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How do plants space out their roots? A Japanese research team has identified a peptide and its receptor that help lateral roots to grow with the right spacing. The findings were published on December 20, 2018 in the online edition of Developmental Cell.
The team was led by Professor Hidehiro Fukaki (Graduate School of Science, Kobe University), Researcher Koichi Toyokura (currently JSPS Research Fellow at Osaka University) and Project Assistant Professor Tatsuaki Goh (currently Assistant Professor at the Nara Institute of Science and Technology) in collaboration with Professor Yoshikatsu Matsubayashi and Assistant Professor Hidefumi Shinohara (both from Nagoya University) and other researchers from the Nara Institute of Science and Technology, Associated Professor Koichi Fujimoto (Osaka University) and Assistant Professor Yuki Kondo (the University of Tokyo).
Plant - Root - Systems - Roots - Tissue
Plant root systems are mainly shaped by the lateral roots that grow from tissue inside the existing roots. These roots form from "lateral root founder cells" that are positioned at regularly-spaced intervals at a distance from the meristem tissue (tissue responsible for growth). Previous studies using Arabidopsis plants showed that lateral root founder cells are made from sites where there is high response to the chemical auxin, and indicated that transcription factor LBD16 induced by auxin may inhibit the cells near lateral root founder cells from forming roots.
This time, a joint research team, using plant model Arabidopsis, searched for the gene that is activated by transcription factor LBD16 and successfully identified the TOLS2 gene. The TOLS2 gene is mainly expressed in lateral root founder cells and root germs. In Arabidopsis plants that overexpress TOLS2, the number of lateral roots decreases (figure 1), indicating that the TOLS2 gene can inhibit the formation of lateral root founder cells. The team analyzed secretions from plants...
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