Variations in Some Morphological and Pigmental Characteristics in Rhododendron kaempferi Planch., R. kiusianum Makino and Their Natural Hybrids on Kirishima Mountain Mass
Variations in Some Morphological and Pigmental Characteristics in Rhododendron kaempferi Planch., R. kiusianum Makino and Their Natural Hybrids on Kirishima Mountain Mass
复制标题
雾岛山地山山杜鹃、牧野杜鹃及其天然杂交种形态和色素特征的变化
DOI：
10.2503/jjshs.61.925
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发表时间：
1993
影响因子：
--
通讯作者：
K. Arisumi
中科院分区：
文献类型：
--
作者：
Y. Sakata;I. Miyajima;K. Arisumi
日本杜鹃位于基里什岛山体脚下，花色和花瓣斑点表现出较小的变异范围，除花朵大小变化较大外，花朵呈朱红色，花斑明显。花瓣的化学着色也表现出很小的变异范围。仅观察到花青素系列的花青素。此外，在山体的顶端，红曲霉的变异范围很小，开出的花很小，完全是紫色的，几乎没有斑点。很少观察到化学色素的变化。在所有个体中都存在飞雀素系列的花青素和5-甲基黄酮醇。另一方面，山体斜坡上的杜鹃花表现出广泛的表型特征。花色从朱红到粉红色到紫色不等，花径16~60 mm，花瓣斑点表现多样。至于化学色素沉着，差异很大。此外，这些杜鹃花的表型和色素特征因其栖息地的海拔而异。海拔越低，杜鹃花越接近山杜鹃，而海拔越高，杜鹃花越接近东北杜鹃花.鉴于山顶杜鹃的表型特征和色素特征非常广泛，而且随着海拔的升高，山顶杜鹃花的表型特征和色素特征从山顶杜鹃的中间型转变为金叶杜鹃的特征，因此山坡上的杜鹃花似乎是山顶杜鹃和金叶杜鹃自然杂交的结果.
Rhododendron kaempferi Planch., at the foot of the Kirishima mountain mass, exhibited narrow range of variations in flower colour and petal blotch expression, producing vermilion shaded flowers with prominent blotches, except for the flower size showing a wide range of variation. Petal chemical pigmentation also showed a narrow range of variation. Anthocyanin of the cyanidin series was only observed. In addition, at the summit of the mountain mass, R. kiusianum Makino occurred with narrow range of variations, producing small, exclusively purple and almost blotchless flowers. Variations in chemical pigmentation were rarely observed. Anthocyanins of the delphinidin series and 5-methylated flavonols occurred in all individuals.On the other hand, azaleas on the slopes of the mountain mass showed wide phenotypic characteristics. The flower colour ranged from vermilion through pink to purple, the flower size ranged in diameter from 16 to 60 mm and the petal blotch expression was diverse. As regards chemical pigmentation, a wide range of variation was apparent. Moreover, phenotypic and pigmental characteristics of these azaleas varied according to the altitude of their habitats. The lower the altitude, the more the azaleas became similar to R. kaempferi, while the higher the altitude, the azaleas came to resemble R. kiusianum more closely.In view of the extremely wide phenotypic and pigmental characteristics, and the changes in the characteristics from those of R. kaempferi through the intermediate forms to those of R. kiusianum as altitude increased, azaleas on the slopes of the mountain seemed to be the result of natural hybridization between R. kaempferi and R. kiusianum.