A study on breeding of freesia, <i>Freesia refracta</i> KLATT

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  • ITO A.
    静岡県農業試験場遠州園芸分場

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  • フリージアの育種学的研究
  • フリージア ノ イクシュガクテキ ケンキュウ
  • A study on breeding of freesia, Freesia refracta KLATT

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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.<br> 1. The optimum temperature for seed germina-tion of freesia is 15°C. No germination takes place at temperatures higher than 25°C.<br> 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.<br> 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.<br> 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.<br> 5. Freesia, Super Giant, is a cross-pollinated plant consequently the inbreeding depressions are found clearly on several characters.<br> 6. Some possible methods for further breeding are discussed.

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