Contribution of Root Hair Development to Sulfate Uptake in Arabidopsis
Yuki Kimura | Tsukasa Ushiwatari | Akiko Suyama | Rumi Tominaga-Wada | Takuji Wada | Akiko Maruyama-Nakashita
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 (&minus: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 &minus:S. Under &minus:S, the expression of SULTR1:1 and SULTR1:2 was negatively correlated with the number of root hairs. These results suggest that both &minus: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 &minus:S than under +S. These observations suggested that under both +S and &minus:S, sulfate uptake was influenced by the root biomass rather than the number of root hairs.
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