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木薯的价值在于其块根内高含量的淀粉。木薯淀粉不仅可以作为粮食,还可以作为原料制造乙醇燃料等。但是其块根中淀粉高效累积生化机制依然有待于解决。本研究比较性研究了大田生长的高、低淀粉木薯品种在4个生长关键时期的蔗糖和淀粉代谢相关的酶活性。结果表明,根中的淀粉合成途径的限速步骤酶腺苷二磷酸葡萄糖焦磷酸化酶(ADPGase)活性、叶部的蔗糖磷酸合成酶(SPS)活性与木薯块根内的淀粉含量呈正相关关系,而根淀粉降解酶活性则呈负相关关系。该研究表明通过提高根中的ADPGase和叶中的SPS活性,同时降低块根中的淀粉降解酶活性有可能可以提高木薯块根中的淀粉积累。
The value of cassava lies in the high content of starch in its roots. Tapioca starch can not only be used as food, but also can be used as raw materials to produce ethanol fuel. However, the efficient biochemical mechanism of starch accumulation in root tuber remains to be solved. In this study, we compared the enzymatic activity of sucrose and starch metabolism in high and low starch cassava varieties grown in the fields at four key growth stages. The results showed that ADPGase activity, sucrose phosphate synthase (SPS) activity in leaf and starch content in cassava root were positively correlated with the rate-limiting step of starch synthesis path in roots, While the activity of starch degrading enzyme was negatively correlated. This study shows that it is possible to increase starch accumulation in cassava roots by increasing ADPGase in roots and SPS activity in leaves, while reducing starch degrading enzyme activity in roots.