【摘要】 水稻主季稻留桩高度是影响再生稻高产的重要因素之一。以两系杂交稻组合培两优210为研究材料,在主季稻收割时设3个留桩高度处理(40 cm、20 cm和10 cm),研究主季稻留桩高度对再生稻产量及源库性状的影响。结果表明,随留桩高度的降低,(1)培两优210再生稻生育期延长,株高、穗长与叶面积指数增加;(2)灌浆期间叶片磷酸蔗糖合成酶活性衰减率减小,作物生长率增加,节间维管束数目和大小及枝梗过氧化氢酶活性增加;(3)茎鞘非结构碳水化合物积累和输出速率增加,比叶重和粒叶比提高,穗总粒数增加,进而增加产量。两系杂交稻培两优210作中稻栽培时其适宜留低桩,留桩高度10 cm处理再生稻具有"源"足"流"畅"库"大的特点。更多还原

【Abstract】 Rudimental stubble height of rationing rice is one of important factors on high-yielding cultivation.Effects of rudimental stubble heights on the yield and source-sink characteristics of ratooning rice were studied in two-line hybrid rice Peiliangyou 210.Three rudimental stubble heights were arranged in the study,which were 40 cm,20 cm,and 10 cm respectively.The results indicated that rudimental stubble heights affected source-flow-sink characteristics of ratooning rice significantly.With the decreasing of rudimental stubble heights,(1) the growing stage of ratooning rice was postponed,but stubble height,spike length and leaf area index(LAI) were increased,(2) the activities of leaf sucrose-phosphate synthetase(SPS) decreased,while the crop growth rate and the number and area of big vascular bundle of different internodes and the activity of catalase were increased during the grain filling stage.(3) the accumulation and output rates of non-structure carbohydrate content in stem and sheath,the ratio of grain number to leaf area and specific leaf weight,the spikelets per panicle and the yield were increased.In Changsha region,the suitable rudimental stubble height of two-line hybrid rice Peiliangyou 210 is 10 cm.更多还原