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Significance Meristem determinacy/indeterminacy influences flower number and seed production in crops. Two closely related cool-season cereals, barley and wheat, produce variable and defined numbers of spikelets in their inflorescences, respectively. In this study, we identify a series of allelic barley mutants namedintermedium-m anddouble seed1 that develop wheat-like determinate inflorescences producing a terminal spikelet and a reduced number of spikelets. INT-M/DUB1 is an APETALA2-like transcription factor that promotes an active inflorescence meristem via suppression of spikelet initiation and the maintenance of meristem identity. Our work has identified key regulators that may prolong meristem activities and could be genetically engineered in barley, wheat, and other cereals to improve grain yield.

INTERMEDIUM-Mencodes anHvAP2L-H5ortholog and is required for inflorescence indeterminacy and spikelet determinacy in barley