晩抽型ホウレン草の開花促進に関する研究-3-
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概要
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1. In order to obtain the basic data for seed pro-duction in slow bolting spinach (var. King of Den-mark), the author studied the flowering behavior on varying planting date and the influence of ver-nalization on the photoperiodic response of spinach under varying daylength. Unvernalized spinach seeds were sown in soil of clay pots placed in greenhouse on the 20th each month. The plants grown from seeds which were treated with vernali-zation temperature of 2±1°C, for periods of 0, 1, 2 and 4 weeks, were exposed to daylength of 8, 10_??_14 (natural daylength in autumn or spring) and 24 hours (supplemented with artificial illumi-nation). 2. Seed vernalized at 2±1°C, resulted in plants which initiated flower buds or open flowers sooner, or at higher percentages, at all photoperiods above 8-hours in greenhouse. The longer the chilling peri-od or daylength, the greater the acceleration of flowering. 3. The reproductive development of unvernalized plants grown under continuous light was accelerat-ed to the same degree as those exposed cold tempe-ratures. From these facts, it will be assumed that the both factors, the chilling of seeds and continu-ous illuminations, may have been acting to flower induction of spinach to the same degree. 4. The after effects of vernalization treatment may alter the photoperiodic responses of this crop, and the critical photoperiod necessary to flowering in this variety was found to be beneath 13 to 8 hours, as a result of vernalization. 5. The possibilities in seed production of King of Denmark planted in autumn (from Sept. to Nov.) seemed very little due to abnormal flowering and fruiting induced from older stocks.
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