The movement of potato virus Y (PVY) in the vascular system of potato plants
The movement of potato virus Y (PVY) in the vascular system of potato plants
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马铃薯Y病毒（PVY）在马铃薯植株维管系统中的运动
DOI：
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发表时间：
2017
影响因子：
1.8
通讯作者：
B. Dupuis
中科院分区：
文献类型：
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作者：
B. Dupuis
马铃薯Y病毒（PVY）是大多数马铃薯种区主要病毒性疾病的罪魁祸首。它是由蚜虫以非持续性的方式传播的，在马铃薯地里，它是由有翅膀的蚜虫从受感染的源植物飞到健康的源植物上传播的。影响马铃薯作物的PVY菌株群有PVYC、PVYN、PVYO、PVYN:O、PVYNTN和PVYN- wi。目前，PVYNTN和PVYN-Wi是欧洲和美国的主要菌株。在叶片感染和病毒积累后，病毒转移到子代块茎上。已知PVYN的易位性优于PVYO，但对其他PVY菌株的易位性知之甚少。PVY的易位在幼苗中比在老植株中发生得快；这种成熟植物的抗性一般可以解释为病毒在叶片中细胞间运动的限制。母块茎可能在解释成熟植株的抗性中起重要作用。PVY能够通过母块茎的维管系统从同一植物的一个茎传递到另一个茎，但茎间的维管联系是否在植物的整个生命周期中是永久性的尚不清楚。为研究PVY在马铃薯维管系统中的传播，建立了两个温室试验。两项试验均采用对pvy敏感的品种Charlotte。结果表明，感染pvy的块茎生长的所有茎迟早都会被感染，PVYN-Wi比PVYNTN更有效地易位到后代块茎上。研究还表明，母块茎在土壤中的逐渐腐烂减少了病毒颗粒通过母块茎的维管系统感染健康茎的可能性。这一新元件有助于更好地理解成熟植物的抗性机制。
Potato virus Y (PVY) is responsible for major viral diseases in most potato seed areas. It is transmitted by aphids in a non-persistent manner, and it is spread in potato fields by the winged aphids flying from an infected source plant to a healthy one. Six different PVY strains groups affect potato crops: PVYC, PVYN, PVYO, PVYN:O, PVYNTN, and PVYN-Wi. Nowadays, PVYNTN and PVYN-Wi are the predominant strains in Europe and the USA. After the infection of the leaf and accumulation of the virus, the virus is translocated to the progeny tubers. It is known that PVYN is better translocated than PVYO, but little is known about the translocation of the other PVY strains. The translocation of PVY occurs faster in young plants than in old plants; this mature plant resistance is generally explained by a restriction of the cell-to-cell movement of the virus in the leaves. The mother tuber may play an important role in explaining mature plant resistance. PVY is able to pass from one stem to the other stems of the same plant through the vascular system of the mother tuber, but it is unknown whether this vascular link between stems is permanent during the whole life of the plant. Two greenhouse trials were set up to study the spread of PVY in the vascular system of the potato plant. The PVY-susceptible cultivar Charlotte was used for both trials. It was demonstrated that all stems growing from a PVY-infected tuber will become infected sooner or later, and that PVYN-Wi translocates more efficiently to progeny tubers than PVYNTN. It was also demonstrated that the progressive decay of the mother tuber in the soil reduces the possibility for virus particles to infect healthy stems through the vascular system of the mother tuber. This new element contributes to a better understanding of the mechanism of mature plant resistance.