Abstract
Amino acids are important components of mangrove plant metabolisms. The aim of this study was to determine the relationship of mangrove R. mucronata leaf colors to the amino acid content. This study was conducted between March to August 2019. The leaves were taken 50 g. The assessment of Amino acids was conducted using UPLC Waters Acquity Class H with PDA Detector. The principal component analysis (PCA) was used to determine the relationship analysis between R. mucronata leaf colors and amino acid concentrations. The largest content was L glutamic acid with a green leaf content of 6139.57 ± 694.17 mg/kg and yellow leaf content of 6105.013 ± 113.2058 mg/kg. The results of PCA 1 showed that the influential amino acids were L-threonine (0.94), L-tyrosine (0.96), L-alanine (0.92), L-vanin (0.93), and PCA 2 showed glutamic acid (0.91). These results indicated that the difference in mangrove leaf colors affects the amino acid contents in the leaves.
Highlights
Mangroves are distributed in tropical and sub-tropical tidal zones, mostly on the East coast of Northern Sumatra, Indonesia
The second-largest amino acid content was L-leucine with green leaf content of 5894.143 ± 355.2384 mg/kg and yellow leaf content of 5301.183 ± 174.1504 mg/kg
Green leaf had the lowest histidine content compared to the others which were 3%, while yellow leaf had the lowest L-tyrosine content of 2%
Summary
Mangroves are distributed in tropical and sub-tropical tidal zones, mostly on the East coast of Northern Sumatra, Indonesia. Rhizophora mucronata is very important locally as a source of wood and non-wood products for the community. R. mucronata is a mangrove species that grows towards the sea on the coast and should be expected to be in the first line to experience the effects of global climate change, mainly due to rising sea levels [1]. Mangroves are the main source of carbon, vitamins, minerals, proteins, essential fatty acids, and energy that can be utilized for organisms and humans. Mangrove ecosystems have contributed to primary productivity in the aquatic environment in the form of leaf litters [2][3] and the litter experiences decomposition [4]. Mangroves contain various chemical compounds that can be used as medicine [5]; spawning grounds and nurseries for many fish and mollusks [6 - 8]
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