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对南方松类大部分遗传改良计划来说,改良的种子是由优树接穗嫁接建立的种子园产生的.但迄今为止,对优树选择和接穗的收集注意较多,而对嫁接所用的砧木类型则研究的不多.一个多世纪以来,选择砧木和中间砧已被用作提高果树早期产量和限制树形的大小(Sax 1958).Ahlgren(1962,1972)发现在某些北方松属树种中,砧木影响球花的产生和成活,有时还会影响生殖物候学.Holzer(1970)发现,瑞士五针松接穗嫁接在乔松和欧洲赤松上,其开花和生长均比嫁接在本砧、欧洲黑松、美国五针松上的好.Dyson(1975)观察到,展松嫁接在辐射松上通常会变矮,但开花时间与嫁接在本砧上相同.用短叶松和火炬松(Schmidtling 1969,1973)进行研究表明,砧木对接穗的生长和结实性均有影响.材料和方法在1969、1970和1973年分别进行了一些研究,以便确定不同树种和家系的砧木对火炬松接穗的成活、生长和结实性的影响.1969年,对3个火炬松无性系进行了嫁接,1970和1973年对2个不同无性系进行了嫁接.在3年的嫁接中,所用的火炬松砧木大部分是半同胞和全同胞的家系(见表1).同时,也用了湿地松砧木.其它还有短叶松、晚松、光松、弗吉尼亚松、刚松及日本赤松(见表1).
For most genetic improvement programs of southern pine, the improved seeds are produced from seed orchards established by the grafting of elite trees, but so far, more attention has been paid to the selection of elite trees and the collection of scions, whereas for rootstocks used for grafting The types have not been studied much. For more than a century, the selection of rootstocks and intermediate anvils has been used to increase fruit tree early yield and to limit tree size (Sax 1958) .Ahlgren (1962, 1972) found that in some northern species , Rootstocks affect the production and survival of globe flowers, and sometimes affect reproductive phenology.Holzer (1970) found that the Pinus sylvestris grafted on Qiao Song and Pinus densiflora, its flowering and growth are grafted than the anvil, European black pine, the United States on the five pin loose good .Dyson (1975) observed that the stretch of pine grafted on the pine is usually shorter, but the flowering time and the grafting on the same anvil with pine and loblolly pine ( Schmidtling 1969, 1973) showed that rootstocks had an effect on the growth and seedability of the scion Materials and Methods Several studies were conducted in 1969, 1970 and 1973, respectively, to determine the effect of rootstocks from different species and families on the scion Survival, growth and In 1969, three Pinus taeda clones were grafted, and two different clones were grafted in 1970 and 1973. The majority of half-sibling loopholes used during the three-year grafting (See Table 1), and also used P. elliottii rootstocks, as well as Pinus tabulaeformis, Pinus sylvestris, Pinus thunbergii, Pinus virginiana, Pinus sylvestris and Pinus sylvestris (Table 1).