Thingnaes, Elin, Sissel Torre, Arild Ernstsen, Roar Moe. 2003. Day and Night Temperature Responses in Arabidopsis: Effects on Gibberellin and Auxin Content, Cell Size, Morphology, and Flowering Time. Annals of Botany Vol 92:601-612.
This paper looks at the effects of sixteen different day and night temperature levels on the rosette growth, flower stem elongation, and flowering time of Arabidopsis. As night temperature was increased, the final leaf length decreased because both elongation rate and period were reduced. Day temperature had no effect on leaf length. Increased day temperature resulted in an increased stem length because of the increased elongation rate. However, it decreased with an increase in night temperature due to the shortened elongation period. Transitioning to a flowering period was increased by the increase of night temperatures. Cell volume was increased in flower stems during D22/N12 as compared to D12/N22 because of higher auxin levels under the D22/N12 temperature settings. IAA is an essential factor for stem elongation. This study has implied that auxin plays a role in the elongation rate of the flower stem and circadian growth rhythm of the flower stem in Arabidopsis. The findings indicate that thermoperiodic responses on stem elongation may be mediated by altered IAA levels.
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