IBIP seminar – MISTRAL Summer School
Tuesday, July 12, 2016
Pr. Toru Fujiwara
Laboratory of Plant Nutrition and Fertilizers, Graduate School of Agricultural and Life Sciences, University of Tokyo, Japan
Boron transport in plants (1): Mechanisms of B-dependent regulation of transporter expression and localization
Boron (B) is an essential element for plants and for plants it is essential to maintain B homeostasis. For this transport processes need to be regulated in accordance with the B condition in soils/media. Many members of two major types of boron transporters, BORs and NIPs, are regulated in B-dependent manners, but the mechanisms of regulation different. In this talk, I would like to introduce mechanisms of regulating accumulation of BORs and NIPs in response to B conditions in the media. Regulation of BOR1 mainly occurs at the levels of protein degradation, while NIP5;1 is regulated at the level of mRNA accumulation. We recently found a unique role of ribosome in regulating NIP5;1 mRNA accumulation in a B dependent manner.
Boron transport in plants (2): Mathematical modelling and boron distribution in roots
For the understanding of B homeostasis in plants, understanding of the regulation of each members of boron transporter is not sufficient. Plants have several different boron transporters whose accumulation patterns and regulation mechanisms are different. For example, NIP5;1 is a boric acid channel, which facilitate boron permeation across plasma membrane, while. BOR1 and BOR2 are is boric acid exporters. NIP5;1 and BORs have “outer” and “inner” localization patterns, respectively. It is likely that B concentration in cells are affecting BOR and NIP5;1 accumulation and vice versa. I would like to present our trial to comprehensively understand the overall B transport/distribution in A. thaliana roots through mathematical modelling, in combination with B distribution analysis using Laser-Ablation ICP-MS.