根际
铁载体
吸水链霉菌
染色体易位
光合作用
生物
水稻
植物
螯合作用
叶绿素
营养物
超量积累植物
内生菌
化学
生物化学
植物修复
细菌
基因
链霉菌
有机化学
污染
遗传学
生态学
作者
Lidan Cao,Yan Gao,Jin Yu,Shuqi Niu,Jiarui Zeng,Qingqing Yao,Xiang Wang,Zhigang Bu,Ting Xu,Xuanming Liu,Yonghua Zhu
标识
DOI:10.1016/j.plaphy.2020.11.013
摘要
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 siderophore 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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