Two Oleosins Expressed in the Mesocarp of Native Mexican Avocado, Key Genes in the Oil Content

Intracellular lipid droplets (LD) provide the oil storage mechanism of plants. They are found within seeds as individual structures, even under conditions of cold stress and dehydration, due to the protein that covers them. This protein, called oleosin, is found exclusively in plants and has been wi...

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Bibliographic Details
Published in:Plant foods for human nutrition (Dordrecht) 2021-03, Vol.76 (1), p.20-25
Main Authors: Sánchez-Albarrán, Fernando, Suárez-Rodríguez, Luis María, Ruíz-Herrera, León Francisco, López-Meza, Joel Edmundo, López-Gómez, Rodolfo
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Dehydration
Ecology
Food Science
Fruit - genetics
Fruits
Gene expression
Genes
Lipids
Nutrition
Oleosin
Original Paper
Persea - genetics
Plant Physiology
Plants
Proteins
Ripening
Seeds
Seeds - genetics
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Summary:Intracellular lipid droplets (LD) provide the oil storage mechanism of plants. They are found within seeds as individual structures, even under conditions of cold stress and dehydration, due to the protein that covers them. This protein, called oleosin, is found exclusively in plants and has been widely studied in seeds. Avocado fruits ( Persea americana Mill.) are rich in oil, which is stored in the mesocarp, not in the seeds. The presence of oleosin in the mesocarp tissue of avocadoes has been reported, but its physiological role is still unknown. In this study, we identify two genes that code for oleosin in the mesocarp of the native Mexican avocado. These sequences are very different from those of seed oleosins. Both genes are expressed during fruit ripening, while one, PaOle1 , has the highest expression in the green fruit stage. The protein of PaOle1 is stable during the fruit ripening process and covers all the mesocarp LDs. The expression of PaOle1 gene and protein is organ specific to avocado mesocarp. Among avocadoes varieties oleosin abundance is directly related to oil content.
ISSN:0921-9668
1573-9104
DOI:10.1007/s11130-020-00868-2