不同生长素处理条件下杂种落叶松生根力的变异  

Effects of Auxin on the Rooting Ability of Hybrid Larch Cuttings

作　　者：孙晓梅[1] 赵海祥 宁延龙 王军辉[1] 王笑山[1] 王玉芝 

机构地区：[1]中国林业科学研究院林业研究所国家林业局林木培育重点实验室,北京100091 [2]河北省隆化县茅荆坝林场,隆化068150

出　　处：《林业科学》2009年第9期142-146,共5页Scientia Silvae Sinicae

基　　金：国家"十一五"科技支撑课题(2006BAD01A14)

摘　　要：Five 5.5-year-old hybrid families seedling ortets in larch nursery of Maojingba forest farm,Hebei Province,were used as regenerating materials in this experiment,the effect of IBA concentration and soaking time on rooting of semi-hardwood cuttings of hybrid larch and the response of different hybrid families to auxin treatment were systematically studied,and the genetic parameters of rooting under different auxin treatments were estimated. The results showed that suitable IBA treatment had an obvious effect on accelerating rooting and root development of hybrid larch cuttings. Rooting percentage increased with enhancing IBA concentration or extending soaking time,but decreased when reaching a certain concentration and soaking time. The root number increased with enhancing IBA concentration or extending soaking time,however,one-sided rooting percentage had reverse trend. Rooting percentage and root development of Larix kaempferi 73-2×Hybrid 93-16 were better than other hybrid families,the percentage of rooted cutting was up to 94% and mean root number per cutting was 5.3 by 200 mg·L-1 IBA soaked with 20 min. The following hybrid family was L. kaempferi 12 ×L.gmelinii 9,whose percentage of rooted cutting was up to 87% and mean root number per cutting was 4.8 by 400 mg·L-1 IBA soaked with 30 min. Genetic parameters of rooting traits changed greatly under the different auxin treatments,the trend of changes in the heritability of root number and rooting percentage with the IBA concentration and soaking time was similar to the root number and rooting percentage by the different auxin treatments.Five 5.5-year-old hybrid families seedling ortets in larch nursery of Maojingba forest farm,Hebei Province,were used as regenerating materials in this experiment,the effect of IBA concentration and soaking time on rooting of semi-hardwood cuttings of hybrid larch and the response of different hybrid families to auxin treatment were systematically studied,and the genetic parameters of rooting under different auxin treatments were estimated. The results showed that suitable IBA treatment had an obvious effect on accelerating rooting and root development of hybrid larch cuttings. Rooting percentage increased with enhancing IBA concentration or extending soaking time, but decreased when reaching a certain concentration and soaking time. The root number increased with enhancing IBA concentration or extending soaking time, however, one-sided rooting percentage had reverse trend. Rooting percentage and root development of Larix kaempferi 73-2 x Hybrid 93-16 were better than other hybrid families, the percentage of rooted cutting was up to 94 % and mean root number per cutting was 5.3 by 200 mg·L- 1 IBA soaked with 20 rain. The following hybrid family was L. kaempferi 12×L. gmelinii 9, whose percentage of rooted cutting was up to 87 % and mean root number per cutting was 4.8 by 400 mg· L- 1 IBA soaked with 30 min. Genetic parameters of rooting traits changed greatly under the different auxin treatments, the trend of changes in the heritability of root number and rooting percentage with the IBA concentration and soaking time was similar to the root number and rooting percentage by the different auxin treatments.

关 键 词：杂种落叶松 IBA 浓度 处理时间 生根力 遗传变异 

分 类 号：S723.132[农业科学—林木遗传育种] S718.46[农业科学—林学]