关于马铃薯种性退化的原因,病毒侵染学说已被多数人所接受,认为病毒的侵染是退化的根据,在病毒充分侵染的情况下,高温和其它生态因子是促使不同程度的退化症状表现出来的外因条件。试验证明,没有病毒的充分侵染,无论生态因子如何,马铃薯的种性并不发生退化。东北农学院曾用天然实生籽单株块茎系做材料进行试验,结果,无毒种薯株虽经高温(土温25℃)连续处理二年,种性并未退化,单株产量变化不大,而当人工接种X病毒、Y病毒和X+Y病毒后,在25℃土温条件下,第二年即表现严重的皱缩花叶,单株块茎产量急骤下降。不少研究还证明,病毒在植株体内有累计作用。因此,在现阶段,提高马铃薯的产量,首要的问题就是防止种性退化。而实生薯利 Regarding the reasons for the degenerative potato, the theory of virus infection has been accepted by most people. It is considered that virus infection is the basis of degradation. Under the condition of full virus infection, high temperature and other ecological factors promote different degrees of degenerative symptoms The external conditions shown. Experiments show that, without full virus infection, regardless of ecological factors, the nature of the potato does not degenerate. Northeastern Agricultural College had used the seedlings of natural seedlings to make the material test, the results, non-toxic seed potato strain despite the high temperature (soil temperature 25 ℃) for two consecutive years, the species did not degenerate, yield per plant little change However, when X-virus, Y-virus and X + Y virus were inoculated by human, severe foliar leaf mosaic appeared in the second year under the soil temperature of 25 ℃, and the tuber yield of one plant dropped suddenly. Many studies have also shown that the virus accumulates in the plant body. Therefore, at the present stage, the most important issue for increasing potato yields is to prevent degeneration. The real potato profits