不同栽培措施对小麦籽粒戊聚糖含量的影响

在大田和池栽条件下，以徐州26、宁麦9号、扬麦10号和扬麦9号为试验材料，研究了播期、库源改变和水氮互作对小麦籽粒戊聚糖含量的影响。结果表明，早播或迟播均能显著提高籽粒戊聚糖的含量，分别比适播提高2.13%和8.07%；去小穗处理（减库）显著降低籽粒戊聚糖含量，而剪叶处理（减源）极显著提高籽粒戊聚糖含量，两种情况均存在品种间差异；花后渍水显著提高籽粒戊聚糖含量，提高施氮量则降低其含量，但其降幅随施氮量增加而变小；追施氮肥极显著降低小麦籽粒戊聚糖含量。研究结果表明，栽培措施可能在很大程度上主要通过影响籽粒千粒重调控了戊聚糖含量。

Effect of Different Cultivated Practices on Pentosan Content in Wheat Grains

Pentosan plays important roles in determining quality for baking,forage,beermaking and health food in wheat.In the present study,cultivation practices impacts on pentosan content in wheat grain were investigated based on a serial of field and pool experiments.Cultivars of Xuzhou 26,Yangmai 10,Yangmai 9 and Ningmai 9 were selected with five treatments including sowing date,spikelet and leaf removal,interaction of water stresses and nitrogen,nitrogen rate and nitrogen topdressing were conducted in 2001-2004.The results indicated that early and late sowing treatments significantly increased pentosan content in wheat grains by 2.13% and 8.07% respectively compared with that of period sowing date treatment(Fig.1).As compared with the control,pentosan content with spikelet-removal(sink reduction) treatment was decreased by 9.38% and 6.97% while that in flag leaf-removal(source reduction) treatment was increased by 1.81% and 14.83% in Xuzhou 26 and Yangmai 9,respectively.The main effects of water stress and nitrogen and the interaction effect between water and nitrogen were significant on grain pentosan content.Grain pentosan content in wheat under post anthesis waterloging was 2.87% lower than that of control.Impacts of nitrogen and water interaction on pentosan content differed with cultivars .Grain pentosan content decreased with increasing nitrogen,however the decreasing tendency slowed down with increasing nitrogen.Pentosan content in wheat grains was significantly decreased by topdressing nitrogen.Pentosan content showed linearly correlated to grain weight when single grain weight exceeds 40 mg.In conclusion,these cultivation practices significantly regulated thousand-grain weight and subsequently determined grain pentosan content in wheat.