The Effect of Virulence and Resistance Mechanisms on the Interactions between Parasitic Plants and Their Hosts

• Published in: International journal of molecular sciences 2020-12, Vol.21 (23), p.9013
• Main Authors: Hu, Luyang, Wang, Jiansu, Yang, Chong, Islam, Faisal, Bouwmeester, Harro J, Muños, Stéphane, Zhou, Weijun
• Format: Article
• Language: English
• Subjects: Agricultural production; Biological Evolution; Botanics; Control methods; CRISPR; Evolution; Flowers & plants; Food security; Gene expression; Genes; Genome editing; Genomes; host; Host plants; Host-Parasite Interactions - physiology; Leucine; Life Sciences; Microbiology and Parasitology; Nucleotides; Nutrients; Orobanche - genetics; Orobanche - parasitology; Parasites; parasitic plant; pathogen effector; Photosynthesis; Physiology; Plant breeding; Proteins; race; resistance mechanism; Review; RNA-mediated interference; Seeds; Striga - genetics; Striga - physiology; Transcriptome - genetics; Vegetal Biology; Virulence; Virulence - genetics; Weeds
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms21239013

Parasitic plants have a unique heterotrophic lifestyle based on the extraction of water and nutrients from host plants. Some parasitic plant species, particularly those of the family Orobanchaceae, attack crops and cause substantial yield losses. The breeding of resistant crop varieties is an inexpensive way to control parasitic weeds, but often does not provide a long-lasting solution because the parasites rapidly evolve to overcome resistance. Understanding mechanisms underlying naturally occurring parasitic plant resistance is of great interest and could help to develop methods to control parasitic plants. In this review, we describe the virulence mechanisms of parasitic plants and resistance mechanisms in their hosts, focusing on obligate root parasites of the genera and . We noticed that the resistance (R) genes in the host genome often encode proteins with nucleotide-binding and leucine-rich repeat domains ( proteins), hence we proposed a mechanism by which host plants use proteins to activate downstream resistance gene expression. We speculated how parasitic plants and their hosts co-evolved and discussed what drives the evolution of virulence effectors in parasitic plants by considering concepts from similar studies of plant-microbe interaction. Most previous studies have focused on the host rather than the parasite, so we also provided an updated summary of genomic resources for parasitic plants and parasitic genes for further research to test our hypotheses. Finally, we discussed new approaches such as CRISPR/Cas9-mediated genome editing and RNAi silencing that can provide deeper insight into the intriguing life cycle of parasitic plants and could potentially contribute to the development of novel strategies for controlling parasitic weeds, thereby enhancing crop productivity and food security globally.