A Receptor-Like Kinase Mediates Ammonium Homeostasis and Is Important for the Polar Growth of Root Hairs in Arabidopsis

    April 2014 in “ ˜The œPlant cell ”
    Ling Bai, Xiao-Nan Ma, Guozeng Zhang, Shufei Song, Yun Zhou, Lei Gao, Yuchen Miao, Chun‐Peng Song
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    Studysummary In this study, researchers showed that the CAP1 gene regulates root hair growth in plants by modulating cytoplasmic ammonium levels and maintaining calcium gradients, highlighting its role in ammonium homeostasis. Our plain-language summary of this paper — not a Tressless recommendation.
    The study identified CAP1, a receptor-like kinase in Arabidopsis, as crucial for maintaining ammonium (NH4+) homeostasis and essential for the polar growth of root hairs. CAP1 regulated NH4+ transport to the vacuole, maintaining cytoplasmic calcium (Ca2+) gradients necessary for root hair development. Mutants lacking CAP1 (cap1) showed disrupted Ca2+ gradients and impaired root hair growth due to excess cytoplasmic NH4+. Complementation with wild-type CAP1 restored normal growth, confirming its role. The findings underscored CAP1's importance in NH4+ detoxification and root hair development through calcium signaling and nutrient uptake.
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