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Lee, Kyeong-Yeoll Korean Society of Applied Entomology 2003 Journal of Asia-Pacific Entomology Vol.6 No.1
Effects of ecdysteroids on two components of the juvenile hormone (JH) biosynthetic pathway were determined during the early stage of fifth instar larvae of tobacco hornworm, Manduca sexta. When ecdysed fifth instars were fed a diet containing nonsteroidal ecdysteroid agonist, RH-5992, the normal decrease of the JH biosynthetic activity in corpora allata (CA) was prevented until day 2 larvae. In addition,20-hydroxyecdysone (20E) directly stimulated CA activity in a long-term culture for 24 hours, and its effect was not influenced by the simultaneous treatment with M. sexta allatotropin (Manse-AT). The Manse-AT mRNA-3, which is one alternatively spliced mRNA among 3 isoforms of the Manse-AT gene, was exclusively present in the terminal abdominal ganglion (TAG) of the fifth instar larvae(Lee and Horodyski, 2002). The level of Manse-AT RNA-3 was increased in the TAG of the larvae which ingested RH-5992. These results suggest that the levels of hemolymph ecdysteroids exert a tropic activity in CA and the TAG and could be associated with the control mechanism of internal physiological changes, such as the nutrientrestricted condition.
Kyeong-Yeoll Lee,Woo-Geun Song,Sukchan Lee,Eunseok Choi 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
The sweet potato whitefly Bemisia tabasi is one of the most important pests of various horticultural crops. In addition, B. tabaci is a vector of many plant-pathogenic viruses and cause a serious secondary damage to crop plants. Association of plant-pathogenic virus with vector insects is known to be effective on the transmission capacity, fecundity, longevity of vectors including whiteflies. However, the interactive mechanisms between virus and vector insects are still poorly understood. Recently, a serious damage caused by virus disease together with B. tabasi emergence was identified at tomato glasshouse in Tongyoung. We detected the signals of Tomato Yellow Leaf Curl Virus (TYLCV) in tomato leaves and vector whiteflies using PCR amplification and confirmed its presence by those sequence comparison. To determine the effects of TYLCV acquisition on physiological status of vector whiteflies, transcript levels of genes that associated with metamorphosis, metabolism, stress and immune processes were compared between TYLCVinfected whiteflies and non-infected ones. Generally, the transcript levels of virus-infected whiteflies were lower than those of non-infected ones. In addition, the associations of endosymbiont levels within whiteflies were discussed in aspect of the acquisition and transmission of TYLCV.
Relationship between plant virus and vector insects : TYLCV transmission by whiteflies
Kyeong-Yeoll Lee 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
Vector-borne plant virus transmission is a complex mechanism. Plant viruses modify development and behavior of vectorinsects in a positive, negative, or neutral manner. Bemisia tabaci transmits Tomato yellow leaf curl virus (TYLCV) whichis a virus that seriously damaged tomato cultivars all around the world. We compared several behavioral and physiologicalcharacteristics between non-viruliferous (NV) and TYLCV-viruliferous (V) of whiteflies. When B. tabaci acquired TYLCV,total life span was shorter and fecundity was lower than NV ones. V whiteflies were more susceptible to thermal stressby increasing hsp mRNA levels but higher in mortality by either heat or cold shocks. Further, V whiteflies increasedthe rates of plant sap probing and light attraction behaviors than NV ones. Our results provide insights to understandvector’s role in relation to the acquisition and transmission of plant viruses.
Global Spread of Begomoviruses via whiteflies and a new route via plant seeds
Kyeong-Yeoll Lee,Jae-Kyoung Shim,M.S. Fatema Khatun,Pijush Kanti Jhan,Hwal-Su Hwang,Sukchan Lee 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
Tomato yellow leaf curl virus (TYLCV) and its vector insect, the sweet potato whitefly Bemisia tabaci, are major threats to tomato and pepper production in all around world. Since the last three decades, both B. tabaci and TYLCV have been invaded into many countries via different routes. Our studies showed that various geminiviruses including TYLCV can be transmissible by seeds as well as whiteflies. Furthermore, commercially developed resistant tomato strains against TYLCV infection can serve as TYLCV reservoirs and potentially influence on TYLCV epidemics. Therefore, transmission pathways through both insect vectors and seeds should be concerned for suitable management of geminiviruses and whiteflies.
Kyeong-Yeoll Lee,Hanna Kim,Yeon-Su Yu 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04
Heating for disinfestation has been practiced of at the condition of 55-60°C for at least 48 hours in various facilities of stored and processed agricultural products. However, it has been required to reduce temperature and time due to the economic efficiency. To improve disinfestation efficiency of heating, we demonstrated whether combined treatments of heat with other agents exert synergistic for disinfestation. Heat treatments were combined with 1 ppm diatomaceous earth (DE), 10 ppm phosphine or 10% carbon dioxide against Plodia interpunctella, Sitophilus zeamais and Tribolium castaneum. Insects were treated single or multiple combinations of each component for 6 h at either 25°C or 40°C, then mortalities were monitored for 14 days post-treatments. Combined treatments greatly enhanced mortalities and shorten killing time of three species rather than single treatments. Particularly, heat treatments with 1 ppm DE and 10 ppm phosphine completely lethal within 3-6 h post-treatments, but heating with 10% CO2 was not much effective. Among three species, S. zeamais adults were more suscpetable to heat but both larvae and adults of T. castaneum was highly susceptible to phosphine. Our results clearly showed that combined treatment of DE or phosphine with mild heating (40°C) greatly improved mortalities of three major stored pest insects and provide advanced techniques for disinfestation of stored product pests.
TYLCV transmission by whiteflies, weeds and seeds
Kyeong-Yeoll Lee,Jae-Kyoung Shim,Sukchan Lee,Eui-Joon Kil,Gwan-Seok Lee,Hong-Soo Choi,Chang-Seok Kim,Jung-Hwan Lee,Ji-Kwang Kim,Kyung-Bon Koo 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.04
Tomato yellow leaf curl virus (TYLCV) causes a highly serious disease in tomatoes in many countries. The most important thing in management is the prevention of virus transmission. TYLCV had been known to be only transmitted by a vector, the sweetpotato whitelfy, Bemisia tabaci. However, we identified two other important routes of TYLCV transmission into tomatoes. It is seed-transmissible. Many seeds available in domestic and global markets were infected by TYLCV. It is also infective into various weeds and other horticultural crops and transmit virus through vector insects. Therefore, we need a new strategy for the virus and vector management.