主要畑夏雑草の生育特性, 特に出穂・着蕾に及ぼす日長および温度条件の影響

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The effect of photoperiod and temperature on the growth, especially heading or flower bud appearance of 13 species of the main upland weeds in the Kanto plain was investigated using a phytotron. The results are as follows; 1) Thirteen species were classified into 3 photoperiodic groups, as follows; Qualitative short-day weeds; Chenopodium album L., C. album L. var. centrorubrum Makino Quantitative short-day weed; Setaria viridis Beauv., Digitaria ciliaris, Echinochloa crus-galli Beauv., Cyperus microiroa, Amaranthus patulus, Eclipta prostrata L. Day-neutral weeds; Portulaca oleracea L., Polygonum persicaria L., Eleusine indica, Amaranthus lividus L., Commelina communis L. The number of days from seeding to flower bud appearance was reduced by short day-length conditions in Portulaca oleracea and Polygonum persicaria within the day-neutral group. 2) The morphological growth type changed significantly in the qualitative short-day and quantitative short-day groups under different daylength conditions. The number of branches or ears increased and the plant length or stem length decreased under short daylength conditions in the qualitative short-day and quantitative short-day groups. Opposite results were observed under long daylength conditions. On the other hand, the changes of the morphological growth type under different daylength conditions were not as conspicuous in the day-neutral group. 3) The number of days from seeding to heading or flower bud appearance was reduced in the plot under short daylength conditions during some time after seeding following long daylength conditions compared with long daylength conditions after seeding following short daylength conditions, and the top dry weight increased remarkably in the latter plot. 4) The number of days from seeding to heading or flower bud appearance increased under low temperature conditions such as 15℃ as compared to 20 or 30℃ 5) The relationship between the photoperiodic response and basic vegetative growth or reproductive effort was discussed.
日本雑草学会の論文
1991-04-08

主要畑夏雑草の生育特性, 特に出穂・着蕾に及ぼす日長および温度条件の影響

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