Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 539693
Title Characterization of the superoxide dismutase gene family in seeds of two Ricinus communis L. genotypes submitted to germination under water restriction conditions
Author(s) Gomes Neto, V.; Ribeiro, P.R.; Del-Bem, L.E.; Bernal, D.T.; Cunha Lima, S.T.; Ligterink, W.; Fernandez, L.G.; Castro, R.D. de
Source Environmental and Experimental Botany 155 (2018). - ISSN 0098-8472 - p. 453 - 463.
DOI https://doi.org/10.1016/j.envexpbot.2018.08.001
Department(s) Laboratory of Plant Physiology
EPS
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Castor bean - Germinability - Oilseeds - Oxidative stresses - Pre-germination treatments - Seed priming - Water restriction
Abstract

Abiotic stresses are the most important environmental factors that negatively affects crop production worldwide, whereas germination is the most critical phase in the plants life cycle. Water availability is essential for proper seed imbibition and vigorous germination and often scarce for Ricinus communis (castor bean) cultivated in semiarid regions of Brazil. Water restriction generally leads to the generation of reactive oxygen species (ROS) and one of the major families of enzymes that counteract ROS are superoxide dismutases (SODs). The objective of this study was to identify and characterize the SOD gene family of R. communis by phylogenetic, biochemical and gene expression analysis and link it to the effect of osmoconditioning on seed vigor. We characterized the effect of osmotic conditioning treatments of seeds of two contrasting R. communis cultivars, EBDA MPA34 and PARAGUAÇU, on germination performance. We also searched the R. communis genome for SOD genes and analyzed them phylogenetically and evaluated their activity and expression in embryos of seeds imbibed under different PEG concentrations (water restriction stress). We could show that some of these treatments improved germinability and vigor of seeds and seedlings in a cultivar-dependent manner. Additionally, R. communis seeds turned out to be very sensitive to the inhibition of germination by osmotic stress even at relative low concentrations. Eight SOD genes were found in the R. communis genome and classified based on phylogenetic analysis, protein domains and prediction of subcellular localization. SOD gene expression was mostly induced during seed imbibition, although their expression was generally inhibited in osmotic potentials below −0.6 MPa and showed partly different gene expression profiles between contrasting cultivars. Cv. PARAGUAÇU showed increased seed vigor after osmoconditioning as compared to cv. EBDA MPA34 which could be related to higher responses of some cv. PARAGUAÇU SOD genes to stress. Our results indicate that SOD genes might be of special interest for R. communis genetic engineering aimed at the increase of production in semiarid regions.

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