Research Project
Grant-in-Aid for Challenging Exploratory Research
The co-transport system is known to be H+-coupling or Na+-coupling. The phosphate transport system of Chara braunii which is supposed to be the ancester of land-plants, is Na+ co-transport type. In order to clarify the evolution of this co-transport system, we aimed to analyze the molecular basis and evolution of the co-transport system by using the brackish green algae; Ulva compressa. We found that it can be grown even under Na+-deficient conditions, and the phosphate transport is both H+ type and Na+ type. Transcriptome analysis revealed the presence of two phosphate transporter genes supposed to be in the cell membrane. In further experiment, the Na+ dependency of the phosphate transporter gene of Chara braunii was confirmed using Xenopus unfertilized egg’s system.
生体膜共役輸送系は、栄養の取り込みや老廃物の排出に働き、細胞存続の基盤となる輸送系である。H+共役型とNa+共役型が知られていて、植物と動物を区別する大きな要素である。陸上植物は、H+共役型を持つことが知られている。本研究から陸上植物の祖先種であるシャジクモやアオサ類は、H+型やNa+型を持つことが明らかとなった。これら共役輸送系は、古くはH+共役型から進化したと考えられているが、陸上植物の祖先種の植物群がNa+型も持つことから、これらの共役輸送系がどのように進化してきたのかを、もう一度検討し直すことが必要となる。
All 2018 2017 2016 Other
All Int'l Joint Research (7 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results, Peer Reviewed: 7 results, Open Access: 5 results) Presentation (10 results) (of which Int'l Joint Research: 1 results, Invited: 2 results)
Nature Plants
Volume: 4 Issue: 12 Pages: 1044-1055
10.1038/s41477-018-0291-x
120006627286
Plant and Cell Physiology
Volume: 69 Pages: 1353-1362
10.1093/pcp/pcy069
J. Wood Science
Volume: 64 Issue: 1 Pages: 1-5
10.1007/s10086-017-1664-x
40021470912
Plant Physiol Biochem.
Volume: 114 Pages: 29-37
10.1016/j.plaphy.2017.02.017
Volume: 58 Issue: 8 Pages: 1328-1338
10.1093/pcp/pcx076
120006473630
Plant Cell Physiol.
Volume: 58 Issue: 9 Pages: 1477-1485
10.1093/pcp/pcx106
Frontiers in Plant Science
Volume: 7 Pages: 1143-1143
10.3389/fpls.2016.01143