![]() ![]() Sequence analysis of the SP gene family revealed that its members share homology along their entire coding regions both among themselves and with the six members of the Arabidopsis family. Here we report that SP is a member of a gene family in tomato composed of at least six genes, none of which is represented in the tomato EST collection. SP is a developmental regulator which is homologous to CENTRORADIALIS ( CEN) from Antirrhinum and TERMINAL FLOWER 1 ( TFL1) and FLOWERING LOCUS T ( FT) from Arabidopsis. The SELF PRUNING ( SP) gene controls the regularity of the vegetative-reproductive switch along the compound shoot of tomato and thus conditions the `determinate' ( sp/ sp) and `indeterminate' ( SP −) growth habits of the plant.
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