Paleo-Green Revolution for rice

摘要

A central element of the Green Revolution was the widespread adoption of semidwarf rice cul tivars (SRCs) that more than doubled worldwide rice production (1). The high-yield potentials of modern SRCs are attributed primarily to their improved harvest index, lodging resistance, and re sponsiveness to high inputs (primarily ni trogen and water) (1-3), contributing to their adoption in irrigated areas that oc cupy 57% of world rice lands (4). The short stature of SRCs is caused by sdl, a mutant allele in the gene encoding a key enzyme (gibberellin 20-oxidase) function ing in biosynthesis of the plant hormone gibberellic acid (GA) that greatly reduces content of the bioactive molecule GA_1 (5, 6).