Abstract
1. On account of flower forcing of the stocks, studies on flower bud differentiation and development were conducted at Nagano 1951 and 1952, using the seedlings which were grown on the regions of the high altitude and received different growing temperatures.
2. Flower clusters differentiated aside the growing point axis which were developing. Flower clusters which had been differentiated developed to flower buds and flowered when the circumstances were favorable.
3. Stock seedlings which were moved to high temperature suddenly soon after the flower clusters differentiation, developed imperfect flower buds e. g. aborted, or deformed flower, etc.
4. To avoid of these imperfect flower buds, the seedlings which had differentiated to the flower clusters perfectly should be used.
5. For this reason, the seedlings should be received low temperature over 35-40 days below 13°C min.
6. Seedlings which had been grown at the regions of high altitude, might be forced of the flowers ahead 30 days compared to the ones grown at the low altitude. The seedlings of Non-Branching strains were forced 50 days ahead.
7. Flower stalks were too dwarf for cut flowers when the seedlings had been grown at too cool region of high altitude. The length of flower stalks was correlated to the dimensions of seedlings at the time the flower buds differentiated. It should be sown 50 to 60 days ahead the time of flower cluster differentiation and grown up to longer seedlings to secure tall flower stalks.
8. To secure the cut flowers of stocks at X-mas, it should be sown in July 10 to 20 at 700 to 800 meters altitude and then moved the seedlings to warm regions or house early in October.
