两种筋力型小麦叶、粒可溶性糖含量及与籽粒淀粉积累的关系

在大田条件下,研究了豫麦34号和豫麦5 0号2种筋力型小麦品种灌浆期旗叶、籽粒可溶性糖含量、淀粉积累速率及粒重的变化。结果表明,小麦旗叶可溶性总糖和蔗糖含量在开花后30d出现高峰,籽粒可溶性总糖和蔗糖含量在灌浆期呈一致的下降趋势,可溶性糖含量变化与籽粒淀粉积累和粒重关系密切。强筋型品种豫麦34号较弱筋型品种豫麦5 0号灌浆期旗叶具有较强的营养物质外运能力,籽粒同样具有很强的转化利用同化物的能力,致使豫麦34号最终的总淀粉含量较高,支链淀粉含量也明显高于豫麦5 0号,粒重达到较高水平。

Soluble Sugar Contents in Leaf and Grain in Two Gluten Wheats and Its Relationship with Grain Starch Accumulation

Field experiment has been conducted to evaluate changes of sugar contents in the flag leaf and grain,as well as grain starch accumulating rate and grain weight of two different gluten-wheat cultivars,Yumai 34 and Yumai 50,during grain filling stage in 2003-2004. The results indicated that peaks of total soluble sugar and sucrose contents in the flag leaf occurred at 30 days after anthesis.Contents of total soluble sugars and sucrose in grain decreased during grain filling stag,soluble sugar contents were closely related with grain starch accumulation and grain weight.The flag leaf of strong-wheat cultivar Yumai 34 during grain filling stage maintained stronger translocation of fertilizer matters and its grain also maintained stronger capacity for translating and using assimilating matters,thus made its total starch reach higher,amylopection contents and its grain weight were higher than weak-gluten cultivar Yumai 50.