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Norman Kamarudin,Siti Nurulhidayah Ahmad,Othman Arshad,Mohd Basri Wahid 한국응용곤충학회 2010 Journal of Asia-Pacific Entomology Vol.13 No.2
The bagworm, Metisa plana Walker (Lepidoptera: Psychidae), is an important pest of oil palms in Malaysia. A serious infestation cause yield declines of 30–40% over 2 years after attack. Successful mass trapping depends on efficient removal of adults, which reduces the chances of mating, eventually causing a decline in the population. This study was conducted in three smallholder blocks where palm age varied from 6 to 16 years. Sticky vane traps were baited with four receptive females of M. plana and placed in three transects within each trapping plot. The percentage of female bags with eggs (i.e., those pupal bags housing the female with eggs that hatched) determined the effects of trapping on mating and reproduction success. Palm yield was compared between the trapping and control plots. The number of live larvae and the percentage of bags with eggs in the trapping plots were always relatively lower (9.1–28.2%) compared to the control plots (28.6– 48.6%). Trapping plots had relatively higher bunch weight (7.8–14.3 kg) compared to the control plots (4.5– 9.2 kg). The bunch weight in the trapping plots increased 22% after trapping compared to 15% in the control plot. Damage ratings on the fronds declined between 35–45% in the trapping blocks. Damage ratings declined between 20% and 27% in most control plots but increased 17% in one of the blocks with an increased bagworm population. There, mass trapping reduces the chances of bagworm mating and oviposition, which leads to lower populations and, therefore, lower frond damage and higher yields.
Aldose reductase inhibition of Rosa hybrida petals and its active component, kaempferol
Norman G. Quilantang,Carlo A. Limbo,이주성,Sonia D. Jacinto,Sung-Kwon Moon,Sanghyun Lee 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.3
The aldose reductase inhibitory activity of extracts from Rosa hybrida petals was evaluated, and a bioactive fl avonoid,kaempferol, was isolated from petals via bioassay-guided isolation. Kaempferol was isolated from the ethyl acetate fractionof R. hybrida and was shown to exhibit strong inhibition against aldose reductase (IC 50 = 0.02 μM). Quantitative analyses ofkaempferol in R. hybrida petals, diff erent fl ower parts, and diff erent Rosa species were also performed using high-performanceliquid chromatography. This study is the fi rst to establish that R. hybrida contains kaempferol and that the light-pinkpetals of this edible rose species exhibit the highest content of the naturally occurring aldose reductase inhibitor. The resultsof this study suggested the potential role of R. hybrida petals in the treatment and management of diabetic complicationsvia aldose reductase inhibition.
Norman G. Quilantang,류서현,박세훈,변재상,전제성,이주성,Joyce P. Rodriguez,윤영석,Sanghyun Lee,이상현 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.6
The methanol extracts of flowers obtained from 67 plant species were screened for their inhibitory activity on aldose reductase(AR). Alnus japonica , Aster spathulifolius , Chionanthus retusus , Morus bombycis , Crysanthemum boreale , Persicariatinctoria , Platycarya strobilacea , and Serratula coronata var. insularis exhibited potent aldose reductase inhibitory (ARI)activity. HPLC-UV analysis of quercetin, an AR inhibitory flavonoid, was performed on extracts showing strong ARI activity. Quercetin was detected in C. retusus , C. boreale , P. tinctoria , and S. coronata var. insularis at concentrations of 1.33,1.56, 0.82, and 3.37 mg g −1 extract, respectively, indicating that quercetin contributed to the ARI activity of these extracts. In the samples in which quercetin was absent, other compounds may be responsible for their potent ARI activity. Theseresults serve as a basis for further studies regarding the bioactive components responsible for the inhibitory eff ects of variousfl ower extracts on AR activity.