Several morphological features were significantly related to the rooting response, and subsequent field performance as rooted cuttings, of shoots collected from hedged stool plants of an F1 hybrid between Pinus caribaea var. hondurensis and P. tecunumanii. Results indicate that it will be possible to manipulate rooting and field performance by shoot selection at the time of harvest of cuttings. The cutting which best meets the objective of maximum rooting without loss of field performance is the terminal segment from a shoot over 30 cm in length, with an actively growing juvenile bud, primary needles in excess of 25 mm, secondary needles present but less than 10 mm in length, and basal diameter over 2 mm. The use of second and third segments of shoots, where these have the appropriate features, would permit greater utilization of material with only a minor decrease in rooting. Primary needle length was the best morphological predictor of both rooting and field height growth. Significant positive genetic correlations suggest that within-family selection for primary needle length will involve selection for clones which root well and which display good height growth in the field, perhaps as a result of slower stool plant aging. For. Sci. 38(1):95-101.

中文翻译：

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热带松插条的芽选择以及生根和田间表现

一些形态特征与生根反应以及随后从加勒比松 F1 杂交种的树篱粪便植物中收集的芽作为生根插条的田间表现显着相关。 hondurensis 和 P. tecunumanii。结果表明，通过在收获插条时进行芽选择来控制生根和田间表现是可能的。最能满足最大生根而不损失田间性能的目标的切割是长度超过 30 厘米的芽的末端部分，具有活跃生长的幼芽，初生针超过 25 毫米，次生针存在但少于 10长度mm，底径超过2mm。使用具有适当特征的芽的第二段和第三段将允许更大程度地利用材料，而生根仅略有减少。初级针长度是生根和田高生长的最佳形态预测因子。显着的正遗传相关性表明，对初级针长度的科内选择将涉及对生根良好且在田间表现出良好高度生长的克隆的选择，这可能是由于粪便植物老化较慢的结果。为了。科学。 38（1）：95-101。