INRA - Recherches Forestières de Bordeaux, Laboratoire de Génétique et Amélioration des Arbres Forestiers, Pierroton, 33611, Gazinet Cedex, France.
Theor Appl Genet. 1996 Mar;92(3-4):347-56. doi: 10.1007/BF00223678.
The relationship between inbreeding depression and inbreeding coefficient (F) for several important traits was investigated in an 11-year trial of maritime pine (Pinus pinaster). Five levels of inbreeding (F=0; 0.125; 0.25; 0.5; 0.75) were obtained in a mating design involving ten plus-trees, or their progenies, as parents (total of 51 families). For F=0.75, the mean inbreeding depressions were 27% for height, 37% for circumference at breast height (63% for bole volume), 23% for basal straightness (better straightness of the inbred trees), and 89% for female fertility (number of cones). Large differences were observed among inbred families for the same level of inbreeding. The evolution of depression with F was more or less linear, depending on the traits. Significant differences among F-levels appeared very early for height (from 5-years of age). Inbreeding depression was much more expressed during unfavorable years than during favorable years for yearly height growth. When compared with other Pinus species, maritime pine appears to be less affected by inbreeding, especially for the percentage of filled seeds and general vigor. A reduced genetic load in maritime pine may result from the evolutionary history of the species and its scattered distribution.
在一项为期 11 年的海洋松（Pinus pinaster）试验中，研究了近亲繁殖衰退与近亲系数（F）之间的关系。在涉及十棵以上的树木或其后代作为亲本的交配设计中，获得了五个近亲繁殖水平（F=0；0.125；0.25；0.5；0.75）（共 51 个家系）。对于 F=0.75，高度的平均近亲繁殖衰退率为 27%，胸径周长的近亲繁殖衰退率为 37%（树干体积的近亲繁殖衰退率为 63%），基部直度的近亲繁殖衰退率为 23%（即树木的直度更好），雌性结实率（种子数量）的近亲繁殖衰退率为 89%。在同一近亲繁殖水平下，不同的近亲繁殖家系之间存在很大差异。近亲繁殖衰退随 F 的演变或多或少呈线性变化，这取决于性状。高度的差异在 5 岁时就非常明显（F 水平）。在不利于树木生长的年份，近亲繁殖衰退比在有利于树木生长的年份更为明显。与其他松属物种相比，海洋松受近亲繁殖的影响较小，尤其是在种子饱满度和整体活力方面。海洋松的遗传负荷较低可能是由于该物种的进化历史及其分散的分布所致。
