Scientists must find a promoter to direct its expression, so that the rice will grow well under normal weather conditions and put on the brakes only when water is scarce.
只有找到並同時殖入抗旱基因的啟動子，才能讓抗旱基因「該表現時才表現」，如此一來，作物平時長得好，旱災時又能發揮抗旱能力，挺過逆境。