TY - JOUR
T1 - MIZU-KUSSEI1 plays an essential role in the hydrotropism of lateral roots in Arabidopsis thaliana
AU - Iwata, Satoru
AU - Miyazawa, Yutaka
AU - Takahashi, Hideyuki
N1 - Funding Information:
We thank our laboratory members Mr. Teppei Moriwaki for his technical suggestions and Dr. Nobuharu Fujii for helpful discussions. This work was supported by a Grant-in-Aid for Scientific Research B (No. 20370017 ) from JSPS , a Grant-in-Aid for Scientific Research on Innovative Areas (No. 22120004 ) from the MEXT , and the Global COE Program J03 (Ecosystem Management Adapting to Global Change) of the MEXT to H.T. Y.M. is supported by the Funding Program for Next-Generation World-Leading Researchers ( GS002 ). This work was carried out as a part of the “Ground-based Research Announcement for Space Utilization”, promoted by the Japan Space Forum.
PY - 2012/1
Y1 - 2012/1
N2 - Root hydrotropism is the directional growth of roots toward a source of moisture in response to a water potential gradient. Root hydrotropism is therefore one of the most important factors for efficient water acquisition under water-limited conditions. However, the mechanisms underlying hydrotropism are not well understood. A previous study of the hydrotropism of primary roots in Arabidopsis thaliana identified the MIZU-KUSSEI (MIZ) 1 and MIZ2 genes as essential for this process. However, despite the important role of lateral roots in water acquisition under water deficient conditions, the mechanism of hydrotropism in lateral roots has not been investigated to date. The present study established an experimental system for the induction of lateral root hydrotropism in Arabidopsis and analyzed its characteristics in comparison with those of primary roots. Lateral roots were found to exhibit hydrotropism irrespective of their length. Expression of a pMIZ1::. GUS fusion gene at the tip of lateral roots and assessment of lateral root hydrotropism in the ahydrotropic mutant miz1, which did not display hydrotropism, demonstrated that the lateral roots of Arabidopsis have the capacity to respond to water potential gradients, and that this activity is regulated by MIZ1.
AB - Root hydrotropism is the directional growth of roots toward a source of moisture in response to a water potential gradient. Root hydrotropism is therefore one of the most important factors for efficient water acquisition under water-limited conditions. However, the mechanisms underlying hydrotropism are not well understood. A previous study of the hydrotropism of primary roots in Arabidopsis thaliana identified the MIZU-KUSSEI (MIZ) 1 and MIZ2 genes as essential for this process. However, despite the important role of lateral roots in water acquisition under water deficient conditions, the mechanism of hydrotropism in lateral roots has not been investigated to date. The present study established an experimental system for the induction of lateral root hydrotropism in Arabidopsis and analyzed its characteristics in comparison with those of primary roots. Lateral roots were found to exhibit hydrotropism irrespective of their length. Expression of a pMIZ1::. GUS fusion gene at the tip of lateral roots and assessment of lateral root hydrotropism in the ahydrotropic mutant miz1, which did not display hydrotropism, demonstrated that the lateral roots of Arabidopsis have the capacity to respond to water potential gradients, and that this activity is regulated by MIZ1.
KW - Arabidopsis thaliana
KW - Hydrotropism
KW - Lateral root
KW - MIZU-KUSSEI1 (MIZ1)
KW - Tropism
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U2 - 10.1016/j.envexpbot.2011.09.007
DO - 10.1016/j.envexpbot.2011.09.007
M3 - Article
AN - SCOPUS:80053925535
VL - 75
SP - 167
EP - 172
JO - Environmental and Experimental Botany
JF - Environmental and Experimental Botany
SN - 0098-8472
ER -