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- W2084278247 abstract "Acclimation of winter oilseed plants in the cold (i.e. at temperatures >0 °C) followed by short exposure to sub‐lethal freezing temperatures resulted in pronounced ultrastructural changes of leaf epidermal and mesophyll cells. The following major changes were observed upon acclimation at 2 °C: increased thickness of cell walls; numerous invaginations of plasma membranes; the appearance of many large vesicles localized in the cytoplasm in close proximity to the central vacuole; the occurrence of abundant populations of microvesicles associated with the endoplasmic reticulum (ER) cisternae or located in the vicinity of dictyosomes; and the occurrence of paramural bodies and myelin‐like structures. In addition, large phenolic deposits were observed in the vicinity of the plasma membrane and membrane‐bound organelles such as chloroplasts, large vesicles or cytoplasm/tonoplast interfaces. Transient freezing (–5 °C for 18 h) of the cold‐acclimated leaves led to reversible disorganization of the cytoplasm and to pronounced structural changes of the cellular organelles. Chloroplasts were swollen, with the stroma occupying one half of their volume and the thylakoid system being displaced to the other half. Large phenolic aggregates disappeared but distinct layers of phenolic deposits were associated with mitochondrial membranes and with chloroplast envelopes. In frost‐thawed cells recovered at 2 °C for 24 h, dictyosomes and dictyosome‐ or ER‐derived small vesicles reappeared in the ribosome‐rich cytoplasm. Aberrations in the structure of chloroplasts and mitochondria were less pronounced. Few phenolic deposits were seen as small grains associated with chloroplast envelopes and vesicle membranes. These observations demonstrate that plants undergo different changes in cell ultrastructure depending on whether they are subjected to chilling or freezing temperatures. Results are discussed in relation to membrane recycling and the possible role of phenolics during the first and second stages of plant acclimation at low temperature." @default.
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- W2084278247 title "Low Temperature-induced Modifications in Cell Ultrastructure and Localization of Phenolics in Winter Oilseed Rape (Brassica napus L. var. oleifera L.) Leaves" @default.
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- W2084278247 doi "https://doi.org/10.1093/aob/mcf241" @default.
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