【摘要】 降低玉米籽粒中植酸磷含量是减少粪磷污染的重要途径,探明施磷与植酸磷积累的关系对于降低植酸磷含量有重要意义。利用田间试验,研究了不同供磷水平对2个玉米品种生长期间不同部位磷含量与籽粒植酸磷积累的影响。结果表明:施用磷肥可以提高2个玉米品种籽粒中总磷和植酸磷的含量以及积累量;金海5号的植酸磷含量与积累量均高于浚单20;植酸磷占全磷的比例在50%~62%之间,高植酸品种金海5号略高于低植酸品种浚单20;随着施磷肥水平的增加,降低了2个品种根、雄穗、穗轴等部位的磷转移率,但各部位转移到籽粒中的总磷的比例受施磷影响较小;玉米乳熟期穗位叶、苞叶、完熟期籽粒磷含量及磷积累量与植酸磷积累量成显著正相关。因此,合理施用磷肥、调控磷素在玉米体内的分配,对于调节玉米籽粒植酸磷积累有重要作用。更多还原

【Abstract】 To decrease the phytic acid P content in maize grain is an important approach to prevent the P-pollution.It is very important to clarify the relationship between the P fertilization and the phytic acid P accumulation in maize grain.By field trials,the phosphorus content and phytic acid phosphorus accumulation of grain of two varieties of maize under different phosphorus levels were studied.The results indicated that Phosphorus fertilization can increase the total phosphorus content,Phytic acid content and accumulation in the grain.Phosphorus content and phosphorus accumulation of Jin-hai 5 is a little higher than that of Xun-dan20.Phytic acid phosphorus account for 50%-62% of the total phosphorus of maize grain.The proportion of Phytic acid phosphorus to total phosphorus in Jin-hai 5 with high phytic acid is higher than Xun-dan20 with low phytic acid.Increasing the phosphorus levels can reduce the phosphorus transfer rate of root,tassel,rachis and other parts of the two varieties of maize.But the percentage of phosphorus in grain transformed from root,leaves,and ear is not affected by phosphorus fertilization.The relationship of phytic acid P accumulation in grain to phosphorus content and accumulation in ear leaf and bracteata leaf at milky stage,and in seed at ripening period is positive significantly.Therefore,rational application of P fertilizer and optimization of P distribution in maize body play an important role in decreasing the phytic acid P content in maize grain.更多还原