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Plants (Basel). 2019 Apr 19;8(4). pii: E106. doi: 10.3390/plants8040106.

Contribution of Root Hair Development to Sulfate Uptake in Arabidopsis.

Author information

1
Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. YukiKimura@gmail.com.
2
Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. 2BE18410P@s.kyushu-u.ac.jp.
3
Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. aksuyama@nm.beppu-u.ac.jp.
4
Graduate School of Biosphere Sciences, Hiroshima University, 1-4-4 Kagamiyama, Higashi Hiroshima, Hiroshima 739-8528, Japan. rtomi@hiroshima-u.ac.jp.
5
Graduate School of Biosphere Sciences, Hiroshima University, 1-4-4 Kagamiyama, Higashi Hiroshima, Hiroshima 739-8528, Japan. twada86@hiroshima-u.ac.jp.
6
Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. amaru@agr.kyushu-u.ac.jp.

Abstract

Root hairs often contribute to nutrient uptake from environments, but the contribution varies among nutrients. In Arabidopsis, two high-affinity sulfate transporters, SULTR1;1 and SULTR1;2, are responsible for sulfate uptake by roots. Their increased expression under sulfur deficiency (-S) stimulates sulfate uptake. Inspired by the higher and lower expression, respectively, of SULTR1;1 in mutants with more (werwolf [wer]) and fewer (caprice [cpc]) root hairs, we examined the contribution of root hairs to sulfate uptake. Sulfate uptake rates were similar among plant lines under both sulfur sufficiency (+S) and -S. Under -S, the expression of SULTR1;1 and SULTR1;2 was negatively correlated with the number of root hairs. These results suggest that both -S-induced SULTR expression and sulfate uptake rates were independent of the number of root hairs. In addition, we observed (1) a negative correlation between primary root lengths and number of root hairs and (2) a greater number of root hairs under -S than under +S. These observations suggested that under both +S and -S, sulfate uptake was influenced by the root biomass rather than the number of root hairs.

KEYWORDS:

Arabidopsis thaliana; CAPRICE; CPC; WER; WERWOLF; root hair; sulfate transporter; sulfate uptake

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