콩에서 싸리수염진딧물 저항성 유전분석

Genetic Analysis of Foxglove Aphid (Aulacorthum solani Kaltenbach) Resistance in Soybeans

Recent climate changes have resulted in high temperatures, a greater frequency of flooding, and outbreaks of various plant diseasesand insect pests, the latter of which has been characterized by a change in pest type from crop chewing to sap-sucking insects. To date,however, there has been limited study of plant resistance to sap-sucking insects. This study was carried out to evaluate the resistance andgenetic patterns of the foxglove aphid Aulacorthum solani, a sap-sucking pest of soybean. We investigated the growth and reproduction ofthe foxglove aphid on five different varieties of soybean showing either susceptibility or resistance to this aphid in a non-choice test. Geneticanalysis was conducted using the two F2 populations derived from Daepung (susceptible to foxglove aphid) × IT104704 (resistant to foxgloveaphid) and Daepung × IT188399 (resistant to foxglove aphid) crosses, which were evaluated for their responses to foxglove aphids. Differencesin the responses of resistant and susceptible varieties were confirmed by monitoring aphid growth and reproduction. Although the two resistantgermplasms (IT104704 and IT188399) have a strong antibiosis effect, they showed a slight difference with respect to aphid viability. Geneticanalysis of foxglove aphid resistance showed that resistance was governed by a single dominant gene in IT104704 (3:1, p=0.11). We accordinglyidentified two resistant resources showing antibiosis to foxglove aphid, which is reported here for the first time, and also detected differencesin genetic behavior. These results could be useful not only with respect to securing materials showing resistance to the foxglove aphid butalso in the breeding of new foxglove aphid-resistant soybean cultivars.