【摘要】 测定了自然感染花叶病毒（x+y）的马铃薯男爵品种在不同地理（北京和克山）、季节（春播和秋播）和人工控制的土温（25°及15℃）三类条件下形成的退化及未退化块茎中的总氮（TN）、非蛋白质氮（NPN）、蛋白质氮（PN）、氨态氮、醯胺氮（AN）和氨基氮（NH₂—N）的变化。各种条件下形成的退化及未退化块茎中,TN 都没有显著差别,而 NPN 和PN 却有明显变化,退化块茎中 NPN 高于 PN.（NPN）/（PN）值为1.2—1.6;而未退化块茎中 PN 高于 NPN,（NPN）/（PN）值为0.6—1.0。此比值的大小与块茎退化程度成正相关。在进一步的测定中证明 NPN 的升高,主要是 NH₂—N 和 AN 的增加。更多还原

【Abstract】 The writers compared the total-N,protein-N,non-protein-N,ammonia-N,amide-N,andamino-N in the Irish cobbler tubers,degenerated and non-degenerated,naturally infected withX and Y virus.There was no significant difference in the total nitrogen.Protein nitrogen was consistentlylower,and non-protein nitrogen higher,in the degenerated tubers.The ratio of non-proteinN/protein-N,1.2-1.6 in the degenerated tubers and 0.6-1.0 in the non-degenerated tubers,in-dicates non-protein nitrogen being the significant component of the nitrogen in the degeneratedtubers.Amino nitrogen,in further tests,increased to a greater extent than other types ofnon-protein nitrogen in potato degeneration.更多还原