Role of Nitric Oxide as a Double Edged Sword in Root Growth and Development

Nitric oxide is a gaseous molecule which has been given the status of signalling hormone in animals as well as plants. It has expansive continuum of regulatory functions involving all aspect of plant’s growth and development, and also under several environmental cues. As NO is a part of a redox network, it’s intermediate forms each of which form the signalling molecules. In prospect of this book chapter we discuss the role of this gaseous molecule and its impact in roots in plants, highlighting its interplay with other well featured hormones, in terms of its detection and how it acts as a double edged sword.