Plant Diversity ›› 1996, Vol. 18 ›› Issue (02): 1-3.

• Articles •    


Liu Jian-quan,He Ting-nong   

  1. Northwest Plateau Institute of Biology,Academia Sinica,Xining 810001
  • Online:1996-04-25 Published:1996-04-25

Abstract: The endosperm nuclei divide sumul-taneously and each nucleus contains 2~3 nucleoli. The embryogeny corresponds to the Soland type Physalis I variation type. The antipodal cells form a layer like "out endosperm" just out of the endosperm nuclei layer and the degeneration starts from the division of the zygote. Gentianella differs form Gentiana in following embryological characters: single-origined and secretary tapetum without placentoids and trabeculae; the persistent epidermis but reduced endothecium; typical secretary type of the tapetum; 3-celled pollen when shed; 4-seriate ovules on reduced parietal placentae, hemianatropous ovules; distinct epistase; 8-l2 per- sistent multiple multinucleate highly emlarged and haustorial antipodal cells; the pollen tube not breaking any synergid and two synergids persisting during fertilization; having the embryogeny of the Soland type Physalis I variation type; each endosperm nucleus with 2-3 nucleoli; the antipodal cells forming a layer like "out endosperm" just out of the endosperm nucleus layer and degener ating after the division of the zygote. Embryological research indicates that Gentianella has a dis-tant relationship to Gentiana and it should be treated as a separated genus. Two genera may be at different evolutionary lines.

Key words: Gentianella azurea