Biosynthesized nanoparticles and implications by their use in crops: Effects over physiology, action mechanisms, plant stress responses and toxicity

•Biosynthesized nanoparticles have potential application in agriculture as nanoaditives.•Physiology changes by biosynthesized NPs in plants are the main concern reported.•Studies of the rhizosphere changes by biosynthesized NPs in crops are needed for a better understanding.•Action mechanisms and biosynthesized NPs uptake in plants by are not fully understood.•Plant stress alleviation can be achieved by biosynthesized NPs application.