中文摘要：

血红素加氧酶（heme oxygenase, HO）是血红素分解代谢的关键酶类，在植物体内起着重要的作用。本文从HO在植物光敏色素合成中的作用、对植物根形态建成、提高植物抗胁迫反应能力、促进植物种子萌发和调节植物气孔关闭等方面，综述植物HO生理功能的最新研究进展，并对HO未来研究方向进行展望。

英文摘要：

Heme oxygenase （HO） is a key enzyme that catalyzes the oxidative degradation of heme to carbon monoxide （CO）, free iron, and biliverdin （BV）.This review focuses on the recent advances of HO research made in plant including HO playing the role in phytochrome synthesis,regulating the constitution in morphological architecture of root,raising the resistance of plant against stress,and promoting the germination of seeds and regulating the closure of stoma, etc. Forthmore,the direction of coming research is made a discussion.