The application of phosphorus and potassium to increase drought tolerance in Pereskia bleo (Kunt) DC with proline and antioxidant indicators

Sulandjari1,2, A T Sakya1 and D H Prahasto1

1 Department of Agrotechnology, Agricultural Faculty, Sebelas Maret University, Jl. Ir. Sutami 36 A, Kentingan, Surakarta, 57126, Indonesia
2 Corresponding author: sulandjari@staff.uns.ac.id ; sulandjarimb@gmail.com


Abstract. The El Nino anomaly caused a decrease in rainfall and the occurrence of irrigation water drought. Pereskia bleo leaves contain high antioxidants. Proline in leaf tissue plays a role in reducing osmotic potential and maintaining cell turgor. Potassium can regulate the osmotic pressure and turgor, whereas Phosphate deficiency and drought will reduce the result of photosynthesis. This study aims to assess the role of Potassium and Phosphate in the tolerance and dynamics of secondary metabolites in P.bleo under drought conditions. The study was conducted from April to July 2018. The drought was artificially induced by controlling watering treatment for 30% and 60% field capacity once every 3 days after the plants are two months old. Using a Nested Randomized Complete Block Design. Fertilizing of KCl and SP36 are nested into 3 doses of each (0; 1.5 and 3 ) g/polybag at the beginning of planting. The results showed that the drought reducing plant growth but in contrast raising the levels of proline and antioxidants. There was an interaction between Potassium and Phosphate in the treatment of drought. Applying fertilizer Phosphate and Potassium could improve P.bleo tolerance to drought.

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