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以紫花白和晋薯２号两个品种为材料，研究了马铃薯同一个体植株中，处于不同生长阶段上的块茎，其内源ＧＡ３和ＡＢＡ含量的变化规律．结果表明：开始形成的块茎（块茎直径１ｃｍ左右）中ＡＢＡ和ＧＡ３含量最高，但ＧＡ３／ＡＢＡ的比值则较低；之后随着块茎的膨大，ＡＢＡ和ＧＡ３的含量均逐渐降低，但ＡＢＡ的降低速度大于ＧＡ３，从而使ＧＡ３／ＡＢＡ的比值逐渐增高，到块茎成熟时，ＡＢＡ和ＧＡ３都有所增加。而由块茎迅速膨大到成熟的过程中，ＧＡ３／ＡＢＡ的比值则又逐渐降低。两个品种在块茎生长过程中，内源ＧＡ３和ＡＢＡ的含量具有相似的变化规律．成熟期块茎平均直径较大的紫花白，当块茎直径小于５ｃｍ左右时，其中ＧＡ３的含量大于相应大小的晋薯２号，后期两个品种之间则基本无差异；而ＡＢＡ的含量在两个品种之间则始终无多大差异；因此使ＧＡ３／ＡＢＡ的比值在块茎直径小于５ｃｍ以前紫花白大于晋薯２号。因此我们认为ＧＡ３和ＡＢＡ在块茎开始形成与膨大及成熟的整个生长过程中，对块茎的形成和生长发育具有负反馈调节与协同作用．
Two varieties of purpurea and Jinshu 2 were used as materials to study the variation of endogenous GA3 and ABA contents in tubers in different growth stages of the same potato. The results showed that the content of ABA and GA3 in tubers (tuber diameter about 1cm) was the highest, but the ratio of GA3 / ABA was lower. Then the content of ABA and GA3 decreased gradually with tuber expansion, but ABA decreased The rate of GA3 / ABA was higher than that of GA3, and ABA and GA3 increased as tubers matured. However, the ratio of GA3 / ABA decreased gradually after tubers expanded rapidly to maturity. During the tuber growth of two cultivars, the content of endogenous GA3 and ABA had similar changes. When the tuber diameter was less than 5cm, the content of GA3 was larger than the corresponding size of Jinshu 2, but there was no difference between the two varieties at the later stage. The content of ABA in two Varieties are always not much different between; so GA3 / ABA ratio in the tuber diameter of less than 5cm purple before white potato than Jin 2. Therefore, we believe that GA3 and ABA have negative feedback regulation and synergistic effect on the formation and growth of tubers during tuber initiation and enlargement and maturation.