摘要
北美绿苹果组6个种的花粉属中等大小,多为圆球形,个别为长球形,3沟极轴走向,沟中央较宽,沿极轴方向渐细。萌发孔3个,环列于3沟之中央,孔沟属N_3P_4C_5型。外壁呈条网纹饰或近于条纹饰。6个种的花粉P/E值大小不同,依次为花冠海棠(1.3657)、窄叶海棠(1.0128)、草原海棠(0.9877)、扁果海棠(0.9822)、披针叶海棠(0.9769)和粉绿叶海棠(0.9674)。其P/E值可作为本组植物间演化关系的参考。
The pollen size of species of Sect Chloromeles (Decne)Rehd. in North America is of middle size mostly spherical, some few prolate. Parallel to polar axis are three colpi, wide in the middle but narrow at both ends. Three apertures zoniporate in the center of the colpi. So the colp-orate belongs to the type N3P4C5. Exine sculture striate-reticulate or similar-striate. No specific value among the six species in characteristics of their pollen morphology, but there is specific value of P/E clearly among them. The ratio of P/E value of M. coronaria Mill is very high,but that of M. glaucescens Rehd. is very low,and those of the other 4 species are limited in these 2 species. The P/E value may be regarded as a conference of Sect. Chloromeles in their evolution trend. The order of P/E value from high to low in Sect. Chloromeles Rehd. is from M. chloronaria Mill(1. 3657)-M. angustifolia Michex (1. 01277)-M. ioensis Britt (0. 9877)-M. platycarpa Redh. (0. 9822)-M. lancifolia Rehd. (0. 9769)-M. glaucescens Rehd. (0. 9674).
出处
《西南农业大学学报（自然科学版）》
CSCD
1995年第1期18-23,共6页
Journal of Southwest Agricultural University
基金
国家自然科学基金
关键词
苹果属
花粉
形态学
系统学
Malus
Pollen
electron- microscopic analysis
Morphology
/ chloromeles,systematics
