EXTREME RESISTANCE IS EPISTATIC TO HYPERSENSITIVE RESISTANCE TO POTATO-VIRUS Y-O IN A SOLANUM-TUBEROSUM SUBSP ANDIGENA-DERIVED POTATO GENOTYPE
EXTREME RESISTANCE IS EPISTATIC TO HYPERSENSITIVE RESISTANCE TO POTATO-VIRUS Y-O IN A SOLANUM-TUBEROSUM SUBSP ANDIGENA-DERIVED POTATO GENOTYPE
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DOI：
10.1094/pd-78-1177
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发表时间：
1994-12-01
期刊：
影响因子：
4.5
通讯作者：
WATANABE, KN
中科院分区：
文献类型：
--
作者：
VALKONEN, JPT;SLACK, SA;WATANABE, KN
用极抗马铃薯Y病毒（PVYo）的2X（V-2）7和感PVYo的84.194.30两个二倍体种间杂种杂交后代，测定其对PVYo病毒的抗性。2X（V-2）7的系谱包括马铃薯亚种。andigena（极抗PVYo）和S. t. tuberosum（易感染PVYo）。接种后，34个F-1后代（Ry/ry Ny/ny或Ry/ry ny/ny）和2X（V-2）7（Ry/ry Ny/ny）保持无病毒，并且通过ELISA检测不到病毒，这是由Ry（adg）基因控制的极端抗性的特征。8个后代（ry/ry Ny/ny）在系统感染的叶片中出现落叶、坏死条纹、病变和斑驳症状，这是由Ny基因控制的过敏性抗性的特征。20个后代（ry/ry ny/ny）和84.194.30（ry/ry ny/ny）对PVYo敏感，并出现斑点症状而没有坏死。这些结果表明，对PVYo的极端抗性和过敏性来自S。t. andigena和极端电阻的表达是上位的超敏反应的表达在2X（V-2）7。
Resistance to potato virus Y (PVYo) was examined in diploid potato progeny from a cross of two diploid, interspecific hybrids, 2X(V-2)7 (extremely resistant to PVYo) and 84.194.30 (susceptible to PVYo). The pedigree of 2X(V-2)7 includes Solanum tuberosum subsp. andigena (extremely resistant to PVYo) and S. t. tuberosum (susceptible to PVYo). Following inoculation, 34 F-1 progeny (Ry/ry Ny/ny or Ry/ry ny/ny) and 2X(V-2)7 (Ry/ry Ny/ny) remained symptomless and no virus was detected by ELISA, which is characteristic of extreme resistance controlled by the Ry(adg) gene. Eight progeny (ry/ry Ny/ny) developed leaf-drop, necrotic streaks, lesions, and mottle symptoms in systemically infected leaves, which are characteristic of hypersensitive resistance controlled by an Ny gene. Twenty progeny (ry/ry ny/ny) and 84.194.30 (ry/ry ny/ny) were susceptible to PVYo and developed mottle symptoms without necrosis. These results indicated that extreme resistance and hypersensitivity to PVYo were derived from S. t. andigena and that the expression of extreme resistance is epistatic to the expression of hypersensitivity in 2X(V-2)7.