PVY (Potyviridae: potyvirus) is one of the most important potato virus affecting seed potato production and also it is transmitted non-persistently via aphids. For healthy seed potato production, a virus detection system is highly important in addition to aphid monitoring and control. To achieve this detection method, it need to fast and easy to use. About two decades ago RT-PCR based PVY detection method was developed. However that was very time consuming and has low sensitivity. Here, we developed an advanced PVY detection method which a uses the boiling extraction of the viral RNA from aphid stylet and amplification by specific primers located in the viral capsid protein gene. Therefore, it could directly synthesize cDNA of PVY viral capsid gene from extracted RNA of PVY using one-step RT-PCR method in very short time compared to previous methods due to the omission of RNA extraction step. We confirmed this PVY detection method using the two aphid species (Macrosiphum euphorbiae and Aphis gossypii) that known as PVY vectors. The efficiency of this PVY detection method was 60% to 80% from two the aphid species. Hence, this method could be potentially applied to virus free seed potato production programs.

1980년도부터 우리나라 Burley 종 잎담배산지에서 엽맥에 녹대병상 또는 괴저증상을 나타내는 새로운 병징이 관찰되기 시작하였다. 기주범위조사, 항혈청반응, 물리적성질조사, 복숭아혹진딧물에 의한 전염여부 및 바이러스 입자 관찰을 통해 이들은 서로 병징을 달리하는 PYY의 두가지 계통으로 밝혀졌다. 이 계통들은 잎담배포장에서 자연감염에 의해 나타난 주요병징에 따라 엽맥연대계통 (PVY-VB)과 엽맥괴저계통 (PVY-VN) 으로 명명하였다. PVY 항혈청과 이 계통들의 이병즙액을 반응시킨 결과 양성반응을 나타냈으며 그 반응에서는 두계통간의 차가 없었다. 이들과 병징이 유사한 tobacco etch virus 및 tobacco vein mottling virus 항혈청과의 반응에서는 음성반응을 나타냈다. 전자현미경에 의해 약 730 nm의 사상형 바이러스 입자가 관찰되었으며 그 형태와 크기에는 두 계통간 차가 없었다.

Potato virus Y (PVY) and potato leafroll virus (PLRV) are among the most damaging potato viruses and prevalent in most potato growing areas. In this study, cryopreservation was used to eradicate PVY and PLRV using two cryogenic methods. Potato shoot tips proliferated in vitro were cryopreserved through droplet-vitrification and encapsulation-vitrification using plant vitrification solution 2 (PVS2; 30% glycerol + 15% dimethyl sulfoxide + 15.0% ethylene glycol + 13.7% sucrose) and modified PVS2. Both cryogenic procedures produced similar rates of survival and regrowth, which were lower than those from shoot tip culture alone. The health status of plantlets regenerated from shoot tip culture alone and cryopreservation was checked by reverse transcription-polymerase chain reaction. The frequency of virus-free plants regenerated directly from highly proliferating shoot tips reached 42.3% and 48.6% for PVY and PLRV, respectively. In comparison, the frequency of PVY and PLRV eradication after cryopreservation was 91.3~99.7% following shoot-tip culture. The highest cryopreserved shoot tip regeneration rate was observed when shoot tips were 1.0~1.5 mm in length, but virus eradication rates were very similar (96.4~99.7%), regardless of shoot tip size. This efficient cryotherapy protocol developed to eliminate viruses can also be used to prepare potato material for safe long-term preservation and the production of virus-free plants.