Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 158, Issue -, Pages 275-283Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2020.11.013
Keywords
Endophyte; Streptomyces hygroscopicus; Fe deficiency; Stress resilience; Fe acquisition; Rice (oryza); Plant-microbe interactions
Categories
Funding
- National Natural Science Foundation of China [31672093, 31571635]
- National Key R&D Program of China [2018YFD1000603]
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The endophytic actinobacteria OsiSh-2 can enhance the resilience of host plants against iron deficiency stress by modulating iron acquisition and translocation, ultimately leading to improved plant fitness.
The limited availability of nutrient Fe severely impairs the health of almost all organisms. Endophytic actinobacteria can benefit the host plant in different ways. We previously inferred that the rice (Oryza) endophytic Streptomyces hygroscopicus OsiSh-2 possesses a highly efficient Fe-acquisition system. In this work, we first evaluated the effects of OsiSh-2 on the Fe-deficiency resilience of the host rice. The results demonstrated that the inoculation of OsiSh-2 considerably increased the plant biomass, Fe concentration and translocation factor, and chlorophyll content, and net leaf photosynthetic rate under Fe limiting condition. The expression of genes involved with Fe3+-reduction-related strategy in rice was up-regulated, while that involved with Fe3+-chelation-related strategy was down-regulated by OsiSh-2 treatment. Meanwhile, the OsiSh-2-rice symbiont showed enhancement of Fe3+-chelate reductase activity, total sidemphore production, and acidification trend in the rhizosphere under Fe deficiency compared to plants without this endophyte. In conclusion, endophytic OsiSh-2 could protect plants against Fe-deficient stress by a sophisticated interaction with the host, including modulating Fe chelation, solubilization, reduction and translocation, ultimately leading to enhanced fitness of plant.
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