油松种子园无性系花期同步指数稳定性分析

Flowering synchronization stability of clones among plant ages in a seed orchard of Pinus tabulaeformis

种子园无性系花期的同步性是保证其种子批遗传品质和产量的重要基础,研究其变异与不同株龄间的稳定性和影响因子对于无性系的管理与利用有实际意义。根据一油松种子园49个无性系跨度13年的花期、花量调查结果,分析了各无性系不同株龄的花期同步指数。结果表明:无性系组合间异性花期同步指数有较大差异;无性系作为父本时的花期平均同步指数整体上高于作为母本时的同步指数;多数无性系内具有高于异交平均水平的自交机会;无性系作为母本的同步性指数在株龄间较稳定,大量结实初期的母本花期同步指数可以作为选择的参考,但选择较高母本花期同步指数无性系时,其父本的花期同步指数则会相对较低。种子园无性系花期同步指数分析在种子园管理和改良种子园建设中有广泛的利用潜力。

Flowering synchronization is essential for genetic management and deployment of clones in seed orchard.Studying variation and stability of flowering synchronization of clones among plant ages are helpful for further management of clones in present seed orchard and backward selection.Based on collected data of florescence period and flower number of 49 clones within a 13-year span in a seed orchard of Pinus tabulaeformis,the flowering synchronization of each clone in different investigated ages was estimated.Results showed that there were obvious differences of flowering synchronization among parent clone combinations.In general,flowering synchronization of clone as paternal was higher than it as maternal.Probability of selfing within clones were higher than out-crossing.There were moderate stability of flowering synchronization of clone as material among plant ages.So,clone selection by flowering synchronization of clone as material would be valuable in early flowering ages in seed orchard,but flowering synchronization of clone as paternal might be lower.Analysis of flowering synchronization of clones would be benefit for clone management in present seed orchard and refer to both genetic design and collocating design of parent for advanced seed orchard based on backward selection of clones.