Studies on the dynamic changes of soluble sugar contents in leaf, stem and grain in different winter wheats and the relationship with grain starch contents

中国人. 比较了3种类型专用小麦（强筋小麦郑麦9023、中筋小麦温麦4号和弱筋小麦豫麦50）在籽粒灌浆过程中旗叶、倒一茎节、倒二三茎节、倒四五节茎节、叶鞘中可溶性总糖和蔗糖含量及籽粒中可溶性总糖、淀粉含量的变化。结果表明，在灌浆过程中，中筋小麦温麦4号和弱筋小麦豫麦50旗叶中可溶性总糖、蔗糖、SS和SPS活性均高于强筋小麦郑麦9023，温麦4号略高于豫麦50。SS和SPS活性峰值出现时间早于可溶性总糖和蔗糖。在花后12 d至成熟期间，豫麦50籽粒中可溶性总糖含量最高,温麦4号次之，郑麦9023最低；豫麦50淀粉含量显著高于温麦4号和郑麦9023，灌浆后期的ADPP活性也高于温麦4号和郑麦9023。相关分析表明，开花后18 d至成熟期茎中可溶性总糖含量与籽粒淀粉含量之间呈极显著负相关，而叶片中可溶性总糖、叶片中蔗糖、籽粒中可溶性总糖与籽粒淀粉积累速率呈显著或极显著正相关。茎鞘可溶性总糖含量对籽粒淀粉的贡献率存在基因型差异：豫麦50和郑麦9023以倒二、三节间最大，而温麦4号则以倒四、五节间最大。

英语. Three wheat cultivars differing in grain protein content, Zhengmai 9023(strong-gluten wheat), Wenmai 4 (medium- gluten wheat)and Yumai 50 (weak-gluten wheat) were used in an experiment to study the dynamic changes of total sugar content and sucrose content in the flag leaf, stem, sheath and grain and the starch content in grain. Result showed that, the total soluble sugar and sucrose content in flag leaf in Wenmai 4 and Yumai 50 were higher than that in Zhengmai 9023, and the activities of sucrose(SS) and sucrose-phosphate (SPS) activity in flag leaf showed the same dynamic trend during filling stage.The time that the maximum of SS and SPS activity occurred was earlier than that of total soluble sugar content and sucrose content. Twelve days after anthesis the total soluble sugar content in grain of Yumai 50 was highest but that was lowest in Zhengmai 9023. During the filling stage the starch content in grain of Yumai 50 was highest among the three wheat cultivars, and the activity of adenosine diphosphorate glucose pyrophrylase (ADPP) showed the same trend during the later fiiling stage. The correlation analysis showed that there was a negative correlation between the total soluble sugar content in stem and the starch content in grain, and there was also a positive correlation between the total soluble sugar content in leaf, the sucrose content in leaf, total soluble sugar content in grain and the starch accumulating rate in grain after eighteen days after anthesis. The quantity and contribution to grain starch yield of remobilized total soluble sugar from top of 2nd and 3rd nodes of wheat stem in Yumai 50 and Zhengmai 9023 were the highest, but the quantity and contribution to grain starch yield of remobilized total soluble sugar from top of 4th and 5th nodes of wheat stem of Wenmai 4 were the highest.