ヒエ属多年生種,Echinochloa stagnina (Retz.) Beauv. とE. picta (Koen.) Michaelの浮性

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The floating habit of perennial strains of Echinochloa stagnina and E. picta with different ploidy levels (Table 1) was investigated by sinking them in water at 3 different levels, 0 (control), 4 and 8cm per day for 20 days. The floating ability widely varied among the strains. Two West African strains of E. stagnina showed a higher floating ability than the Southeast Asian strains of E. stagnina and E. picta, while the Philippines strain of E. stagnina and the Sri Lanka strain of E. picta showed an exceedingly low floating ability (Table 2). The variation of the floating ability among the strains may correspond to the modes of increase of the water depth in their native habitats. The survival nuder experimental flooding conditions was closely correlated with the ability of internode elongation and of adventitious root formation of the nodes (Table 3). The flooding stress and damage to plant considerably promoted shoot emergence from node (Fig. 2 and Table 2), and the node of the excised culm segment exhibited a good regeneration (Fig. 3). These characteristics along with the particularities of the node reaction may play significant role in the reservation of the genotype under the rapid increase of the water level and against the damage due to flooding. On the other hand the strains with a higher floating ability showed lower ratio for the dry weight of nodes to that of culm than those with a low floating ability (Table 4).
日本雑草学会の論文
1986-08-26

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