Functional analysis of Arabidopsis and maize transgenic lines overexpressing the ADP-ribose/NADH pyrophosphohydrolase, AtNUDX7

• Published in: The International journal of developmental biology Vol. 63; no. 1-2; pp. 45 - 55
• Main Authors: Njuguna, Elizabeth, Coussens, Griet, Neyt, Pia, Aesaert, Stijn, Storme, Veronique, Demuynck, Kirin, Vanhaeren, Hannes, Dhondt, Stijn, Van Haver, Yolaine, Paul, Linus, Inzé, Dirk, Nelissen, Hilde, Van Lijsebettens, Mieke
• Format: Journal Article
• Language: English
• Published: Spain University of the Basque Country Press 2019
• Subjects: Adenosine diphosphate; Adenosine Diphosphate Ribose - metabolism; ADP-ribosylation; Arabidopsis; Arabidopsis - enzymology; Arabidopsis - genetics; Arabidopsis - growth & development; Arabidopsis Proteins - genetics; Arabidopsis Proteins - metabolism; Automation; Corn; Crop yield; Drought; Droughts; Energy balance; Energy levels; Flowering; Food supply; Functional analysis; Gene Expression Regulation, Plant; Homeostasis; NAD - metabolism; NADH; Nicotinamide adenine dinucleotide; Oxidative Stress; Parameters; Plants, Genetically Modified - enzymology; Plants, Genetically Modified - genetics; Plants, Genetically Modified - growth & development; Promoter Regions, Genetic; Pyrophosphatases - genetics; Pyrophosphatases - metabolism; Pyrophosphohydrolase; Ribose; Seeds - enzymology; Seeds - genetics; Seeds - growth & development; Stress; Stress, Physiological; Viruses; Zea mays; Zea mays - enzymology; Zea mays - genetics; Zea mays - growth & development
• ISSN: 0214-6282; 1696-3547
• DOI: 10.1387/ijdb.180360mv

The conserved poly(ADP-ribosyl)ation (PAR) pathway consists of three genetic components that are potential targets to modulate the plant's energy homeostasis upon stress with the aim to improve yield stability in crops and help secure food supply. We studied the role of the PAR pathway component ADP-ribose/NADH pyrophosphohydrolase (AtNUDX7) in yield and mild drought stress by using a transgenic approach in Arabidopsis thaliana and maize (Zea mays). Arabidopsis AtNUDX7 cDNA was overexpressed in Arabidopsis and maize by means of the constitutive Cauliflower Mosaic Virus 35S promoter and the strong constitutive Brachypodium distachyon pBdEF1α promoter, respectively. Overexpression of AtNUDX7 in Arabidopsis improved seed parameters that were measured by a novel, automated method, accelerated flowering and reduced inflorescence height. This combination of beneficial traits suggested that AtNUDX7 overexpression in Arabidopsis might enhance the ADP-ribose recycling step and maintain energy levels by supplying an ATP source in the poly(ADP-ribosyl)ation energy homeostasis pathway. Arabidopsis and maize lines with high, medium and low overexpression levels of the AtNUDX7 gene were analysed in automated platforms and the inhibition of several growth parameters was determined under mild drought stress conditions. The data showed that the constitutive overexpression of the Arabidopsis AtNUDX7 gene in Arabidopsis and maize at varying levels did not improve tolerance to mild drought stress, but knocking down AtNUDX7 expression did, however at the expense of general growth under normal conditions.