The synchronized tuberization system of in-vitro single-node cuttings of potato plantlets was used to investigate the effects of photoperiods and time of 8% sucrose induction to tuberization. The experimental results showed that as the days of 8% sucrose induction increasing the percentage of tuberization and average fresh weights of tubes increased gradually (Fig 1,2). 8%sucrose induction of tuberization is not finished in a minute, but had a time accumulative effect. After inducted in TD(total dark) and 8%sucrose different hours the single-node cuttingsware turned to 3% sucrose, TD ,SD(short day), LD(long day) to culture separately, the percentage of tuberization and intensity of induction of tuberization ware record in the 7th day and 14th day separately(Table 1, Fig3,4,5,6)).These results indicated that TD was the best light treatmant. In it the percentage of tuberization was the hightest(Yable 1). 8%sucrose and SD was favourable to induction stolons .There was no tuberization in it, while all the cuttings ware inducted and developed to stolons (Table 1).In LD part cuttings tuberized(Table 1).%以马铃薯大西洋(Solanum tuberosum L.cv.Atlantic)单节茎段培养为实验体系,记录Y8%蔗糖处理不同时间及TD,SD,LD下对结薯情况影响的差异。TD是诱导结薯的最佳光照处理,块茎生成百分率最高,诱导强度最高,薯块白色,多无柄。诱导结薯不同处理时间后转入LD条件下,能结薯,块茎生成率低,紫红色,多保龄球状。诱导结薯不同处理时间后转入SD条件下,没有块茎生成,全部长成匍匐茎。8%蔗糖诱导结薯不是短时瞬间完成的。而存在时间上的数量累加效应。
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