J Integr Plant Biol. ›› 1982, Vol. 24 ›› Issue (2): -.

• Research Articles •    

Cytological and Embryological Studies on Haploid Plant Production from Cultured Unpollinated Ovaries of Nicotiana tabacum L.

Wu Bo-ji and Cheng Kuo-chang   

Abstract: We obtained mature haploid (n = 24) ovary plants from in vitro cultured unpollinated young ovaries. These ovaries were induced to form embryoids which then developed into plants. The results obtained are summarized as follows: 1. The origin of development of the ovary haploid plants has been followed by light microscopy. Embryological abservations revealed that there are two ways of plantlet production: (1) Ovary haploid plant was derived from the macrospore without an intervening callus phase. (2) Ovary haploid plant was derived directly from the egg cell of mature embryo sac. In addition, Callus derived haploid plant was also obtained from the base and the tip of a bud of the above mentioned haploid plantlet. In same medium embryoids was derived from callus. Finally, plantlet was developed. 2. The exogenous hormones are necessary for high induction frequency of embryoid from unpollinated isolated young ovary, but these are not definitely necessary for induction of embryonic callus to form embryoids which then developed into plant. 3. The induction frequency of embryoid from in vitro cultured ovary and embryonic callus significantly increased when the concentration of thiamine, pyridoxine, ascorbic acid, nicotinic acid, inositol and folic acid was raised.

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