Generation of Superoxide by OeRbohH, a NADPH Oxidase Activity During Olive (Olea europaea L.) Pollen Development and Germination

0509261 - ÚEB 2020 RIV CH eng J - Journal Article
Jiménez-Quesada, M. J. - Traverso, J. A. - Potocký, Martin - Žárský, Viktor - Alché, J.
Generation of Superoxide by OeRbohH, a NADPH Oxidase Activity During Olive (Olea europaea L.) Pollen Development and Germination.
Frontiers in Plant Science. Roč. 10, SEP 19 (2019), č. článku 1149. ISSN 1664-462X. E-ISSN 1664-462X
R&D Projects: GA MŠMT(CZ) EF16_019/0000738; GA ČR(CZ) GC18-18290J
Institutional support: RVO:61389030
Keywords : oxygen species production * horseradish-peroxidase * oxidative stress * actin-filaments * nitro-proteomes * gene-expression * tube growth * arabidopsis * protein * burst * NADPH oxidase * nox * pollen * Rboh * sexual plant reproduction * olive
OECD category: Biochemical research methods
Impact factor: 4.402, year: 2019
Method of publishing: Open access
http://dx.doi.org/10.3389/fpls.2019.01149

Reactive oxygen species (ROS) are produced in the olive reproductive organs as the result of intense metabolism. ROS production and pattern of distribution depend on the developmental stage, supposedly playing a broad panel of functions, which include defense and signaling between pollen and pistil. Among ROS-producing mechanisms, plasma membrane NADPH-oxidase activity is being highlighted in plant tissues, and two enzymes of this type have been characterized in Arabidopsis thaliana pollen (RbohH and RbohJ), playing important roles in pollen physiology. Besides, pollen from different species has shown distinct ROS production mechanism and patterns of distribution. In the olive reproductive tissues, a significant production of superoxide has been described. However, the enzymes responsible for such generation are unknown. Here, we have identified an Rboh-type gene (OeRbohH), mainly expressed in olive pollen. OeRbohH possesses a high degree of identity with RbohH and RbohJ from Arabidopsis, sharing most structural features and motifs. Immunohistochemistry experiments allowed us to localize OeRbohH throughout pollen ontogeny as well as during pollen tube elongation. Furthermore, the balanced activity of tip-localized OeRbohH during pollen tube growth has been shown to be important for normal pollen physiology. This was evidenced by the fact that overexpression caused abnormal phenotypes, whereas incubation with specific NADPH oxidase inhibitor or gene knockdown lead to impaired ROS production and subsequent inhibition of pollen germination and pollen tube growth.
Permanent Link: http://hdl.handle.net/11104/0300006