Data/hora: 07/06/2024 10:25:39

Provedor de dados: 	61	
País: 	Brazil	
Título: 	Effects of n-propyl gallate on photosynthesis and physiological parameters in Dunaliella salina are affected by stressful conditions	
Autores: 	Einali,Alireza; Shariati,Mansour.	
Data: 	2012-09-01	
Ano: 	2012	
Palavras-chave: 	Chlorophyll fluorescence; Dunaliella salina; Light intensity; Photosynthesis; Salt stress.	
Resumo: 	We studied the effects of n-propyl gallate, which is a plastid terminal oxidase inhibitor involved in chlororespiration, on photosynthesis and physiological parameters in Dunaliella salina grown under different salinities and under low or high irradiance using chlorophyll a fluorescence transient measurements and pigment analysis. The inhibitor up to 1 mM had an additive significant effect on the photosynthetic efficiency in the cell suspensions grown under low salinity and irradiance. However, in the presence of high n-propyl gallate concentration (4 mM), there was a negative effect on all physiological aspects. In contrast, this high concentration of the inhibitor could enhance efficiency of electron transport and growth parameters under high irradiance. On the other hand, with salinity increase, the unfavorable effects of high inhibitor concentration on the efficiency of photosystem II were less evident than of low salinity. Interestingly, n-propyl gallate high concentration had a positive effect on fluorescence and on physiological parameters when high salinities-grown cells were exposed to high irradiance. The results suggest that there is a rational correlation between increase of salinity and algae ability to bypass n-propyl gallate inhibited plastid terminal oxidase function and also direct influence of its lethal concentration on photosystem II compartment. The ability is especially substantial when the increase of salinity is accompanying high irradiance. Furthermore, these data show that algal responses to inhibitor concentrations are different under various environmental conditions.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000300006	
Editor: 	Brazilian Journal of Plant Physiology	
Relação: 	10.1590/S1677-04202012000300006	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Plant Physiology  v.24 n.3 2012	
Fonte: 	info:eu-repo/semantics/openAccess