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Contribution of Root Hair Development to Sulfate Uptake in Arabidopsis

1
Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
2
Graduate School of Biosphere Sciences, Hiroshima University, 1-4-4 Kagamiyama, Higashi Hiroshima, Hiroshima 739-8528, Japan
*
Author to whom correspondence should be addressed.
Plants 2019, 8(4), 106; https://doi.org/10.3390/plants8040106
Received: 26 February 2019 / Revised: 15 April 2019 / Accepted: 17 April 2019 / Published: 19 April 2019
(This article belongs to the Special Issue Advances in Plant Sulfur Research)
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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. View Full-Text
Keywords: Arabidopsis thaliana; root hair; sulfate transporter; sulfate uptake; CPC; CAPRICE; WER; WERWOLF Arabidopsis thaliana; root hair; sulfate transporter; sulfate uptake; CPC; CAPRICE; WER; WERWOLF
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Kimura, Y.; Ushiwatari, T.; Suyama, A.; Tominaga-Wada, R.; Wada, T.; Maruyama-Nakashita, A. Contribution of Root Hair Development to Sulfate Uptake in Arabidopsis. Plants 2019, 8, 106.

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