国产爵床科山牵牛属6种、叉柱花属和老鼠簕属各1种植物的花粉形态

报道了国产爵床科Acanthaceae山牵牛属Thunbergia(山牵牛亚科Thunbergioideae)6种、叉柱花属Staurogyne(瘤子草亚科Nelsonioideae)和老鼠簕属Acanthus(老鼠簕亚科Acanthoideae)各1种植物在扫描电镜下的花粉形态。山牵牛属植物的花粉粒为圆球形,均具螺旋状萌发孔,外壁纹饰以光滑或颗粒状为主,偶具棒状突起。具螺旋状萌发孔被认为是该科独特而较原始的花粉特征。叉柱花属的花粉粒为圆球形,具3孔沟,外壁平滑。老鼠簕属的花粉粒为长球形,具3沟,外壁具细网状纹饰或具小穿孔。花粉形态特征支持传统上将上述3属置于3个不同亚科的处理。

Pollen morphology of six species in Thunbergia, of one species each in Staurogyne and Acanthus (Acanthaceae) from China

Pollen grains of six species in Thunbergia (subfamily Thunbergioideae), and of one species each in Staurogyne (subfamily Nelsonioideae) and Acanthus (subfamily Acanthoideae) in the Acanthaceae from China were examined under SEM. Pollen grains in Thunbergia are spheroidal, with the apertures being spiral and the exine ornamentation being psilate, granulate or rarely baculate. This pollen type is very special in this family and has been considered to represent a primitive condition. Pollen grains in Staurogyne are spheroidal, 3-colporate, with the exine ornamentation being psilate. Pollen grains in Acanthus are prolate, 3-colpate, with the exine ornamentation being finely reticulate or microperforate. Pollen morphological characteristics support the traditional placement of these three genera into three different subfamilies in the Acanthaceae.