O Óxido Nítrico mitiga o déficit hídrico no milho? Revisão sistemática e metanálise.

Abstract

The corn crop is one of the most important in the world agricultural scenario and plays a fundamental role in the economy of many countries, however some biotic and abiotic factors can impact negative results on this crop. An abiotic factor that stands out among the others is the water deficit. Under these conditions, research has been carried out with the aim of identifying ways to make the plant more tolerant to this type of stress. Nitric Oxide is a molecule that performs several physiological effects in plants, and one of these may be involved in increasing tolerance to water stress, so the objective of the present study was to carry out a systematic review with meta-analysis to verify if Nitric Oxide can act as a Signaling molecule on water stress tolerance in maize plants. The study is a systematic review with meta-analysis developed in accordance with the guidelines of the PRISMA recommendation (Preferred Reporting Items for Systematic Reviews and Meta-analyses), under registration in the International Prospective Register of Ongoing Systematic Reviews (PROSPERO) number CRD 42022335324. In all, 1,843 records were identified, of which 67 were destined for bibliometric analysis and 6 for meta-analysis. The trend in the number of publications showed an increase between the years 2002 to 2021, with b1 of 0.1584, the surveys were carried out in 18 different countries and China was the country with the highest number of investigations. For the meta-analysis, the following variables were used: lipid peroxidation (MDA), Superoxide Dismutase (SOD) activity and the presence of NO. After NO application, there was a decrease in MDA levels and an increase in SOD activity. The effect size was calculated and through its results it can be said that NO acts as a signaling molecule in tolerance to water stress in maize plants.