香榧Torreya grandis 'Merrillii'的扦插繁殖

Cutting-based propagation in Torreya grandis 'Merrillii'

香榧Torreya grandis‘Merrillii’造林多采用培养多年嫁接大苗,尚未在生产上使用扦插繁殖。分别研究了扦插季节、外源植物生长调节物质种类及质量浓度、插穗选择与处理以及基质对香榧扦插生根的影响。结果表明:以当年生枝条为插穗,夏季扦插成活率显著高于其他3季,死亡率低,生根时间较短;夏季以半木质化枝条为插穗,用100.0或200.0 mg·L-1的萘乙酸(NAA)处理香榧插穗,生根率分别为64.4%和55.6%,其生根率与生根质量高于吲哚丁酸(IBA)和双吉尔6号生根粉(GGR6)处理;夏季用2.5 mg·L-1标典3721扦插专用生根液处理香榧带踵枝条15 s,生根率为96.7%,侧根数多,根系发达;秋季硬枝扦插,5种基质配比中以V(泥炭)∶V(珍珠岩)∶V(蛭石)=1∶1∶1生根率和生根指数较好。研究结果说明:香榧扦插繁殖能获得较高的生根成苗率,具有在生产上直接应用的前景,但规模化生产尚需将上述研究结果组合起来开展进一步的研究。

In Torreya grandis ‘ Merrillii ’, large-size grafted plantlets cultured for several years are currently used in forestation, while cutting-based propagation has not been used in production. Effects of different sea-sons for cutting, exogenous plant growth regulators and their concentrations, selection and treatment of cuttings, and media on rooting of cuttings were studied in this paper. Results showed that cutting in summer in T. gran-dis ‘ Merrillii ’ was good using cuttings from less-than-one-year shoots, with a low death rate, a high survival rate and a short rooting time. Semi-woody cuttings treated with NAA at either 100.0 mg . L^-1 or 200.0 mg . L^-1 had a rooting rate of 64.4% and 55.6%, respectively, which had a higher rooting rate and quality than those treated with IBA and GGR6. Cuttings with a part of 2-year-old shoots treated in summer for 15 s with a 3 721 rooting liquid at a concentration of 2.5 mg.L^-1 had a rooting rate of 96.7%, resulting in developed lateral roots and a root system. An optimal medium for hard-wood cutting performed in autumn would be peat ‘ perlite ’ ver- miculite at a proportion of 1 ： 1 ： 1 （ V/ V/ V）, which was good in rooting rate and rooting index. The results in-dicated that T. grandis ‘ Merrillii ’ could get a high rooted plantlet rate by cutting, which had good prospects on direct application to production. But it is necessary to conduct an in-depth study by combining all the re-sults mentioned above for mass production. [Ch, 1 fig. 8 tab. 16 ref.]