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. 2020 Oct 2;15(10):1794394.
doi: 10.1080/15592324.2020.1794394. Epub 2020 Jul 20.

Nitrate deficiency induces differential endocytosis in roots through NRT1.1

Sen Chai  1   2 , Yongxin Nie  1 , Sha Li  1
Affiliations

Nitrate deficiency induces differential endocytosis in roots through NRT1.1

Sen Chai et al. Plant Signal Behav. .

Abstract

Roots grow asymmetrically, sometimes helically, around their growth direction likely to facilitate environmental sensing. We recently demonstrated that nitrate deficiency induces root coiling on horizontal surface through nitrate transporter/sensor NRT1.1 and PIN2- and AUX-mediated polar auxin transport. Here, we show that nitrate deficiency or NRT1.1 loss-of-function induces differential distribution of PIN2 between the future concave and concave sides in root epidermal cells. Treatment with pharmacological drugs suggests that enhanced endocytosis at the future convex side leads to reduced plasma membrane (PM) association of PIN2. A reduction of PIN2 at the PM would maintain a low auxin response to further enhance endocytosis at the convex side, leading to root coiling.

Keywords: BFA; Nitrate; asymmetric root growth; auxin; endocytosis.

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Figures

Figure 1.
Figure 1.
Nitrate deficiency induces differential dynamic distribution of PIN2 in horizontally placed roots.
Figure 2.
Figure 2.
Chl1‐5 shows differential dynamic distribution of PIN2 in horizontally placed roots.
See this image and copyright information in PMC

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