フリージアの育種学的研究

概要

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This experiment was carried out to study the physiological problems of seed germination and ge-netical feature in freesia, especially paying atten-tion to the seed-strain freesia, Super Giant, from the breeding view point. 1. The optimum temperature for seed germina-tion of freesia is 15°C. No germination takes place at temperatures higher than 25°C. 2, The germinating behavior is very irregular, the duration extending over a long period. This irregular germination may be caused by several environmental factors and genetical factors. 3. The seeds of seed-strain freesia, Super Giant, has weak dormancy as compared with Alba var. and the seedlings of Super Giant grow taller than the Alba seedlings. The time of flower bud differ-entiation is later in Super Giant seedlings than that of Alba regardless to the sowing time. 4. Super Giant seedlings show great variations in various characters such as flowering date, stem length, flower diameter and corolla type. Correla-tion coefficients among these characters are gener-ally low, though they show significant correlation in some cases. Their heritability are also generally low, showing that the greater parts of variations may be due to environmental factors. 5. Freesia, Super Giant, is a cross-pollinated plant consequently the inbreeding depressions are found clearly on several characters. 6. Some possible methods for further breeding are discussed.
園芸学会の論文