Category: research

  • Do I have pedigree errors?

    Do I have pedigree errors?

    We just finished a genetic analysis, got breeding values for all our selection criteria, combined them with genetic parameters and economic weights in a selection index (I) that predicts the total genetic-economic value in dollars (H). We rank our trees from best to worst, perhaps with some constraint on relatedness, and go to the field…

  • All that glitters is not GxE interaction

    All that glitters is not GxE interaction

    We are going over the fifth version(*) of a manuscript with a Ph.D. student and colleagues, polishing some details before submission, thinking about one of the results: basically there is little, if any, Genotype by Environment (GxE) interaction. There is a long history of studying GxE interaction in radiata pine, with parallels in the development…

  • Early selection: how early is early enough? Part 4

    Early selection: how early is early enough? Part 4

    In the previous post we were able to screen trees for wood properties at 2 years of age, separating normal and compression wood by leaning the trees. We obtained genetic parameters, breeding values, etc. However, we also discovered that planting the trees directly in the ground was still subject to too much environmental variability. So,…

  • Early selection: how early is early enough? Part 3

    Early selection: how early is early enough? Part 3

    In my previous post we were able to detect extremes of wood density and stiffness with leaning trees at 8 months of age, vertically splitting the sample to separate normal and compression wood. This was doable, but the size of the wood samples was a tad small to screen large numbers of trees, so we…

  • Early selection: how early is early enough? Part 2

    Early selection: how early is early enough? Part 2

    In the previous post I mentioned that we wanted to screen trees for wood properties as early as possible, BUT there is a lot of “noise” with the mix of normal and reaction wood (compression in softwoods or tension in hardwoods). The main problems for running a glasshouse experiment were: So we got a glasshouse…