Abiotic stress impact on the interaction between Macrophomina phaseolina and crop plants

Abstract

Macrophomina phaseolina (Tassi.) Goid is an emerging pathogen that causes diseases like dry root rot and charcoal rot in more than 100 plant families. Abiotic stresses such as drought, salinity, and heat exacerbate this fungal effect and predispose crops to pathogen attacks. Importantly, these combined stresses lead to significant crop yield losses under field conditions. In this, we review the interaction between the devastating pathogen M. phaseolina and several abiotic stresses that are more likely to occur in scenarios of climate change. Drought, heat, and salinity are the major stresses that interact with M. phaseolina in the field. We discuss several field studies, unique physiological and molecular responses, and their mechanisms of control in response to combined stress. The net effect of these interactions depends on a multitude of factors; thus, these interactions modify the impact of biotic stresses on plants by altering their susceptibility. The aim of this review is to provide an overview of what is currently known about M. phaseolina and abiotic stress interactions, as well as several other edaphic factors that interact with plants. We briefly discuss the role of drought, salinity, heat stress, and edaphic factors (such as pH, N, P, K, etc.) that influence pathogen infection in plants. Furthermore, we discuss possible management strategies to combat crop loss due to combined stress. Thus, we suggest the future aspect of combined stress breeding, along with the use of multi-omics techniques and genome editing approaches, to develop cultivars that exhibit stability in a combined stress environment.