Effect of Copper Sulfate Induction on Phyllanthus tenellus Roxb. Total Phenolic and Flavonoid Content
Yaseer Suhaimi Mohd *
Industrial Crop Research Centre, Malaysian Agricultural Research and Development Institute (MARDI), Malaysia.
Noor Ismawaty Nordin
Industrial Crop Research Centre, Malaysian Agricultural Research and Development Institute (MARDI), Malaysia.
Siti Nurzahidah Zainal Abidin
Industrial Crop Research Centre, Malaysian Agricultural Research and Development Institute (MARDI), Malaysia.
Noor Safuraa Samsudin
Industrial Crop Research Centre, Malaysian Agricultural Research and Development Institute (MARDI), Malaysia.
*Author to whom correspondence should be addressed.
Abstract
Aims: Plants need an appropriate amount of nutrients such as copper for growth and development. However, excess of copper may interrupt plant development and cause stress that led to biochemical compounds being synthesized. The influence of a high copper sulfate concentration on phenolic and flavonoid content in Phyllanthus tenellus plants was investigated.
Place and Duration of Study: The experiment was conducted in a government compound at MARDI Serdang, Selangor, Malaysia (2° 59' 31.7292'' N 101° 41' 56.706'' E), from April 2021 to Jun 2021.
Methodology: The experiment was conducted using a vertical column planting system under a side-netted rain shelter. The plants were subjected to 0.5 M copper sulfate sprayed after 60 days of planting and harvested 0.5, 1.5, 3, 6, 12 and 24 h after sprayed for further analysis. Total phenolic content was calculated as mg gallic acid equivalent and total flavonoid content was measured as quercetin equivalent.
Results: Highest total phenolic and flavonoid content was detected after 0.5 hours of copper sulfate application and started to decrease towards 24 hours after sprayed. Treated samples showed a 1.18-fold increase in total phenolic content and 1.4-fold increase in total flavonoid content compared to control untreated samples after 0.5 hours of sprayed. Control samples showed stability in both total phenolic and flavonoid content throughout the harvesting periods. Phenolic is the major secondary metabolites in Phyllanthus tenellus plants.
Conclusion: Data revealed that the application of 0.5 M copper sulfate is able to enhance total phenolic and flavonoid content in Phyllanthus tenellus plants. The study suggested that the optimum harvesting time is 0.5 hours after copper sulfate application.
Keywords: Phyllanthus tenellus, copper sulfate, phytochemical, antioxidant, induction
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