温度要因がホテイアオイの生育及び繁殖に及ぼす影響

概要

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Effect of temperature (15℃, 20℃, 25℃ and 30℃) on the growth and reproduction of both seedling and adult plants of Eichhornia crassipes was examined. 1. At 30℃ and 25℃, the growth of new plants produced from the seedling plants was extremely vigorous, while the seedling plants produced more new plants at 20℃ than at the other temperatures (Table 2). The optimum temperature for the growth of the seedling plants ranged from 20℃ to 30℃ (Table 1). 2. The period of inflorescence formation was earlier and the number of inflorescences was greater at 30℃ and 25℃ than at 20℃ in the seedling plants (Fig. 1). There was a close relationship between the number of inflorescences and the number of new plants produced at 30℃ and 25℃ (Fig. 2). 3. Increase in dry matter weight of adult plants was significantly affected by temperature, the maximum increase being observed between 25℃ and 30℃ (Table 3). 4. Adult plants produced a larger number of new small plants at lower temperatures than at higher temperatures, though the growth of the new plants was inhibited at lower temperatures, as observed in the seedling plants (Fig. 3 and Table 4). Also adult plants produced more inflorescences at higher temperatures (Fig. 4).
日本雑草学会の論文
1984-05-25