EPIPHYTIC NITROGEN FIXATION ON DEEPWATER RICE

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概要

• 論文の詳細を見る

• Epiphytic N_2-fixation in deepwater rice was studied by (1) microscopic examination of the rice plants at different growth stages, (2) measurement of the acetylene-reducing activity (ARA), and N_2-fixing algal enumeration at the heading and maturing stages, and (3) bacterial enumeration at the maturing stage. A high rate of N_2-fixing activity (5.1 μmol・plant^<-1>・hr^<-1>) was observed mainly due to blue-green algae (BGA) which developed preferentially on submerged, decaying tissues of the host. A unique finding was the presence of BGA inside the leaf sheaths. The observations support the idea that the algal epiphytism and endophytism observed on rice are probably related to a mechanical effect, in relation to the roughness of the decaying tissues, rather than biotic relationships. Extrapolation of the N_2-fixing activity to the field scale corresponded to an input of about 10-20 kg N・ha^<-1>・crop^<-1>. It can therefore be concluded that epiphytic N_2-fixation on deepwater rice makes a substantial contribution to the ecosystem.

• 社団法人日本土壌肥料学会の論文

著者

• Barraquio W.l.

  The International Rice Research Institute Los Banos Laguna Philippines

• WATANABE I

  The International Rice Research Institute, Los Banos, Laguna, Philippines

• KULASOORIYA S.A.

  The International Rice Research Institute, Los Banos, Laguna, Philippines

• ROGER P.A.

  The International Rice Research Institute, Los Banos, Laguna, Philippines

• Kulasooriya S.a.

  The International Rice Research Institute Los Banos Laguna Philippines

• Roger P.a.

  The International Rice Research Institute Los Banos Laguna Philippines

関連論文

• OCCURRENCE OF AEROBIC NITROGEN FIXING BACTERIA IN WETLAND AND DRYLAND PLANTS
• EPIPHYTIC NITROGEN FIXATION ON DEEPWATER RICE

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