Putative oxidoreductase (By similarity). Required for vegetative shoot apex development, especially during leaf positioning and for shoot apical meristem (SAM) maintenance (PubMed:7849756). Expressed in roots, stems, leaves and flowers and, at lower levels, in siliques. Disruption of the development of the vegetative shoot apex. Abnormal leaf positioning and impaired shoot apical meristem (SAM) maintenance, leading to the death of most plants prior to the end of vegetative development. Belongs to the short-chain dehydrogenases/reductases (SDR) family.