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Título: | New insights into the early steps of oil body mobilization during pollen germination |
Autor: | Zienkiewicz, Agnieszka CSIC ORCID; Zienkiewicz, Krzysztof CSIC ORCID; Rejón, Juan David CSIC; Rodríguez García, María I. CSIC ORCID ; Castro López, Antonio Jesús CSIC ORCID | Fecha de publicación: | 2013 | Editor: | Oxford University Press | Citación: | Journal of Experimental Botany 64(1): 293-302 (2013) | Resumen: | In some plants, pollen grains accumulate storage lipids that serve as energy supply during germination. Here, three enzymes involved in early steps of oil body mobilization in the male gametophyte were functionally characterized for the first time. The effect of extracellular sugars on pollen performance and oil body dynamics was also analysed. Olive pollen oil bodies showed phospholipase A, lipase, and lipoxygenase activities on their surface. Enzyme activity levels increased during germination with a maximum after 3h. Removal of extracellular sugars from the germination medium did not affect pollen performance but increased enzyme activity rates and sped up oil body mobilization. Inhibitors seriously hampered pollen germination and pollen tube growth, leading to a characteristic accumulation of oil bodies in the germinative aperture. It can be concluded that storage lipids are sufficient for proper olive pollen germination. A lipase and a lipoxygenase are likely involved in oil body mobilization. Extracellular sugars may modulate their function, while a phospholipase A may promote their access to the storage lipids. | Versión del editor: | https://doi.org/10.1093/jxb/ers332 | URI: | http://hdl.handle.net/10261/276492 | DOI: | 10.1093/jxb/ers332 | ISSN: | 0022-0957 |
Aparece en las colecciones: | (EEZ) Artículos |
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newgerminat.pdf | 3,37 MB | Adobe PDF | Visualizar/Abrir |
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