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Embryogenesis

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Introduction

Yang Yen
College of Agriculture and Biological Sciences at South Dakota State University, USA

Patricia Hain
Department of Agronomy and Horticulture at University of Nebraska-Lincoln, USA


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Zygotic Embryo

Somatic Embryonic Cell

Embryogenesis is the process of initiation and development of an embryo from a zygote (zygotic embryogenesis) or a somatic cell (somatic embryogenesis). 

Embryo development occurs through an exceptionally organized sequence of cell division, enlargement and differentiation. Zygotic and somatic embryos share the same gross pattern of development. Both types of embryos develop as passing through typical developmental stages, such as globular, scutellar and coleoptilar stages for monocots, or globular, heart, torpedo and cotyledonary stages for dicots and conifers. Embryo development is bipolar, having a shoot and a radicular pole at opposite ends.
 

 

 

Zygotic Embryo Chart

 

Somatic Embryo Chart

 


Development of this lesson was supported in part by Cooperative State Research, Education, & Extension Service, U.S. Dept of Agriculture under Agreement Number 98-EATP-1-0403 administered by Cornell University and the American Distance Education Consortium (ADEC).  Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

 

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