Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, Jilin Province, China; Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, 130024, Jilin Province, China.
Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, Jilin Province, China.
Plant Physiol Biochem. 2019 Sep;142:106-116. doi: 10.1016/j.plaphy.2019.06.028. Epub 2019 Jun 22.
This study presents evidence that strigolactones (SLs) promote defense against devastating rice blast fungal pathogen Magnaporthe oryzae. Impairment in either SL-biosynthetic dwarf17 (d17) or -signaling (d14) led to increased susceptibility towards M. oryzae. Comparative transcriptome profiling of the SL-signaling d14 mutant and WT plants revealed that a large number of defense-associated genes including hydrogen peroxide (HO)-, ethylene- and cell wall-synthesis-related genes were remarkably suppressed in d14 with respect to that of WT plants, during M. oryzae infection. In addition, various KEGG metabolic pathways related to sugar metabolism were significantly suppressed in the d14 plants compared to WT, during M. oryzae infection. Accordingly, WT plants accumulated increased levels of HO and soluble sugar content compared to that of d17 and d14 in response to M. oryzae infection. Altogether, these results propose that SLs positively regulated rice defense against M. oryzae through involvement in the induction of various defense associated genes/pathways.
本研究表明，独脚金内酯（SLs）可促进水稻抵御破坏性稻瘟病菌（Magnaporthe oryzae）。独脚金内酯生物合成缺陷型突变体（d17）或信号缺陷型突变体（d14）均会导致对稻瘟病菌的易感性增加。对 SL 信号突变体 d14 和 WT 植物的比较转录组分析表明，在稻瘟病菌感染过程中，大量与防御相关的基因，包括过氧化氢（HO）、乙烯和细胞壁合成相关基因，在 d14 中相对于 WT 植物显著受到抑制。此外，与 WT 相比，在稻瘟病菌感染过程中，d14 植物中与糖代谢相关的各种 KEGG 代谢途径显著受到抑制。因此，与 d17 和 d14 相比，WT 植物在受到稻瘟病菌感染时，HO 和可溶性糖含量增加。综上所述，这些结果表明，SLs 通过参与诱导各种防御相关基因/途径，正向调控水稻对稻瘟病菌的防御。
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