不同基质、生根剂及其质量浓度对美国红火球紫薇嫩枝扦插生根的交互影响

Orthogonal experimental study on cutting of Lagerstroemia indica

为建立紫薇扦插技术体系,以紫薇为试验材料,剪取粗壮、无病虫害、1年生半木质化嫩枝作为插穗,采用3因素4水平正交试验设计,选用ABT,IAA,IBA,NAA等生根剂;质量浓度为200,400,600,800 mg/L;扦插基质为河沙、蛭石、珍珠岩和椰糠;通过比较紫薇的生根率及根系效果指数,筛选出紫薇最佳基质、生根剂及质量浓度的扦插方案。结果表明:根系效果指数比生根率更能够系统地评价紫薇扦插效果;生根剂是影响紫薇扦插生根的重要因素,扦插基质和生根剂质量浓度对紫薇扦插生根差异不显著;筛选出的紫薇扦插最优方案为生根剂种类为NAA、质量浓度为600 mg/L、扦插基质为蛭石,生根率高达97.79%,平均根长达2.67 cm,根系效果指数为9.10。

In order to establish a cutting system of Lagerstroemia indica,the annual semi-lignified sprouts without pest were used as cuttages. And a three-factor and four-level orthogonal test was conducted by using cuttages treated with rooting agent（ ABT,IAA,IBA or NAA respectively）,with a concentration（ 200,400,600 or 800 mg/L respectively）,and cutting substrate（ sand,vermiculite,perlite or cocopeat respectively）. The rooting rate and root effective index after treatments were also compared. The result showed that root effective index could more systematically evaluate the cuttages＇ rooting effect than rooting rate could; And rooting agent was an important factor affecting rooting while no significant difference in the rooting effect occurred among either substrate or concentration. The optimum cutting scheme as screened out was that the cuttages were dipped with 600 mg/L NAA for 1 min,then planted in the medium as vermiculite. This scheme could bring about a rooting rate of 97.79%,average root length of 2.67 cm with root effective indexes of 9.10.