西亚试剂：SPATULA Links Daytime Temperature and Plant Growth Rate

SPATULA Links Daytime Temperature and Plant Growth Rate
Kate Sidaway-Lee1, Eve-Marie Josse2, Alanna Brown1, Yinbo Gan1, 3, Karen J. Halliday2, Ian A. Graham1 and Steven Penfield 1

1 Department of Biology, University of York, P.O. Box 373, York YO10 5YW, UK
2 Institute of Molecular Plant Sciences, School of Biological Sciences, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JH, UK

Plants exhibit a wide variety of growth rates that are known to be determined by genetic and environmental factors, and different plants grow optimally at different temperatures [[1] and [2]], indicating that this is a genetically determined character. Moderate decreases in ambient temperature inhibit vegetative growth, but the mechanism is poorly understood, although a decrease in gibberellin (GA) levels is known to be required [3]. Here we demonstrate that the basic helix-loop-helix transcription factor SPATULA (SPT), previously known to be a regulator of low temperature-responsive germination [4], mediates the repression of growth by cool daytime temperatures but has little or no growth-regulating role under warmer conditions. We show that only daytime temperatures affect vegetative growth and that SPT couples morning temperature to growth rate. In seedlings, warm temperatures inhibit the accumulation of the SPT protein, and SPT autoregulates its own transcript abundance in conjunction with diurnal effects. Genetic data show that repression of growth by SPT is independent of GA signaling and phytochrome B, as previously shown for PIF4 [5]. Our data suggest that SPT integrates time of day and temperature signaling to control vegetative growth rate.

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