NADPH Oxidase-Dependent Superoxide Production in Plant Reproductive Tissues
Metadatos
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Frontiers Media
Materia
NADPH oxidase NOX pollen
Fecha
2016-03-31Referencia bibliográfica
Jiménez Quesada, M.J. & Traverso Gutiérrez, J.A. & Alché, J. Front. Plant Sci. 7:359. [https://doi.org/10.3389/fpls.2016.00359]
Patrocinador
European Regional Development Fund (ERDF) co-financed grants: BFU2008-006292, BFU2011-22779, CSIC-201540E065, and RECUPERA2020-3.1.4Resumen
In the life cycle of a flowering plant, the male gametophyte (pollen grain) produced
in the anther reaches the stigmatic surface and initiates the pollen–pistil interaction,
an important step in plant reproduction, which ultimately leads to the delivery of two
sperm cells to the female gametophyte (embryo sac) inside the ovule. The pollen
tube undergoes a strictly apical expansion characterized by a high growth rate, whose
targeting should be tightly regulated. A continuous exchange of signals therefore takes
place between the haploid pollen and diploid tissue of the pistil until fertilization. In
compatible interactions, theses processes result in double fertilization to form a zygote
(2n) and the triploid endosperm. Among the large number of signaling mechanisms
involved, the redox network appears to be particularly important. Respiratory burst
oxidase homologs (Rbohs) are superoxide-producing enzymes involved in a broad
range of processes in plant physiology. In this study, we review the latest findings
on understanding Rboh activity in sexual plant reproduction, with a particular focus
on the male gametophyte from the anther development stages to the crowning point
of fertilization. Rboh isoforms have been identified in both the male and female
gametophyte and have proven to be tightly regulated. Their role at crucial points such
as proper growth of pollen tube, self-incompatibility response and eventual fertilization
is discussed.