3. キュウリの芽ばえの重力形態形成におけるオーキシン排出キャリアの役割

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Plant response to gravity is an important adaptive strategy to survive their environments. We have investigated the mechanism of the gravity response using cucumber seedlings. When cucumber seeds germinate in a horizontal position, a protuberance called a peg forms on the lower side of the transition zone between the root and the hypocotyl. The peg helps the cotyledons and the plumule to pull themselves out from the seed coat. In space-flight experiments, we found that cucumber seedlings grown in microgravity developed a peg on each side of the transition zone. This result suggests that gravity response results in the suppression of peg formation on the upper side of transition zone on Earth. It has been shown that auxin induces peg formation. When cucumber seedlings were treated with inhibitors of auxin efflux carrier, a peg was formed not only on the lower side but also on the upper side of the transition zone, suggesting that activation of auxin efflux carriers is required for the suppression of peg formation. To identify auxin efflux carriers involved in suppression of peg formation by graviresponse, we isolated 6 cucumber cDNAs of PIN auxin efflux carrier genes and investigated their mRNA accumulation by in situ hybridization. Our results showed that mRNAs of CsPIN1 and CsPIN6 accumulate in several tissues including endodermis postulated to be gravisensing cells, suggesting that CsPIN1 and CsPIN6 could play a role in the gravity-response of the transition zone.
2005-10-13

3. キュウリの芽ばえの重力形態形成におけるオーキシン排出キャリアの役割

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