Development of a laboratory work for confirming that water is absorbed through rhizoids of Bryophyte

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  • コケ植物における仮根からの水分吸収を確認する生徒実験の開発
  • コケ ショクブツ ニ オケル カリ コン カラ ノ スイブン キュウシュウ オ カクニン スル セイト ジッケン ノ カイハツ

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<p>Laboratory work for confirming whether rhizoids of bryophytes to can absorb water or not was developed using a riboflavin (vitaminB2) solution and UV light (352 nm) for science classes in lower secondary schools. After newly elongated rhizoids of bryophytes, Pogonatum inflexum, Plagiomnium acutum, Marchantia polymorpha and Conocephalum conicum, were immersed in a 0.05% riboflavin solution for several hours, both the top of stem of Pogonatum and Plagiomnium and the top of thallus of Marchantia and Conocephalum became fluorescent under UV-light. These results indicate that riboflavin solution was absorbed through their rhizoids, and reached the top of the plant body. In current science textbooks in lower secondary schools in Japan, only the function of rhizoids of bryophyte, “Adhesion to substrates”, is described, while learners can confirm by themselves another function of rhizoids, “Absorption of water”, through the simple laboratory work described in this paper.</p>

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