Abstract
The effect of photoperiods of 8 h (8:16 light:dark), 12 h (12:12), and 16 h (16:8) on flowering time, plant architecture, and biomass production were investigated in an RIL population derived from a cross between domesticated foxtail millet (Setaria italica) and its wild progenitor green foxtail (S. viridis). Flowering time, height, and biomass were found to be highly and positively correlated in all three photoperiod regimes. Branching, however, is weakly and variably associated with the other three traits. After the effects of variation in daily radiation and temperature were removed, ANOVA analyses of Photoperiod and RIL (genotype) found both factors and their interaction significant for all traits, with RIL and Photoperiod * RIL also explaining large amounts of variation. However, while Photoperiod by itself explained much of the variation in flowering time and in branching, it explained little of that for height and biomass. Regions were identified where all three trials identify QTL in the same genomic regions as well as QTL found in either the 8 and 12 h trials or the 12 and 16 h trials. This pattern may be evidence for differences in regulation between shorter and longer photoperiods. Comparison of QTL with previous greenhouse and field trials finds several overlapping QTL and multiple independent QTL. A well-supported QTL region on chromosome IV has been shown previously to contain a number of genes in the CONSTANS—FT pathway, and these results suggest that this pathway is conserved across photoperiods. Further genetic analysis of the multiple non-overlapping QTL regions between the photoperiod trials will be necessary to narrow down a list of candidate genes responsible for differences in flowering time and architecture between photoperiods.
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Acknowledgements
I would like to thank Jessica Stromski for phenotyping and plant care and Margarita Mauro-Herrera for genetic analyses and fruitful discussions.
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Doust, A.N. (2017). The Effect of Photoperiod on Flowering Time, Plant Architecture, and Biomass in Setaria. In: Doust, A., Diao, X. (eds) Genetics and Genomics of Setaria. Plant Genetics and Genomics: Crops and Models, vol 19. Springer, Cham. https://doi.org/10.1007/978-3-319-45105-3_12
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DOI: https://doi.org/10.1007/978-3-319-45105-3_12
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