Interstock effects on strobilus initiation in topgrafted loblolly pine
2000
McKeand, S. E. (N.C. State Univ., Raleigh (USA). Tree Improvement Cooperative) | Raley, E.M. (Fred)
Grafting scions of new selections of loblolly pine (Pinus taeda L.) into the crowns of sexually mature seed orchard ramets (interstocks) has been a very effective tool for stimulating both male and female strobili one or two years after grafting. Two years of grafting studies evaluating six seed orchard clones as interstocks indicate that there is a strong influence of the interstock clone on the number of strobili produced by the topgrafts. The 1996 study utilized the same six clones in the seed orchard both as topgrafts and interstocks, and clones were grafted in all possible combinations. In 1997, ten 3rd-generation selections were used as the topgraft clones. Each scion clone was grafted into the crowns of three different ramets of the six interstock clones. Male and female strobili were counted each spring through 1999. In both studies, there were strong topgraft clonal effects and interstock clonal effects for total number of strobili. For example, the two best interstock clones stimulated four times as many females as the poorest interstock clone in the 1996 trial. In conventional grafts made on one-year-old seedling rootstocks, there were very few strobili produced. Although there were strong interstock effects, the flowering tendency of the clone was not related to its strobilus stimulation capacity as an interstock, indicating that choosing good flowering clones to use as interstocks will not necessarily result in the best flowering in the topgrafts
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