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

April 2014 in “ The Plant cell ”

Ling Bai, Xiao-Nan Ma, Guozeng Zhang, Shufei Song, Yun Zhou, Lei Gao, Yuchen Miao, Chun‐Peng Song

root hairs ammonium homeostasis cytoplasmic calcium gradients NH4+ Ca2+ CAP1 receptor-like kinase Arabidopsis NH4+ transport vacuole root hair development calcium signaling nutrient uptake ammonium calcium

TLDR The CAP1 gene helps control ammonium levels and is necessary for the proper growth of root hairs in Arabidopsis.

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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research Root Hair Growth in Arabidopsis Thaliana Is Directed by Calcium and an Endogenous Polarity

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

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research Root Hair Growth in Arabidopsis Thaliana Is Directed by Calcium and an Endogenous Polarity

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