Reference Report for AP20210614.5
| Title: | WRKY75 transcription factor is a modulator of phosphate acquisition and root development in Arabidopsis. |
| Authors: | Devaiah, B.N., Karthikeyan, A.S., Raghothama, K.G. |
| Source: | Devaiah et al. 2007 Plant Physiology, 143:4:1789-1801 |
| Abstract: | Phosphate (Pi) deficiency limits plant growth and development, resulting in adaptive stress responses. Among the molecular determinants of Pi stress responses, transcription factors play a critical role in regulating adaptive mechanisms.WRKY75is one of several transcription factors induced during Pi deprivation. In this study, we evaluated the role of theWRKY75transcription factor in regulating Pi starvation responses in Arabidopsis (Arabidopsis thaliana). WRKY75 was found to be nuclear localized and induced differentially in the plant during Pi deficiency. Suppression ofWRKY75expression through RNAi silencing resulted in early accumulation of anthocyanin, indicating that the RNAi plants were more susceptible to Pi stress. Further analysis revealed that the expression of several genes involved in Pi starvation responses, including phosphatases,Mt4/TPS1-like genes, and high-affinity Pi transporters, was decreased whenWRKY75was suppressed. Consequently, Pi uptake of the mutant plant was also decreased during Pi starvation. In addition, whenWRKY75expression was suppressed, lateral root length and number, as well as root hair number, were significantly increased. However, changes in the root architecture were obvious under both Pi-sufficient and Pi-deficient conditions. This indicates that the regulatory effect ofWRKY75on root architecture could be independent of the Pi status of the plant. Together, these results suggest that WRKY75 is a modulator of Pi starvation responses as well as root development.WRKY75is the first member of the WRKY transcription factor family reported to be involved in regulating a nutrient starvation response and root development. |
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