Journal
FRONTIERS IN PLANT SCIENCE
Volume 6, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2015.01024
Keywords
Glycine max; isoflavone reductase; Phytophthora sojae; isoflavonoid; gene expression; antioxidant properties
Categories
Funding
- Heilongjiang Province outstanding youth fund [JC201308]
- NSFC Projects [30971811, 31071439, 31171577, 31101167]
- Natural Science Foundation of Heilongjiang Province [C2015010]
- Specialized Research Fund for the Doctoral Program of Higher Education [20112325120005]
- Science and Technology Innovation Project in Harbin [2012RFQXN011, 2012REXXN019]
- Research Fund for Young Teachers through NEAU [2012 RCB 08]
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Isoflavone reductase (IFR) is an enzyme involved in the biosynthetic pathway of isoflavonoid phytoalexin in plants. IFRs are unique to the plant kingdom and are considered to have crucial roles in plant response to various biotic and abiotic environmental stresses. Here, we report the characterization of a novel member of the soybean isoflavone reductase gene family Gm/FE?. Overexpression of Gm/FR transgenic soybean exhibited enhanced resistance to Phytophthora sojae. Following stress treatments, Gm/FR was significantly induced by P. sojae, ethephon (ET), abscisic acid (placeCityABA), salicylic acid (SA). It is located in the cytoplasm when transiently expressed in soybean protoplasts. The daidzein levels reduced greatly for the seeds of transgenic plants, while the relative content of glyceollins in transgenic plants was significantly higher than that of non-transgenic plants. Furthermore, we found that the relative expression levels of reactive oxygen species (ROS) of transgenic soybean plants were significantly lower than those of non-transgenic plants after incubation with P sojae, suggesting an important role of Gm/FR might function as an antioxidant to reduce ROS in soybean. The enzyme activity assay suggested that GmIFR has isoflavone reductase activity.
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