The mitogen-activated protein kinase kinase 9 (MKK9) modulates nitrogen acquisition and anthocyanin accumulation under nitrogen-limiting condition in Arabidopsis
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AbstractNitrogen (N) plays important roles as both a macronutrient and signal in plant growth and development. However, our understanding of N signaling and/or response mechanisms in plants is still limited. Here, we show that the mitogen-activated protein kinase kinase 9 (MKK9) is involved in plant N responses in Arabidopsis by regulating production of anthocyanins and the ability of N acquisition under low N conditions. Transgenic plants that express a constitutively active version of MKK9 (MKK9DD) showed decreased accumulation of anthocyanins and reduced expression of key anthocyanin biosynthetic genes under low N condition compared to the plants expressing the inactive form of MKK9 (MKK9KR). The decreased anthocyanin accumulation could be due to the increased N level in the MKK9DD plants as these plants were shown to accumulate more N and have higher expression of N acquisition-related genes under low N condition as compared with the MKK9KR plants. Taken together, our results suggest that MKK9 plays a role in plant adaptation to low N stress by modulating both anthocyanin accumulation and N status.
Acceptance Date12/04/2017
All Author(s) ListJuan Luo, Xu Wang, Lei Feng, Yan Li, Jun-Xian He
Journal nameBiochemical and Biophysical Research Communications
Volume Number487
Issue Number3
Pages539 - 544
LanguagesEnglish-United States
KeywordsMKK9,Low nitrogen stress, Anthocyanin accumulation, Nitrogen acquisition, Arabidopsis thaliana

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