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›› 1980, Vol. 16 ›› Issue (1): 1-6.

• 论文及研究报告 •     Next Articles

SOME EMBRYOLOGICAL OBSERVATION ON TUNG TREE (ALEURITES FORDII HEMSL.)

Cao Ju-yi,Cheng Jin-chen   

  1. Biology Department, Teachers College of Central China
  • Received:1900-01-01 Revised:1900-01-01 Online:1980-02-25 Published:1980-02-25

Abstract: From slides of longitudinal sections of ovules, it is shown that the ovule is "Hemiantropous" rather than true "anatropus" as described by Mccann (1945). The embryo sac is of "Polygonum type". with the antipdal cells penetrating deeply into the nucellar tissue on the chalazal end to act as absorbing haustorium. After the tree was artificially pollinated, germination of pollen on the stigamatic surface, and passage of pollen tube growth through the stylar tissue: Obturator and nucellar beak into the embryo sac were carefully watched and followed. On slides of the same ovule sectioned after 2 days of pollination, secondary nucleus, sperm nucleus and fertilized egg were found. In 2 ovules sectioned after 11-12 days of pollination, the first cell divisiion of their young embryos was diagonal, and not transverse as noted by Mccann. In the spherical embryo stage, plumular primordia were distinct.