马铃薯块茎不同部位糖类物质的变化特点

以克新13号马铃薯品种为试验材料,在大田旱作模式下测定出苗后60~90d块茎不同部位糖类物质的含量,研究马铃薯块茎形成过程中不同部位糖类物质变化规律。结果表明：不同糖类在块茎各部位间的含量有差异：不同部位随着生育期的推移淀粉含量均呈上升趋势,髓部最高;蔗糖、可溶性糖含量均呈下降趋势,髓部的蔗糖含量最高,皮层区的可溶性糖含量最高;还原糖、葡萄糖和果糖含量变化均呈单峰曲线,均为皮层区最高。相关分析表明,髓部淀粉含量与还原糖、蔗糖、可溶性糖、葡萄糖和果糖含量呈显著或极显著正相关。说明块茎髓部对淀粉积累起了关键作用。

Carbohydrate Changes in Different Parts of Potato Tuber during Growing Period

In this experiment, "Kexin 13"as the tested material, carbohydrate changes in the potato tubers were studied by measuring the carbohydrate content in different parts of tuber at 60-90d after seedling emergence in the dry field. The results showed that the difference among each part were significant and the starch content of different parts showed a rising trend as the tuber grew, with the highest in medulla; Sucrose and soluble sugar content showed a declining trend, with the highest sucrose content in medulla and the highest soluble sugar in cortex; The change of revertose, glucose and fructose content showed a single peak curve, with the highest content in cortex. Correlation analysis showed that starch content in medulla was significant or extremely significant positive correlation with the revertose, sucrose, soluble sugar, glucose and fructose. The results showed that medulla played a key role in starch accumulation.