Development of Embryo Suspensors for Five Genera of Crassulaceae with Special Emphasis on Plasmodesmata Distribution and Ultrastructure
Autor: | Daria Majcher, Joanna Rojek, Małgorzata Kozieradzka-Kiszkurno, Emilia Brzezicka, Justyna Wróbel-Marek, Ewa Kurczyńska |
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Rok vydání: | 2020 |
Předmět: |
0106 biological sciences
0301 basic medicine embryo Plant Science Plasmodesma Biology 01 natural sciences Article Sedum endopolyploid cells symplasmic connection 03 medical and health sciences lcsh:Botany Haustorium Aichryson Ovule Monanthes Ecology Evolution Behavior and Systematics Ecology Aeonium Echeveria biology.organism_classification lcsh:QK1-989 Cell biology Crassulaceae 030104 developmental biology Cytoplasm Ultrastructure embryogenesis Suspensor ovule 010606 plant biology & botany |
Zdroj: | Plants Volume 9 Issue 3 Plants, Vol 9, Iss 3, p 320 (2020) |
ISSN: | 2223-7747 |
DOI: | 10.3390/plants9030320 |
Popis: | The suspensor in the majority of angiosperms is an evolutionally conserved embryonic structure functioning as a conduit that connects ovule tissues with the embryo proper for nutrients and growth factors flux. This is the first study serving the purpose of investigating the correlation between suspensor types and plasmodesmata (PD), by the ultrastructure of this organ in respect of its full development. The special attention is paid to PD in representatives of Crassulaceae genera: Sedum, Aeonium, Monanthes, Aichryson and Echeveria. The contribution of the suspensor in transporting nutrients to the embryo was confirmed by the basal cell structure of the suspensor which produced, on the micropylar side of all genera investigated, a branched haustorium protruding into the surrounding ovular tissue and with wall ingrowths typically associated with cell transfer. The cytoplasm of the basal cell was rich in endoplasmic reticulum, mitochondria, dictyosomes, specialized plastids, microtubules, microbodies and lipid droplets. The basal cell sustained a symplasmic connection with endosperm and neighboring suspensor cells. Our results indicated the dependence of PD ultrastructure on the type of suspensor development: (i) simple PD are assigned to an uniseriate filamentous suspensor and (ii) PD with an electron-dense material are formed in a multiseriate suspensor. The occurrence of only one or both types of PD seems to be specific for the species but not for the genus. Indeed, in the two tested species of Sedum (with the distinct uniseriate/multiseriate suspensors), a diversity in the structure of PD depends on the developmental pattern of the suspensor. In all other genera (with the multiseriate type of development of the suspensor), the one type of electron-dense PD was observed. |
Databáze: | OpenAIRE |
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