Photosynthetica, 2013 (vol. 51), issue 1

Photosynthetica 2013, 51(1):102-108 | DOI: 10.1007/s11099-013-0004-7

Exogenous glycine betaine modulates ascorbate peroxidase and catalase activities and prevent lipid peroxidation in mild water-stressed Carapa guianensis plants

F. J. R. Cruz1, G. L. S. Castro1, D. D. Silva Júnior1, R. A. Festucci-Buselli1, H. A. Pinheiro1,*
1 Centro de Tecnologia Agropecuária, Instituto Sócioambiental e dos Recursos Hídricos, Universidade Federal Rural da Amazônia, Belém, Brazil

The hypothesis that application of exogenous glycine betaine (GBEX) may attenuate the effects of mild water deficit in leaf gas exchange and lipid peroxidation in Carapa guianensis was examined. For this reason, 110-d old plants were sprayed with 0, 25, and 50 mM GBEX and then subjected to two watering regimes. In the first, irrigation was continuously performed to maintain the soil near to field capacity (watered plants). In the second, irrigation was withheld and water deficit resulted from progressive evapotranspiration (water-stressed plants). Treatment comparisons were assessed when predawn leaflet water potential (Ψpd) of stressed plants reached -1.28 ± 0.34 MPa. Regardless of the watering regime, significant (P<0.05) increases in foliar glycine betaine (GBLeaf) concentration were observed in response to increasing GBEX; however, such increases were more expressive in stressed plants. The net photosynthetic rate, stomatal conductance to water vapor, and intercellular to ambient CO2 concentration ratio were significantly lower in water-stressed plants independently of GBEX concentration sprayed on leaves. The application of 25 and 50 mM GBEX caused significant (P<0.05) increases in ascorbate peroxidase (APX) activity in stressed plants, while significant (P<0.05) increases in catalase activity was observed just in the stressed plants treated with 50 mM GBEX. Malondialdehyde concentrations did not differ between watered and stressed plants regardless of GBEX concentration. In conclusion, C. guianensis was able to incorporate GBEX through their leaves and the resulting increases in GBLeaf attenuated lipid peroxidation in stressed plants through positive modulation of APX and CAT activities.

Keywords: antioxidant enzymes; drought; gas exchange; malondialdehyde; oxidative stress

Received: May 30, 2012; Accepted: September 20, 2012; Published: March 1, 2013Show citation

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Cruz, F.J.R., Castro, G.L.S., Júnior, D.D., Festucci-Buselli, R.A., & Pinheiro, H.A. (2013). Exogenous glycine betaine modulates ascorbate peroxidase and catalase activities and prevent lipid peroxidation in mild water-stressed Carapa guianensis plants. Photosynthetica, 51(1), 102-108. doi: 10.1007/s11099-013-0004-7.
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