Photosynthetica 2009, 47(2):304-308 | DOI: 10.1007/s11099-009-0047-y

Effects of rapidly imposed water deficit on photosynthetic parameters of three C4 grasses

A.S. Soares-Cordeiro1,*, A.E. Carmo-Silva1,2, A. Bernardes da Silva1, J. Marques da Silva1, A.J. Keys2, M.C. Arrabaça1
1 Centro de Engenharia Biológica and Departamento de Biologia Vegetal, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal
2 Department of Plant Sciences, Centre for Crop Genetic Improvement, Rothamsted Research, Harpenden Hertfordshire, UK

Water deficit, when rapidly imposed on three C4 grasses of the different metabolic subtypes, Paspalum dilatatum Poiret (NADP-malic enzyme), Cynodon dactylon (L.) Pers (NAD-malic enzyme) and Zoysia japonica Steudel (phosphoenolpyruvate carboxykinase), caused decreases in photosynthetic rates, in the quantum yield of PS II and photochemical quenching, and in the activities of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and phosphoenolpyruvate carboxylase (PEPC). The results provide evidence for non-stomatal limitations of photosynthesis differing in nature between the three species.

Additional key words: chlorophyll a fluorescence; drought stress; NAD-malic enzyme; NADP-malic enzyme; phosphoenolpyruvate carboxykinase; phosphoenolpyruvate carboxylase; photosynthetic capacity; Rubisco

Received: October 23, 2008; Accepted: June 9, 2009; Published: June 1, 2009  Show citation

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Soares-Cordeiro, A.S., Carmo-Silva, A.E., da Silva, A.B., da Silva, J.M., Keys, A.J., & Arrabaça, M.C. (2009). Effects of rapidly imposed water deficit on photosynthetic parameters of three C4 grasses. Photosynthetica, 47(2), 304-308. doi: 10.1007/s11099-009-0047-y
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