洋菜類の生態に関する研究-3-レタスの花芽分化,抽台,出らいおよび開花期に及ぼす温度処理の影響について
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概要
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1. The main object of the present investigation was to study the effects of combination of temperatures at the stage of seedling on flower bud differentiation, bolting, budding and flowering time in head lettuce.2. Seedlings with 5 leaves (31 days after sowing) were previously treated with 10°C, 15°C, 20°C and 25°C for 20 days, respectively. The plants treated with 10°C continued vegetative growth by the end of treatment. Those with 15°C were just on turning point from vegetative to reproductive growth. On the other hand, both of the plants treated with 20°C and 25°C differentiated flower buds at their growing points.3. The plants previously treated as mentioned above were transferred to 10°C, 15°C, 20°C and 25°C, respectevely. As a result, the plants treated with higher post temperature were promoted the flower bud differentiation or its development, regardless of their previous temperature treatments.4. Degree of seedstalk elongation was classified into I-IV as shown in Fig. 1, and it was highly correlated with flower bud development. As the flower bud development and bolting stage made progress, the degree of seedstalk elongation advanced from I to IV.5. The earier flower bud differentiation caused by higher temperature treatment accompanied with the greater number of leaves on main seedstalk, and also with slightly increased final number of leaves in the whole plant.6. The higher the temperature of treatment was, the longer the seedstalk elongation. However, post temperature treatment is more effective on seedstalk elongation than previous temperature treatment.7. The effect of combination of temperature treatments on bolting and flowering was parallel to that on flower bud differentiation.8. It may not be concluded, however, that there is a relationship between summation of temperature and flower induction in head lettuce.
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