NDLI: Are there symplastic connections between the endosperm and embryo in some angiosperms?

Content Provider	Springer Nature Link
Author	Kozieradzka Kiszkur, Małgorzata Płach, Bartosz Jan
Copyright Year	2011
Abstract	It is believed that there is symplastic isolation between the embryo (new sporophyte) and the endosperm (maternal-parental origin tissue, which nourishes the embryo) in angiosperms. However, in embryological literature there are rare examples in which plasmodesmata between the embryo suspensor and endosperm cells have been recorded (three species from Fabaceae). This study was undertaken in order to test the hypothesis that plasmodesmata between the embryo suspensor and the endosperm are not so rare but also occur in other angiosperm families; in order to check this, we used the Crassulaceae family because embryogenesis in Crassulaceae has been studied extensively at an ultrastructure level recently and also we tread members of this family as model for suspensor physiology and function studies. These plasmodesmata even occurred between the basal cell of the two-celled proembryo and endosperm cells. The plasmodesmata were simple at this stage of development. During the development of the embryo proper and the suspensor, the structure of plasmodesmata changes. They were branched and connected with electron-dense material. Our results suggest that in Crassulaceae with plasmodesmata between the endosperm and suspensor, symplastic connectivity at this cell–cell boundary is still reduced or blocked at a very early stage of embryo development (before the globular stage). The occurrence of plasmodesmata between the embryo suspensor and endosperm cells suggests possible symplastic transport between these different organs, at least at a very early stage of embryo development. However, whether this transport actually occurs needs to be proven experimentally. A broader analysis of plants from various families would show whether the occurrence of plasmodesmata between the embryo suspensor and the endosperm are typical embryological characteristics and if this is useful in discussions about angiosperm systematic and evolution.
Starting Page	1081
Ending Page	1089
Page Count	9
File Format	PDF
ISSN	0033183X
Journal	Protoplasma
Volume Number	249
Issue Number	4
e-ISSN	16156102
Language	English
Publisher	Springer Vienna
Publisher Date	2011-11-27
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Crassulaceae Embryo suspensor Endosperm Plasmodesmata Symplastic transport Ultrastructure Plant Sciences Zoology Cell Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine

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