多效唑对小麦叶片衰老及产量的影响

为探明多效唑(PP333)对小麦叶片衰老生理生化及产量的影响,在小麦拔节期,以不同质量浓度(0,100,200和400 mg/L)的多效唑水溶液进行叶面喷施处理,分别测定扬花后不同天数小麦旗叶的叶绿素含量、净光合速率、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、丙二醛含量(MDA)、可溶性蛋白质以及与产量性状相关的指标。结果表明,适当质量浓度(100,200 mg/L)的多效唑处理能有效地延缓小麦灌浆至成熟期旗叶叶绿素含量和净光合速率的下降,增强了超氧化物歧化酶和过氧化氢酶的活性,有效地抑制了膜脂氧化,从而使得小穗数、穗粒重、千粒重等性状比对照明显提高。

Effect of Paclobutrazol on Leaf Senescence and Yield of Wheat

To determine the effect of the Paclobutrazo1 on wheat physiological and yield,during the wheat elongation stage,different concentration of the Paclobutrazo1 solution(0,100,200 and 400 mg/L) were sprayed on the wheat leaves,the content of chlorophyll,net photosynthetic rate,superoxide dismutase activity(SOD),catalase activity(CAT) of the flag leaf,the content of malondialdehyde(MDA),soluble protein content and the index on economic output in the seeds were measured in different periods after spraying.The results showed that proper concentrations of the Paclobutrazo1(100,200 mg/L) could delay the decrease of chlorophyll content and net photosynthetic rate,increase the SOD activity and CAT activity,and inhibit the lipid peroxidation effectually.Consequently,the spikelets and grain weight and 1 000-grain weight etc.improved significantly than that of the control without Paclobutrazo1.