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马铃薯退化的原因关于马铃薯退化的原因,已往至少有三种学说:(一)病毒侵染学说,(二)生态条件(高温)诱发学说,(三)自然衰老学说。任何一种学说都不能单独地完满解释所观察到的全部现象。我们目前认为最合理的看法是:不良的生态条件,主要是土壤高温,妨碍马铃薯正常特性的发展,其中特别重要的是它对于皱缩花叶病毒在其体内发展的抵抗性。多数品种的马铃薯的大部分植株在其许多代的无性繁殖过程中,都已经先后受了病毒的侵染,但是在适宜于马
Reasons for Potato Degeneration There are at least three doctrines that have historically been attributed to the degeneration of potatoes: (i) the theory of viral infection; (ii) the inducement of ecological conditions (hyperthermia); and (iii) the theory of natural aging. No one doctrine alone can fully explain all the observed phenomena. We now consider it most plausible that poor ecological conditions, mainly high soil temperatures, hamper the development of normal potato traits, and of particular importance is its resistance to the development of follicular mosaic virus in its own body. Most plants of most varieties of potatoes have been infected with the virus for many generations during their vegetative propagation, but in horses suitable for horses