More than 30 years of research consolidate nitric oxide (NO) as a signal molecule required in a broad range of physiological processes in plants. This redox-active molecule is an essential messenger of phytohormones involved in growth and development, participates in plant responses to a myriad of abiotic stresses, plant immunity, and during plant-microbe interactions. Many questions arose about the enzymatic source of NO and it has not been completely clarified to date. The search in more than a thousand genomes of terrestrial plants strongly suggests that there is no gene coding for nitric oxide synthase (NOS) at least as we know it in animals. In the last years, the discovery of canonical NOS proteins in algae and cyanobacteria opens a field of special interest about the role of NOSs in these groups. Innovative ideas and strategies to deep inquire the molecular mechanism triggered by NO in photosynthetic organisms are required.

We propose a Research Topic that brings together the latest advances in the NO action and synthesis in photosynthetic organisms. We would like to cover themes related to novel processes mediated by NO as well as new techniques and strategies developed to unravel NO function in photosynthetic organisms in a concerted and comprehensive way.

Potential themes include but are not limited to:·
• Biological role of NO in land plants, algae, and cyanobacteria ranging from growth and development, immunity, and responses to abiotic stresses.
• NO cross-talk with other signaling molecules and plant hormones.
• Enzymatic and non-enzymatic NO production in photosynthetic organisms.
• NO signaling and posttraductional modifications (PTMs).
• Involvement of NO in nitrogen metabolism
• New strategies for NO detection and biotechnological applications of NO

Please note: Studies falling into the categories below will not be considered for review unless they are expanded and provide insight into the biological system or process being studied:
i) Descriptive collection of transcripts, proteins, or metabolites, including comparative sets as a result of different conditions or treatments;
ii) Descriptive studies that define gene families using basic phylogenetics and the assignment of cursory functional attributions (e.g. expression profiles, hormone or metabolites levels, promoter analysis, informatic parameters).

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Frontiers in Plant Science

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