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Report No.

Identification of the functional tissues for hydrotropism in comparison with those for gravitropism

Miyazawa, Yutaka*; Negishi, Hiroshi*; Sakashita, Tetsuya; Kobayashi, Akie*; Kaneyasu, Tomoko*; Oba, Atsushi*; Funayama, Tomoo; Wada, Seiichi*; Hamada, Nobuyuki*; Kakizaki, Takehiko; Kobayashi, Yasuhiko; Fujii, Nobuharu*; Takahashi, Hideyuki*

Hydrotropism is a response of roots to a moisture gradient. Despite its importance on acquirement of water and nutrients, functional tissue for hydrotropism is hardly uncovered. To approach this problem, we intended to identify the functional tissues responsible for hydrotropism, in comparison with gravitropism. We irradiated either laser beam or heavy-ion beam to root tissues and monitored the changes in tropic responses. Laser beam irradiation to either elongation zone or columella cells resulted in marked decrease in both tropic curvatures. Similar effect was observed when heavy-ion beam was irradiated to elongation zones. Irradiation of either beam to elongation zone resulted in a decrease in root growth. However, the heavy-ion beam irradiation to columella cells affected neither root tropism nor growth. Considering the non-destructive cell inactivation effect of heavy-ion beam, our results suggest that cells in both columella and elongation zone are necessary for expression of both tropisms, but the biological processes that occur inside the respective cells are different.



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