Fig. 1

Phenotypic analysis of the spikelets and flowers in OX167d. a The inheritance of cleistogamy in the OX167d lines. The white arrows indicate the anthers that move out from the flowers. Red arrows indicate the stamens that remain inside the spikelets, forming the black dots. b, c The inner view of the flowers at the different stages. The early filling stage (c I), middle filling stage (c II), and late filling stage (b, c III). Red arrows indicate the stamens