TY - JOUR
T1 - Process-based analysis of Thinopyrum intermedium phenological development highlights the importance of dual induction for reproductive growth and agronomic performance
AU - Duchene, Olivier
AU - Dumont, Benjamin
AU - Cattani, Douglas J.
AU - Fagnant, Laura
AU - Schlautman, Brandon
AU - DeHaan, Lee R.
AU - Barriball, Spencer
AU - Jungers, Jacob M.
AU - Picasso, Valentin D.
AU - David, Christophe
AU - Celette, Florian
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/5/15
Y1 - 2021/5/15
N2 - Intermediate wheatgrass (Thinopyrum intermedium (Host) Barkworth & D.R. Dewey) is being developed for use as a new perennial grain crop through breeding and agronomic research. However, progress has been hampered by lack of understanding of environmental requirements for flowering and grain production. Therefore, we developed a phenology model for IWG adapted from the STICS soil-crop model. The model was compliant with experimental results (relative root mean square error = 0.03). The optimal vernalizing temperature was between 4 and 5°C, optimal daylength between 13 and 14h, while daylength below 11h slowed reproductive development. Vernalization requirement was found to be a constraining inductive process. Including a photoperiod limitation to the model with temperature improved its ability to predict induction at various latitudes. Therefore, timing and duration of vegetative vs. reproductive growth may differ between environments and change reproductive tiller elongation earliness, weed competitiveness, management timing, and stress conditions during phases critical to grain yield. Accurate phenology models will enable optimal field management and inform future breeding strategies. However, plasticity may lead to divergent ideotypes under various agroecosystems.
AB - Intermediate wheatgrass (Thinopyrum intermedium (Host) Barkworth & D.R. Dewey) is being developed for use as a new perennial grain crop through breeding and agronomic research. However, progress has been hampered by lack of understanding of environmental requirements for flowering and grain production. Therefore, we developed a phenology model for IWG adapted from the STICS soil-crop model. The model was compliant with experimental results (relative root mean square error = 0.03). The optimal vernalizing temperature was between 4 and 5°C, optimal daylength between 13 and 14h, while daylength below 11h slowed reproductive development. Vernalization requirement was found to be a constraining inductive process. Including a photoperiod limitation to the model with temperature improved its ability to predict induction at various latitudes. Therefore, timing and duration of vegetative vs. reproductive growth may differ between environments and change reproductive tiller elongation earliness, weed competitiveness, management timing, and stress conditions during phases critical to grain yield. Accurate phenology models will enable optimal field management and inform future breeding strategies. However, plasticity may lead to divergent ideotypes under various agroecosystems.
KW - Thinopyrum intermedium
KW - flowering induction
KW - modelling
KW - perennial grains
KW - photoperiod
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U2 - 10.1016/j.agrformet.2021.108341
DO - 10.1016/j.agrformet.2021.108341
M3 - Article
AN - SCOPUS:85100428565
SN - 0168-1923
VL - 301-302
JO - Agricultural and Forest Meteorology
JF - Agricultural and Forest Meteorology
M1 - 108341
ER -