18.キュウリ芽生えの重力形態形成に伴うCsPIN1の局在変動とIAA動態変化の解析(口頭発表)

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When cucumber seeds germinate in a horizontal position, resulting seedlings develop a specialized protuberance, termed the peg, on the lower side of the root-hypocotyl transition zone, due to gravistimulation. We have shown that exogenously applied auxin induces peg formation and that content of a free form of auxin, indole-3-acetic acid (IAA), in the upper side of the gravistimulated transition zone is less than that in the lower side. In addition, we have shown that auxin efflux carrier CsPIN1 proteins are expressed in endodermal cells and after 120min gravistimulation, the localization pattern of CsPIN1 changed to transport more auxin to lower side than upper side. To reveal the contribution of CsPIN1 to auxin dynamics during gravistimulation in the transition zone, we analyzed the content and distribution of endogenous IAA in the gravistimulated transition zone. After 30min gravistimulation, a significant accumulation in IAA content was detected in lower side of transition zone compared with its upper side. In addition, our immunohistochemical analysis using anti-IAA antibody revealed that the distribution of IAA-signals changed within 2min after gravistimulation. These results suggest that during peg formation, the change in localization pattern of CsPIN1 due to gravistimulation has the secondary effect and the other mechanisms exist to induce an immediate asymmetric IAA distribution in the transition zone of cucumber seedlings.
植物化学調節学会の論文
2009-10-06

18.キュウリ芽生えの重力形態形成に伴うCsPIN1の局在変動とIAA動態変化の解析(口頭発表)

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