Data/hora: 08/06/2024 03:27:19

Provedor de dados: 	Acta Scientiarum: Agronomy	
País: 	Brazil	
Título: 	Effects of high proline accumulation on chloroplast and mitochondrial ultrastructure and on osmotic adjustment in tobacco plants	
Autores: 	Borgo, Lucélia; Marur, Celso Jamil; Vieira, Luiz Gonzaga Esteves.	
Data: 	2015-05-04	
Ano: 	2015	
Palavras-chave: 	5.01.00.00-9 p5cs; Transgenic; Water deficit Melhoramento Vegetal.	
Resumo: 	Proline accumulates in many organisms in response to abiotic stresses, such as drought and salinity. Reports have discussed the role of proline in relation to osmotic adjustment, even though no clear-cut evidence has yet been provided demonstrating this association as a defense mechanism against drought stress in plants. However, it has been indicated that the application of exogenous proline can damage the ultrastructure of chloroplasts and mitochondria. In this study, using transgenic tobacco plants carrying a mutant p5cs gene from Vigna aconitifolia under control of the CaMV 35S promoter, we show that the high levels of endogenous proline accumulated in leaves does not contribute to the osmotic adjustment in plants under water deficit conditions. Additionally, electron microscopic observations of mitochondria and chloroplasts show that the ultrastructure of these organelles was not damaged even in the transgenic plants, with the leaves presenting the highest endogenous proline content in (100 µmol g-1 dry mass). This investigation demonstrates that in tobacco, high levels of endogenous free proline are not associated with osmotic adjustment and that elevated proline content in leaves, even at levels 10 times higher than normal, do not disturb the chloroplast and mitochondria ultrastructure under both irrigated and water deficit conditions. 	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19097

10.4025/actasciagron.v37i2.19097	
Editor: 	Universidade Estadual de Maringá	
Relação: 	http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19097/pdf_68	
Formato: 	application/pdf	
Fonte: 	Acta Scientiarum. Agronomy; v. 37, n. 2 (2015); 191-199

Acta Scientiarum. Agronomy; v. 37, n. 2 (2015); 191-199

1807-8621

1679-9275