Tsai C Y, Nelson O E
Science. 1966 Jan 21;151(3708):341-3. doi: 10.1126/science.151.3708.341.
The maize mutant shrunken-2 synthesizes only 25 to 30 percent as much starch as normal maize; it completely lacks adenosine diphosphate glucose pyrophosphorylase activity in both endosperm and embryo tissue. Identification of the mutant block indicates that the greater portion of starch in the endosperm of normal maize is synthesized by way of enzyme systems that utilize adenosine diphosphate glucose as a substrate, and that the latter is formed chiefly by adenosine diphosphate glucose pyrophosphorylase.
玉米突变体皱缩-2合成的淀粉量仅为正常玉米的25%至30%；其胚乳和胚组织中完全缺乏二磷酸腺苷葡萄糖焦磷酸化酶活性。对该突变阻断的鉴定表明，正常玉米胚乳中大部分淀粉是通过以二磷酸腺苷葡萄糖为底物的酶系统合成的，并且后者主要由二磷酸腺苷葡萄糖焦磷酸化酶形成。
