Organic Acid Characteristics and Tolerance of Sengon (Paraserianthes falcataria L Nielsen) to Lead
Abstract: This study aimed to
find out the lead tolerance of sengon (Paraserianthes falcataria) seedling
based on growth performance, tolerance index, and secretion and accumulation of
organic acids content. Seedlings were exposed to lead (Pb) with the
concentration of 0, 0.5, 1, 1.5, 5, and 10 mM in liquid nutrient culture for 4
days in order to investigate secretion and accumulation of
oxalic, malic, and citric content, and for 15 days to examine growth
performance and tolerance index. The result showed that tolerance index and
growth performance of sengon seedling were insignificant (p > 0.05) to the
rising of Pb concentration up to 1.5 mM with tolerance index at least 95%, and
even caused an increase of fresh weight.
However, the tolerance index and growth of sengon decreased significantly due to Pb exposure of
5 and 10 mM. Among the three organic
acids, citrate was most dominant as compared to malate and oxalate. Secretion of citrate increased significantly
(p < 0.05) with the rising concentration of Pb 0.5, 1 and 1.5 mM, reaching to 0.464, 0.540, and 0.587 µg mℓ-1,
respectively, or rising according linear line (r = 0.9, p < 0.5). Citrate accumulation showed inconsistent
pattern with the rising Pb exposure. The
result suggested that sengon seedling have a slightly tolerance to lead by
secretion of organic acid especially citric acid.
Author: Luluk Setyaningsih,
Yadi Setiadi, Didy Sopandie, Sri Wilarso Budi
Journal Code: jpkehutanangg120012
