ササユリ自生系統間の交雑親和性と交雑後代の開花特性(育種・遺伝資源)  [in Japanese] Cross-compatibility within and between Accessions of Lilium japonicum Thunb., and Flowering Habits of the Progeny(Breeding & Germplasm Resource)  [in Japanese]

38箇所の自生地から収集したササユリとその栄養繁殖個体を自然集団を反映する系統(自生系統)と見なし交雑親和性を調べた.その結果,いずれの自生系統も自家親和性は低いが,同じ自生地から得た母球を異にする系統間の交配では交雑親和性が高かった.自生地を異にする自生系統間の交配では,九州地方および四国地方東部に由来の自生系統と,四国地方東部に自生する変種ジンリョウユリはその他の地域の自生系統と交雑親和性が著しく低いことが明らかになった.交雑試験で得られた種子を無菌培養して得た小球を3年間栽培したところ,近畿地方南部の系統内交配に由来する実生1個体が栽培1年目で開花した.また,胚珠親に近畿地方南部,花粉親に四国地方東部の系統を用いた交配で得られた後代実生に多花性を示す傾向が認められた.開花の早晩性については,交配親の早晩性を量的に受け継いだ.

Artificial cross experiments were carried out to determine cross-compatibility within and between 38 accessions from natural populations of Lilium japonicum. Results of the cross experiments showed that plants from the Kyushu district and the eastern part of the Shikoku district, and those of L. japonicum var. abeanum, native in the eastern part of the Shikoku district, are less compatible with plants from other districts. To examine flowering characteristics of the progenies derived from artificial crosses, seedlings were established from the obtained seeds through aseptic culture. Only one progeny derived from a cross within an accession from the southern Kinki district reached flowering during the first year of cultivation. Progenies from crosses between accessions from the southern Kinki district and eastern Shikoku district tended to differentiate more flowers than other progenies during the third year of cultivation. Flowering time of parents used in the crosses seemed to be quantitatively reflected in that of their progenies.