Plant Diversity ›› 2001, Vol. 23 ›› Issue (01): 1-3.

• Articles •    

Ultrastructure of the Egg Apparatus and the Synergids after Fertilization in Allium fistulosum

XI Xiang-Yuan LUAN Feng-Zhu   

  1. College of Life Sciences, Agricultural University of Shandong
  • Online:2001-02-25 Published:2001-02-25

Abstract: The egg apparatus in Allium fistulosum cv. Zhangqiu consists of an egg and two synergids. A few apparatus observed lacked egg cells but, two had synergids. The gee cell had a nucleus with much of the cytoplasm at the chalazal ends and a large vacuole occupying the other area of the cell. The egg cell contained many ribosomes, polysomes, mitochondria with distinct cristae, RER. Dictyosomes had vesicles. The egg cell appeared to be an active cell. The cell wall surrounds the cell, but its chalzal ends and the lateral wall with synergid is discontinuous. The synergid possesses a larger nucleus located in the expanded portion of the cell and many small vacuoles throughout the cytoplasm. Ribosomes, polysomes, mitochondria, RER and concentric ring-shaped RER are abundant and dictyosomes with vesicles are frequently seen, reflecting its active metabolism.

Key words: Allium fistulosum