The world important food crop—cultivated rice (
Oryza sativa)—is domesticated from its wild ancestor (
O. rufipogon, A). Cultivated rice has differentiated into indica subspecies (
O. sativa subsp.
indica, C) and japonica subspecies (
O. sativa subsp.
japonica, D), adapting to tropical and temperate regions. Weedy rice (
O. sativa f.
spontanea, B) is morphologically between the wild and cultivated rice and has close relationships with them. Photographed by Bao-Rong LU. See LIU et al., pp. 1–11 in this issue.
graphed by Bao-Rong LU. See LIU et al., pp. 1–11 in this issue.
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