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Histology of Callogenesis and Somatic Embryogenesis Induced in Stem Fragments of Cork Oak (Quercus suber) Cultured In Vitro

Identifieur interne : 000888 ( Istex/Corpus ); précédent : 000887; suivant : 000889

Histology of Callogenesis and Somatic Embryogenesis Induced in Stem Fragments of Cork Oak (Quercus suber) Cultured In Vitro

Auteurs : M. El Maâtaoui ; H. Espagnac ; N. Michaux-Ferrière

Source :

RBID : ISTEX:574E8AF42CC24B8AAD7CDE01079E9AB4FAAF7C0D

Abstract

Calluses able to produce somatic embryos were formed during in vitro culture of shoot fragments of cork oak (Quercus suber L.).Histological monitoring of these fragments during culture showed that it was the cortical parenchyma cells which underwent dedifferentiation before calluses were formed by repeated divisions. The calluses consisted of parenchyma cells surrounded by a few layers of meristematic cells. Proembryos formed in groups around the edge of some calluses. Histological examination showed that they were produced by the evolution of two different categories of cell: one category had the appearance of ‘embryogenic’ cells with very thick walls, a small vacuole rich in starch and a well-developed nucleus with a prominent nucleolus. The other cells were very bulky with large vacuoles; their morphology was similar to that of suspensor cells encountered in embryogenesis in gymnosperms. The ontogenic stages were similar to those described in zygotic embryos of the genus Quercus. Nevertheless, most of the embryonic structures deviated from normal development and at all stages produced secondary proembryos.

Url:
DOI: 10.1093/oxfordjournals.aob.a088014

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ISTEX:574E8AF42CC24B8AAD7CDE01079E9AB4FAAF7C0D

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<abstract>Calluses able to produce somatic embryos were formed during in vitro culture of shoot fragments of cork oak (Quercus suber L.).Histological monitoring of these fragments during culture showed that it was the cortical parenchyma cells which underwent dedifferentiation before calluses were formed by repeated divisions. The calluses consisted of parenchyma cells surrounded by a few layers of meristematic cells. Proembryos formed in groups around the edge of some calluses. Histological examination showed that they were produced by the evolution of two different categories of cell: one category had the appearance of ‘embryogenic’ cells with very thick walls, a small vacuole rich in starch and a well-developed nucleus with a prominent nucleolus. The other cells were very bulky with large vacuoles; their morphology was similar to that of suspensor cells encountered in embryogenesis in gymnosperms. The ontogenic stages were similar to those described in zygotic embryos of the genus Quercus. Nevertheless, most of the embryonic structures deviated from normal development and at all stages produced secondary proembryos.</abstract>
<note type="author-notes">* For correspondence.</note>
<subject>
<genre>keywords</genre>
<topic>Cork-oak</topic>
<topic>Quercus suber L</topic>
<topic>histology</topic>
<topic>callogenesis</topic>
<topic>somatic embryogenesis</topic>
<topic>embryogenic cells</topic>
<topic>starch</topic>
<topic>secondary embryogenesis</topic>
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<identifier type="ISSN">0305-7364</identifier>
<identifier type="eISSN">1095-8290</identifier>
<identifier type="PublisherID">annbot</identifier>
<identifier type="PublisherID-hwp">annbot</identifier>
<part>
<date>1990</date>
<detail type="volume">
<caption>vol.</caption>
<number>66</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>2</number>
</detail>
<extent unit="pages">
<start>183</start>
<end>190</end>
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<identifier type="istex">574E8AF42CC24B8AAD7CDE01079E9AB4FAAF7C0D</identifier>
<identifier type="DOI">10.1093/oxfordjournals.aob.a088014</identifier>
<identifier type="ArticleID">66.2.183</identifier>
<accessCondition type="use and reproduction" contentType="copyright">© 1990 Annals of Botany Company</accessCondition>
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