Probable transcription factor that regulates abaxial identity during leaf development (PubMed:18594992). Modulates leaf rolling by regulating the programmed cell death (PCD) of abaxial mesophyll and sclerenchyma cells during leaf development (PubMed:19304938). Expressed in roots, stems, leaves and flowers (PubMed:18594992). Expressed in stems, anthers of young or mature flowers, pistil tips, glumes, vascular tissues of mature seeds, coleoptile and embryonic root of germinating seedlings, root vascular tissues, leaf veins and leaf sheaths, guard cells, and leaf tracheal elements (PubMed:19304938). Rolled inward leaves like a cylinder at mature stage (PubMed:18594992). Narrow, extremely rolled and dark-green leaves (PubMed:19304938). Malformed spikelets with low seed sets (PubMed:18594992). Slight delay in heading date (PubMed:18594992). Disordered and irregular arrangement of chloroplast grana lamellae (PubMed:18594992). Abnormal sclerenchymatous cell development in the abaxial cell layers, altered mesophyll cell distribution, increased amounts of chlorophyll, and enhanced photosynthesis (PubMed:19304938). Altered seed morphology, and reduced root number and root length (PubMed:19304938).