Photosynthetic Characteristics of an Amphibious C_4 Plant, Eleocharis retroflexa ssp.chaetaria

概要

論文の詳細を見る
Eleocharis retroflexa(Poir.)Urban ssp.chaetaria(Roem.& Schult.)T.Koyama, an amphibious leafless sedge, grows not only under terrestrial conditions but also under completely submerged aquatic conditions. We investigated the photosynthetic traits and structural features of the culms, which are the photosynthetic organs, in the terrestrial and submerged forms of this species and compared them with those of other amphibious species of Eleocharis which are known to change the photosynthetic modes. The culms of the terrestrial form had Kranz anatomy with well-developed Kranz(bundle sheath)cells and high levels of C_4 enzyme activity typical of the NAD-malic enzyme(NAD-ME)subtype of C_4 metabolism. They also had a δ ^<13>C value typical of C_4 plants, indicating that the terrestrial form fixes carbon through the C_4 pathway. The culms of the submerged form had not only a Kranz-like anatomy but also revealed anatomical traits typical of leaves of submerged aquatic plants. The activities of the C_4 enzymes in the submerged form were lower than those in the terrestrial form, but were still in the range typical of C_4 plants. ^<14>C pulse-^<12>C chase experiments with the submerged form indicated that almost all of the fixed ^<14>C was incorporated into C_4 compounds, and subsequently the raioactivity was transferred into C_3 compounds and sucrose. The submerged form showed no diurnal fluctuation in malate level. These data demonstrate that a C_4 metabolism is operative even in the submerged form. Thes unique amphibious C_4 plant provides an intriguing example of the physiological and ecological adaptability of C_4 plants.
日本作物学会の論文

Photosynthetic Characteristics of an Amphibious C_4 Plant, Eleocharis retroflexa ssp.chaetaria

スポンサーリンク

概要

著者

関連論文

スポンサーリンク