Trends in Plant Science
ReviewStrigolactones in Plant Interactions with Beneficial and Detrimental Organisms: The Yin and Yang
Section snippets
The Plant Microbiome
Plants interact with a range of organisms both above- and belowground. Aboveground, plants may interact with microbes, insect herbivores, birds, and other plants that constitute the phyllosphere (see Glossary) and influence plant growth and development 1, 2. Belowground, plant roots grow in a highly dynamic environment containing fungi, bacteria, nematodes, invertebrates, parasitic plants, and the roots of neighboring plants (Figure 1, Key Figure). In particular, the specific rhizosphere
Strigolactones: Multifunctional Molecules in Action
SLs act in planta to regulate shoot branching and root system architecture, adventitious root formation, secondary growth, and leaf senescence (reviewed in [9]). They also contribute to plant responses to nutritional stress, especially phosphorous (P) deprivation 9, 10. More recently, they have also been associated with other abiotic stresses, such as drought and salinity, and even to biotic stress, as we discuss below 11, 12, 13, 14. SLs are apocarotenoids, a class of biologically important
Arbuscular Mycorrhizal Symbiosis
SLs present in root exudates attract AM fungi of the Glomeromycota during the presymbiotic phase (Figure 1 and Table 1), both by enhancing the germination of spores and metabolic activity, and by promoting AM fungal hyphal branching to increase the chance of contact between the hyphae and the host root 32, 33, 34, 35. The development of AM symbiosis dates back more than 450 million years and is considered a crucial step in the evolution of land plants [36]. The symbiosis helps host plants to
Root Parasitic Plants
As mentioned above, SLs were first identified during the 1960s as chemical cues for root parasitic plants of the Orobanchaceae to detect host plants (Figure 1 and Table 1). The SL strigol was identified as a germination stimulant for the parasitic plant Striga spp. [69]. These parasitic weeds, including the genera Striga, Orobanche, and Phelipanche, are obligate parasites that require a host to supply a carbon source within a few days of germination. They are major threats to agriculture,
Strigolactones Interact with Plant Defense Phytohormones
Some of the studies described above suggest that SLs, rather than having a direct effect on the growth or development of pathogenic organisms, interact in planta with other plant defense hormones to influence disease development. Indeed, there are reports of interactions of SL with other plant hormones, although these interactions may vary depending on the developmental process and tissue type [9]. For example, reduced levels of the defense hormones JA, salicylic acid (SA), and ABA were found
Concluding Remarks and Future Perspectives
One of the major challenges for agriculture in the near future is to find more sustainable and environmentally friendly alternatives to reduce the use of chemical fertilizers and pesticides without compromising yield and food quality. One strategy is to harness interactions with beneficial soil microorganisms, including AM fungi and N-fixing rhizobia, that may reduce the need for fertilizers, while increasing crop resilience against diverse stresses under field conditions (see Outstanding
Acknowledgments
The authors thank James B. Reid for critical reading of the manuscript. Research carried out by the authors is supported by the grants AGL2015-64990-C2-1-R from the National R&D Plan of the Ministry of Economy and Competitiveness (MINECO) to J.A.L-R., MEXT KAKENHI grants (No, 24228008 and 15H05959) to K.S., and FF140100770 from the Australian Research Council (ARC) to E.F.
Glossary
- Arbuscular mycorrhizal (AM) symbiosis
- a mutualistic plant association established between soil fungi of the phylum Glomeromycota and most land plants. This symbiosis facilitates the uptake of water and nutrients by the host plant.
- Biofertilizers
- microorganisms that, when applied to seeds, plant surfaces, or soil, colonize the rhizosphere or the root system, promoting plant growth by increasing the supply of nutrients to the host plant.
- Bioprotection agents
- microorganisms that protect plant-based
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