Formation and excretion of autophagic plastids (plastolysomes) in Brassica napus embryogenic microspores

Frontiers in Plant Science
Verónica Parra-VegaJ M Seguí-Simarro

Abstract

The change in developmental fate of microspores reprogrammed toward embryogenesis is a complex but fascinating experimental system where microspores undergo dramatic changes derived from the developmental switch. After 40 years of study of the ultrastructural changes undergone by the induced microspores, many questions are still open. In this work, we analyzed the architecture of DNA-containing organelles such as plastids and mitochondria in samples of B. napus isolated microspore cultures covering the different stages before, during, and after the developmental switch. Mitochondria presented a conventional oval or sausage-like morphology for all cell types studied, similar to that found in vivo in other cell types from vegetative parts. Similarly, plastids of microspores before induction and of non-induced cells showed conventional architectures. However, approximately 40% of the plastids of embryogenic microspores presented atypical features such as curved profiles, protrusions, and internal compartments filled with cytoplasm. Three-dimensional reconstructions confirmed that these plastids actually engulf cytoplasm regions, isolating them from the rest of the cell. Acid phosphatase activity was found in them, confirming the l...Continue Reading

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Citations

Jun 3, 2017·The New Phytologist·Elena A MininaPeter V Bozhkov
Jan 10, 2018·Cells·Jessica MarionBéatrice Satiat-Jeunemaitre

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Methods Mentioned

BETA
transmission electron microscopy
light microscopy

Software Mentioned

MIDAS
IMOD

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