(P4B-1) Does externally supplied sucrose act as an alternative to photosynthates or a signal which can alleviate root growth failure in the common bean (Phaseolus vulgaris L.) dwarf plants? (Abstract 523)
Muhammad Iqbal^*,1, Evangelos Leonardos¹, Bernard Grodzinski¹, ¹ Department of Plant Agriculture, Guelph, ON, Canada

(P4B-2) Diel patterns of leaf ¹⁴C-export and of main and lateral shoot growth for Flaveria linearis with altered leaf sucrose-starch partitioning. (Abstract 524)
Evangelos Leonardos^*,1, Barry Micallef¹, Malgre Micallef¹, Bernard Grodzinski^*,1, ¹ Department of Plant Agriculture, Guelph, ON, Canada

(P4B-3) Regulation of photosynthesis and leaf metabolism by trehalose 6-phosphate. (Abstract 525)
Matthew Paul^*,1, Henriette Schluepmann², Sjef Smeekens², Deveraj Jhurreea¹, Till Pellny¹, ¹ Rothamsted Research, Harpenden, Herts, UK² Utrecht University, Utrecht, Netherlands

(P4B-4) Purification and characterization of recombinant ethylene receptor ETR1 from Arabidopsis thaliana. (Abstract 526)
Jan Voet-van-Vormizeele^*,1, Georg Groth¹, ¹ Institute of plant biochemistry, Düsseldorf, Germany

(P4B-5) Transcriptome analysis of an Arabidopsis mutant with perturbed photosynthetic carbohydrate metabolism and altered redox status. (Abstract 527)
Robin Walters^*,1, Nicholas Kruger¹, ¹ Department of Plant Sciences, Oxford, UK