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Somatic Embryogenesis in Herbaceous Monocots

  • Chapter
In Vitro Embryogenesis in Plants

Part of the book series: Current Plant Science and Biotechnology in Agriculture ((PSBA,volume 20))

Abstract

The seed is the primary organ for the perpetuation of germplasm and propagation in all flowering plants. It contains the embryo which develops from the zygote following the fertilization of the egg cell by one of the male gametes. Gene recombination during the formation, as well as the fusion, of the gametes plays a critical role in the evolution of the angiosperms. During its development the embryo is nourished by the endosperm, which itself is formed as a result of the fusion of the second male gamete with two nuclei (in most of the angiosperms) of the central cell of the embryo sac. During the course of evolution many species have developed special means of propagation to overcome physical, environmental and genetic factors that prevent flowering and seed formation. These include the formation of perennial structures such as tubers, rhizomes, bulbs, stolons, etc (see Sharma and Thorpe, this volume). An advanced form of perennation is found in many apomictic species which produce embryos from unfertilized gametic or somatic cells. Like the zygotic embryos, the apomictic embryos develop within the seed and are protected and dispersed like natural seed. Apomictic embryos of all genotypes — irrespective of heterozygosity — developing from unreduced and unfertilized somatic or gametic cells (agamospermy, adventive embryony, apospory, diplospory) breed true and give rise to clonal populations. Apomixis is known to be under genetic control, but environmental conditions such as temperature and photoperiod may also promote a switch from sexual to apomictic development [1,2].

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Authors
  1. Sankaran Krishnaraj
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  2. Indra K. Vasil
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  1. Plant Physiology Research Group, Department of Biological Sciences, The University of Calgary, Calgary, Alberta, Canada

    Trevor A. Thorpe

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Krishnaraj, S., Vasil, I.K. (1995). Somatic Embryogenesis in Herbaceous Monocots. In: Thorpe, T.A. (eds) In Vitro Embryogenesis in Plants. Current Plant Science and Biotechnology in Agriculture, vol 20. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0485-2_11

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