interaction effect of Eps-7D × temperature was significant but not cross-over: the magnitude and level of significance of the difference between NILs with the late or early allele was affected by the growing temperature (i.e. difference was least at 18 °C and largest at 9 °C), and differences in temperature sensitivity was influenced by photoperiod. Rate of leaf initiation was faster in NIL with Eps-7D-early than with the late allele which compensated for the shorter duration of leaf initiation resulting in similar final leaf number between two NILs. Eps-7D-late consistently increased spike fertility through improving floret primordia survival as a consequence of extending the late reproductive phase.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Wheat developmental traits as affected by the interaction betweenEps-7Dand temperature under contrasting photoperiods with insensitivePpd-D1background

Basavaraddi

Savin

Griffiths

et al. 2020

Preprint

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“…Our study provides the first time proof for the interaction between two Eps in particular which was only speculated before 38 . Our observations in addition to that of other researcher 35 Further, both Eps-7D and 2B affected the number of primordia initiated and the differences in the primordia was mainly contributed from spikelet primordia as the differences in FLN between late and early alleles of both the QTLs were rather small. And the differences in the primordia were mainly due to the differences in the duration of primordia initiation as there was no alteration in the plastochron.…”

Section: Discussionsupporting

confidence: 71%

Interactions between two QTLs for time to anthesis on spike development and fertility in wheat

Basavaraddi

Savin

Wingen

et al. 2020

Preprint

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Earliness per se (Eps) genes are reported to be important in fine-tuning flowering time in wheat independently of photoperiod (Ppd) and vernalisation (Vrn). Unlike Ppd and Vrn genes, Eps have relatively small effects and their physiological effect along with chromosomal position are not well defined. We evaluated eight lines derived from crossing Paragon and Baj (late and early flowering respectively), vernalisation insensitive, to study the detailed effects of two newly identified QTLs, Eps-7D and Eps-2B and their interactions under field conditions. The effect of both QTLs were minor but their effect was modulated by the allelic status of the other. While the magnitude of effect of these QTLs on anthesis was similar, they are associated with very different profiles of pre-anthesis development which also depends on their interaction. Eps-7D affected both duration before and after terminal spikelet while not affecting final leaf number (FLN) so Eps-7D-early had a faster rate of leaf appearance. Eps-2B acted more specifically in the early reproductive phase and slightly altered FLN without affecting the leaf appearance rate. Both Eps-7D and 2B affected the spike fertility by altering the rate of floret development and mortality. The effect of the latter was very small but consistent in that the -late allele tended to produced more fertile florets.

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“…This is not to say that the fine tuning of phenology does not play an important role in the maximisation of NUE. Within genotypes that are equally well adapted improvements in NUE can be achieved by fine tuning phenological patterns such as the rate of floret abortion [49].…”

Section: The Impact Of Phenology On Meaningful Gene Discoverymentioning

confidence: 99%

Exploiting genetic variation in nitrogen use efficiency for cereal crop improvement

Hawkesford

Griffiths

2019

Current Opinion in Plant Biology

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113

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Highlights A statement on the critical importance of this area of plant science in terms of food security and sustainability. An outline of the critical NUE processes and example studies of identified variation in the complex trait of nitrogen use efficiency. Reference to number of critical single key genes/alleles which have major impacts on NUE. A description of the most useful genetic approaches being utilised to breed for NUE in cereals. Future prospects on the most important areas and approaches likely to have impact.

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Earliness per se effects on developmental traits in hexaploid wheat grown under field conditions

Cited by 18 publications

References 53 publications

Wheat developmental traits as affected by the interaction betweenEps-7Dand temperature under contrasting photoperiods with insensitivePpd-D1background

Wheat developmental traits as affected by the interaction betweenEps-7Dand temperature under contrasting photoperiods with insensitivePpd-D1background

Interactions between two QTLs for time to anthesis on spike development and fertility in wheat

Exploiting genetic variation in nitrogen use efficiency for cereal crop improvement

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