不同无性系砧木对马尾松嫁接成活率和接穗生长的影响

Effects of Different Clonal Rootstocks on Grafting Survival Rate and Scion Growth of Pinus massoniana

嫁接在马尾松(Pinus massoniana)无性繁殖技术体系中有重要地位,是当前马尾松种子园营建和优良种质资源收集与保存的关键技术手段。对5个马尾松组培无性系苗木培育的砧木开展嫁接试验,比较不同基因型砧木对嫁接成活率和接穗生长的影响。结果表明,利用马尾松组培苗培育的砧木,其平均嫁接成活率和接穗生长量分别比实生苗砧木提高了22.8%和67.7%;无性系砧木间嫁接成活率和接穗生长量差异显著;各无性系砧木嫁接成活率和接穗生长量的变异系数均低于实生苗砧木。苗期生长表现优异的无性系为PC2和PC3,其嫁接成活率和接穗生长量均表现较好。不同无性系砧木的基因型差异对嫁接效果产生影响;选择生长性状优良的马尾松无性系苗木培育砧木,其嫁接效果更好。

Grafting plays an important role in asexual reproduction technology system of Pinus massoniana,which is the key technique for seed orchard construction and collection and preservation of fine germplasm resources.Grafting experiments were carried out on 5 tissue-cultured clones of P.massoniana to compare effects of different genotypes of rootstocks on grafting survival rate and scion growth.Results showed that average grafting survival rate and scion growth by using tissue-cultured seedlings as rootstocks were 22.8%and 67.7%higher than those using seedlings as rootstocks,respectively.There were significant differences in grafting survival rate and scion growth among clonal rootstocks.Variation coefficients of grafting survival rate and scion growth of clonal rootstocks were lower than those of seedling rootstocks.Grafting survival rate and scion growth of clones PC2 and PC3 with excellent growth traits in seedling stage were higher.Genotype differences of different clones had effect on grafting,and grafting effect could be better by selecting P.massoniana clones with excellent growth traits to cultivate rootstocks.