马铃薯出苗后接受１个月的每日８小时短日照处理并与当时自然光照长度进行比较，研究光照长度对块茎形成及内源激素②的影响，探讨块茎形成与激素水平的关系。结果表明：短日照处理使块茎形成显著提早，但使结薯数减少，植株茎叶生长受抑，块茎淀粉含量降低；短日照处理使叶片中ＡＢＡ含量提早增高，ＧＡ３含量提早减少，ＧＡ３与ＡＢＡ的比值提早显著降低． The potato was exposed to 8-day-a-day short day after emergence for one month and then compared with the natural light length at that time to study the effect of light length on tuber formation and endogenous hormones ②, and the relationship between tuber formation and hormone levels. The results showed that the short-day treatment significantly increased the tuber formation, but reduced the tuber number and inhibited the stem and leaf growth and tuber starch content. The short-day treatment increased the content of ABA and GA3 in the leaves, The ratio was significantly reduced earlier.