Carbon Monoxide: a Ubiquitous Gaseous Signaling Molecule in Plants -- Nitric oxide emission and uptake by higher plants -- Modulation of nitric oxide levels by phytoglobin affects developmental and stress responses in plants -- Growth promoting effects of NOx fumigation and phytoglobins -- Nitric oxide (NO), a central gasotransmitter at early plant developmental stages -- Nitric oxide acts at the crossroad between auxin and reactive oxygen species determining the outcome of root growth and development -- Nitric oxide: a multi-task player in plant-microorganism symbioses -- Emerging functions of nitric oxide in plant immunity -- Protein denitrosylation in plant biology -- Functions and metabolism of S-nitrosothiols and S-nitrosylation of proteins in plants: the role of S-nitrosoglutathione reductase -- Hydrogensulfide in plants -- Regulation of autophagy by hydrogen sulfide -- Deciphering the dialogue between NO and H2S in guard cells -- New features of the NO/H2S crosstalk: a chemical basis.

This book describes the three gasotransmitters nitric oxide (NO), hydrogen sulphide (H2S) and carbon monoxide (CO) and their function as intracellular signalling molecules in plants. Common properties are shared by NO, H2S and CO: they are beneficial at low concentrations but hazardous in higher amounts; they are small molecules of gas; they can freely cross cell membranes; their effects do not rely on receptors; they are generated enzymatically and their production is regulated; their functions can be mimicked by exogenous application; and their cellular effects may or may not be mediated by second messengers, but have specific cellular and molecular targets. In plants, many aspects of the biology of gasotransmitters remain completely unknown and generate intriguing questions, which will be discussed in this book.