国产鸡血藤属和崖豆藤属(豆科)的花粉形态及其系统学意义

Pollen Morphology of Callerya Endl. and Millettia Wight et Arn. (Leguminosae) from China and Its Systematic Implications

摘要:

为探讨国产豆科（Leguminosae）鸡血藤属（Callerya Endl.）和崖豆藤属（Millettia Wight et Arn.）的属间和属下分类，在扫描电镜下观察了鸡血藤属11种5变种和崖豆藤属6种2变种的花粉形态。结果表明，鸡血藤属和崖豆藤属植物的花粉都是3孔沟或3沟的单粒，辐射对称，赤道面观主要为类球形或近扁球形，极面观主要为圆形或圆状三角形。鸡血藤属植物的花粉大小为中等，而崖豆藤属的为小型。两属植物花粉的沟膜呈现或多或少的隆起或凹陷，附有细微的或粗糙的颗粒，花粉外壁纹饰可分为6种类型。花粉形态不支持Schot合并所有灰毛鸡血藤复合体中除了亮叶鸡血藤[C.nitida（Benth.） R.Geesink]与喙果鸡血藤[C.cochinchinensis（F.P.Metcalf） Z.Wei&Pedley]为灰毛鸡血藤[C.cinerea（Benth.） Schot]的观点，花粉大小支持将鸡血藤属从广义崖豆藤属中分离。

关键词:鸡血藤属;崖豆藤属;花粉;扫描电镜;分类学

Abstract:

In order to discuss the inter-and sub-generic classification of Callerya Endl. and Millettia Wight et Arn. (Leguminosa) from China, the pollen morphology of 11 species, 5 varieties of Callerya and 6 species, 2 varieties of Millettia were observed under scanning electron microscopy. The results showed that pollen grains of Callerya and Millettia were monads, tricolporate or tricolpate, radiosymmetric, mainly spheroidal and suboblate in equatorial view, circular or rounded triangular in polar view. The pollen of Callerya was medium in size, whereas those of Millettia were small. The colpus membrane of both genera pollen was more or less raised or sunken, with finely or coarsely granular. There were six exine ornamentation types in pollen of Callerya & Millettia. Therefore, based on pollen morphology, Schot's hypothesis was not supported which combine all Callerya cinerea-complex species except for C. nitida and C. cochinchinensis into C. cinerea, and it was congruent with recent phylogenetic studies which separating Callerya from Millettia s. l. from pollen sizes.

Key words:Callerya;Millettia;Pollen;SEM;Taxonomy