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Bulletin of Botanical Research ›› 2009, Vol. 29 ›› Issue (1): 25-32.doi: 10.7525/j.issn.1673-5102.2009.01.007

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Leaf Epidermal Feature of Astragalus L. Subgenus Pogonophace Bunge(Leguminosae) from China and Its Systematic Significance

KANG Yun;ZHANG Ming-Li;*   

  1. 1.School of Pharmacy,Fudan University,Shanghai 200032 2.Institute of Botany,Chinese Academy of Sciences,Beijing 100093 3.Laboratory of Evolution and Biodiversity Conservation in Arid Region,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-01-20 Published:2009-01-20
  • Contact: ZHANG Ming-Li
  • Supported by:

Abstract: The leaf epidermis of 16 species and 1 variety of Astragalus subgenus Pogonophace was investigated by the light microscopy (LM) and partially by the scanning electron microscopy (SEM). The result shows that the stomatal apparatus of these species are present in both abaxial and adaxial epidermis. It is shown that the leaf epidermal cells are polygonal or irregular in shape. The patterns of anticlinal walls are straight, sinuous or sinuate. Based on the shape and the anticlinal wall patterns of the epidermis cells, there are four types of epidermis can be recognized. The four epidermis types are consistent with the sections of Pogonophace to some extent but not all. Under SEM observation, because of the cuticular layer of the leaf epidermis, the stomatal appatatus is at a lower place. The outer stomatal rim and its inner margin of these species are almost the same. In a few species, the cuticular layer of the leaf epidermis has a special appearance. Therefore, this character can be used as a criterion to identify these species in Pogonophace.

Key words: Leguminosae, Astragalus, Pogonophace, leaf epidermis, systematic significance

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