Contribution of Root Hair Development to Sulfate Uptake in Arabidopsis.

Kimura, Yuki; Ushiwatari, Tsukasa; Suyama, Akiko; Tominaga-Wada, Rumi; Wada, Takuji; Maruyama-Nakashita, Akiko

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.

ARABIDOPSIS thaliana; ROOT hairs (Botany); PLANT roots; PLANT nutrients; NUTRIENT uptake

Plants (2223-7747), 2019, Vol 8, Issue 4, p106

2223-7747

Academic Journal

10.3390/plants8040106