The analysis of auxin function in reconstruction of cell wall polysaccharide by hyper gravity.

2016 Fiscal Year Final Research Report

• Project/Area Number: 26506015
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: 宇宙生命学
• Research Institution: The University of Tokyo
• Principal Investigator: Suzuki Masashi 東京大学, 大学院農学生命科学研究科(農学部), 特任助教 (30342801)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: オーキシン / 細胞壁 / 重力 / シロイヌナズナ / 支持領域 / 伸長領域

Outline of Final Research Achievements

The elongation of floral stem of Arabidopsis was inhibited by hyper-gravity. The expression of Aux/IAA19, an auxin responsive gene, was also inhibited by hyper-gravity. Auxin is known to loosen cell wall. From these results, we speculated that hyper-gravity down regulates auxin and then the elongation of floral stem of Arabidopsis was inhibited by down regulated auxin signal. However, molecular sizes of xyloglucan were not different between wild type and auxin accumulated mutant. To understand the relationship between auxin and reconstruction of cell wall polysaccharide and cell elongation on gravity resistance, more detailed analyses have to be performed.
On the other hands, the expression of some genes encoding cytoskeletal proteins, such as myosins, was affected by hyper-gravity. We consider that the total analyses of gravity resistance system including cytoskeleton is important.

Free Research Field

植物分子生物学・分子遺伝学