Interkingdom signaling in plant-rhizomicrobiome interactions for sustainable agriculture.

The rhizosphere is a complex ecosystem around plant roots that comprises an integrated network of plant roots, the microbiome and soil. Wide spread communication between prokaryotes and eukaryotes occurs within this integrated network via a complex set of signal molecules secreted during both beneficial and harmful interactions. Intra- and inter-species communication among microbes occurs through various signal molecules that coordinate and control the behaviours of microorganisms in mixed communities. In addition, interkingdom signal exchange between plants and microbes occurs through the release of root exudates from the host plants. The diverse chemical substances released in root exudates affect the structural and physical heterogeneity of the soil. Moreover, chemical compounds released in root exudates trigger various signaling pathways in microbial populations that influence rhizosphere biology. Therefore, deciphering the language of interkingdom communication and understanding the mechanisms involved is innovative and promising approach for improving crop production in sustainable agriculture. This chapter describes briefly the shaping of the rhizomicrobiome in response to released root exudates. Moreover, predicting and controlling the microbiome structure and its function in the rhizosphere by understanding of rhizomicrobiome communication through different secreted compounds will allow us to better harness beneficial plant-microbe interactions. The recent progress in understanding interkingdom communication and interactions between plants and microbes is discussed in relation to plant growth, gene expression, nutrient uptake and resistance to pests and diseases along with mitigation of abiotic stresses in plants to improve plant ecosystem productivity for sustainable agriculture.