Date: 21 Mar 2013

Gynogenesis

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Abstract

Normally, the egg cell requires the fertilization stimulus to form an embryo. However, it has the necessary genetic information to initiate embryogenesis independent of fertilization (Parthenogenesis). In some apomictic plants, the egg cell divides in total absence of a stimulus from the male gametes. In several other plants, it is possible to induce the egg or some other cell of the embryo sac (Apogamy) by external treatments, to divide and form an embryo (Bhojwani and Thomas 2001). Development of sporophytes from an unfertilized element of the female gametophyte (embryo sac) is termed gynogenesis. Since the ells of the embryo sac are haploid the plants derived from them are also haploid.