[Dickison, Virginia; Nie, Xianzhou; Liang, Zengenni] Agr & Agri Food Canada, Potato Res Ctr, Fredericton, NB E3B 4Z7, Canada.
[Xiong, Xingyao; Liang, Zengenni] Hunan Agr Univ, Coll Hort & Landscape, Changsha 410128, Hunan, Peoples R China.
[Singh, Mathuresh] Agr Certificat Serv, Fredericton, NB E3B 8B7, Canada.
[Nie, Xianzhou] Agr & Agri Food Canada, Potato Res Ctr, POB 20280,850 Lincoln Rd, Fredericton, NB E3B 4Z7, Canada.