(A) The panicles per plant, (B) grains per panicle, (C) total grains per plant, (D) panicle number per plant, (E) grain number per panicle, (F) seed setting rate, and (G) grain yield per plant of SN9816 and OsATG8c-overexpressing transgenic rice grown under NS (225 kg·ha−1) conditions. Scale bar: 5 cm. Biomass per plant (dry weight of all aboveground) (H), nitrogen uptake efficiency (NUpE) (I), and nitrogen use efficiency (NUE) (J) of SN9816 and OsATG8c-overexpressing lines grown under NS (225 kg·ha−1) and NL (75 kg·ha−1) conditions. Values are the means ± SD (n = 12), * p < 0.05, ** p < 0.01 (t-test).