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Annals of Botany 78: 105-110, 1996
© 1996 Annals of Botany Company

Embryology of Cymbidium sinense: Embryo Development

EDWARD C. YEUNG+, S. Y. ZEE and X. L. YE

Department of Biological Sciences, University of Calgary, Calgary, Alberta, T2N 1N4, Canada Department of Botany, University of Hong Kong, Hong Kong The South China Institute of Botany, Guangzhou, 510650, China

August 14, 1995 ; January 30, 1996

Embryo development inCymbidium sinense is characterized by two consecutive oblique divisions resulting in the formation of a four-celled embryo. Three of the four cells towards the micropyle begin to vacuolate while the remaining cell located at the terminus remains cytoplasmic. The three cells towards the base become suspensor cells, and they continue to elongate and expand by the process of vacuolation. The terminal cytoplasmic cell continues to divide and give rise to the embryo proper and additional suspensor cells. Nile red staining indicates the absence of cuticular material in the walls of the suspensor cells. A positive reaction towards nile red can be detected in the embryo proper after periclinal divisions have ceased in the surface layer. In the mature embryo, storage protein and lipid are present in the cells of the embryo proper.

Embryo; orchid; suspensor; cuticle; Cymbidium sinense (Andr.) Willd.


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