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为增强后代的生活力,充分保证异花授粉,防止近亲繁殖,建立种子园时,必须采用多数无性系,并使每一无性系周围为其他不同的无性系所包围,以防止自花授粉;此外,还应注意所用优树应具有广泛的遗传结构,以取得较为显著的遗传改良效果。据根导,在松类中发现较普遍地存在着强的一般配合力,或个别存在显著的特殊配合力。在火炬松中,就有个别无性系产生的后代表现优异,如在一个种子园中随机收集种子,
In order to enhance the vitality of future generations, fully guarantee cross-pollination and prevent inbreeding, the establishment of seed orchards must use most clones and surround each clonal around with other different clones to prevent self-pollination; In addition, it should be noted that the elite tree should have a wide range of genetic structure, in order to achieve more significant genetic improvement. According to the root guide, it is found that there is a strong general combining ability among pine species, or there is a distinct special combining ability among individual species. In the loblolly pine, there are individual clones produced offspring outstanding performance, such as in a seed orchard random collection of seeds,