Day length dependent restructuring of the leaf transcriptome and metabolome in potato genotypes with contrasting tuberization phenotypes
WAYNE L. MORRIS, ROBERT D. HANCOCK, LAURENCE J M. DUCREUX, JENNY A. MORRIS, MUHAMMAD USMAN, SUSAN R. VERRALL, SANJEEV K SHARMA, GLENN BRYAN, JAMES W. MCNICOL, PETE E. HEDLEY and MARK A. TAYLOR
Article first published online: 12 DEC 2013 | DOI: 10.1111/pce.12238
The molecular mechanisms that control tuber formation have been investigated in detail over the past few decades because the control of tuber initiation, number and size uniformity is probably the largest economic constraint of modern potato production. Recent breakthroughs have identified components of the photoperiodic signalling pathway that leads to tuberisation. In this work we have characterised the biochemical and transcriptional responses in two divergent potato genotypes under contrasting day length regimes and revealed new insights into tuberisation and associated processes. Furthermore, we reveal the intriguing presence of an additional StSP6A allele that is associated with tuber formation under long day length conditions. Overall, the data presented in this study highlight the subtle interplay between components of the clock-CONSTANS-StSP6A axis which collectively may interact to fine-tune the timing of tuberisation.