Plant Diversity ›› 1997, Vol. 19 ›› Issue (03): 1-3.

• Articles •    


Deng Yanbin, Wang Hong, Jiang Yancheng   

  1. Department of Biology, Xingjang University, Urumqi 830046
  • Online:1997-06-25 Published:1997-06-25

Abstract: Anatomic studies and cytological observation of the floral nectary in Cardaria draba (L.) Desv. are conducted with light and scanning electron microscopy. The Cardaria draba flower has six floral nectaries which include four lateral and two median nectaries. Their floral nectaries belong to the spearate lateral and between median subtypes of the lateral nectary types. The struc-ture of lateral and median nectaries is exhibiting similar structural features. They are composed of epidermis and nectariferous tissure. The modified stomata is present in the epidermal layer, and there is no vascular bundle in the nectariferous tissue, belonging to the primitive subtypes of floral nectaries in Cruciferae. After various floral organs develop, the superfical layer cells of the recep-tacle between stamens become matic activity and form the primordium nectaries, which undergo the division and differentiation as well as formation of morphology. As a result, the nectaries has developed to mature ones. The initaition and development of lateral and median nectaries form synchronism. During the development of nectary, both the vacules and the starch grains change regularly. After pre-nectar has been processed and composed in the nectariferous tissue, it is ex-creted from the modified stoma.

Key words: Cardaria draba