TY  - GEN
T1  - Possible enhancement of antioxidative activities in medicinal in herbal plant through nitrogen fertilization.
A1  - Jaafar, Hawa ZE
LA  - English
LA  - Malay
UL  - http://discoverylib.upm.edu.my/discovery/Record/oai:psasir.upm.edu.my:26719
AB  - An experiment was designed to characterize the relationship among gluthatione (OSH) production,
oxidized gluthatione (OSSG), total flavonoid, anthocyanin, ascorbic acid and antioxidant activities
(FRAP, DPPH) in three varieties of Labjsja pumila Blume (var. alata,pumila, lanceolata) under
four nitrogen fertilization levels (0, 90, 180,270 kg N/ha). Nitrogen (N) fertilization imposed acute
impact on the production of GSH and GSSG, anthocyanin, total flavonoid and ascorbic acid that
increased steadily with decreasing N level from 270 to 0 kg N/ha. Neither varietal nor its interaction 
with N level being observed. At the highest N level, L. pumila exhibited significantly lower antioxidant
activities than those exposed to limited N-growing condition. Significant positive correlations were
obtained among antioxidant activities, total flavonoid, GSH, GSSG, anthocyanin and ascorbic acid
suggesting an increase in antioxidative activities in L. pumila under low N fertilization could be
attributed to high contents of these compounds. It could also be concluded that the quality of L.
pumila could be enhanced with manipulation of N fertilization, and that excessive N application should be avoided to ensure high herbal quality.
ER  -