An explanatory model of temperature influence on flowering through whole-plant accumulation of FT in Arabidopsis thaliana  

Hannah A. Kinmonth-Schultz, Melissa J. S. MacEwen, Daniel D Seaton, Andrew J. Millar, Takato Imaizumi, Soo-Hyung Kim

Research output: Contribution to journalArticlepeer-review

Abstract

We assessed mechanistic temperature influence on flowering by incorporating temperature-responsive flowering mechanisms across developmental age into an existing model. Temperature influences the leaf production rate as well as expression of FLOWERING LOCUS T (FT), a photoperiodic flowering regulator that is expressed in leaves. The Arabidopsis Framework Model incorporated temperature influence on leaf growth but ignored the consequences of leaf growth on and direct temperature influence of FT expression. We measured FT production in differently aged leaves and modified the model, adding mechanistic temperature influence on FT transcription, and causing whole-plant FT to accumulate with leaf growth. Our simulations suggest that in long days, the developmental stage (leaf number) at which the reproductive transition occurs is influenced by day length and temperature through FT, while temperature influences the rate of leaf production and the time (in days) the transition occurs. Further, we demonstrate that FT is mainly produced in the first 10 leaves in the Columbia ecotype, and that FT accumulation alone cannot explain flowering in conditions in which flowering is delayed. Our simulations supported our hypotheses that: 1) temperature regulation of FT, accumulated with leaf growth, is a component of thermal time, and 2) incorporating mechanistic temperature regulation of FT can improve model predictions when temperatures change over time.
Original languageEnglish
Article numberdiz006
JournalIn Silico Plants
Volume1
Issue number1
DOIs
Publication statusPublished - 15 May 2019

Keywords

  • Arabidopsis
  • Arabidopsis thaliana
  • crop simulation model
  • flowering time
  • Framework Model
  • FT
  • mathematical model
  • phenology
  • photoperiodic flowering
  • thermal time

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