Summary
A random sample of 59 F7 lines were produced by single seed descent from a cross between V2 and VI2 of Nicotiana rustica. They have been compared in eight environments with F7 lines selected from the same cross for all four combinations of high (H) and low (L) mean performance and high (h) and low (l) environmental sensitivity in a pair of these environments. The characters considered were flowering time and final height and the environments were provided by four sowing dates at each of two planting densities. Both in the pair of environments in which the selections were made and in the other six environments, there were among the random F7s many which met the four selection criteria (Hh, Hl, Lh, and Ll) better than the selected F7s. While among the selected F7s there was no satisfactory Lh selection for flowering time or Hl selection for final height, there were as many lines among the random F7s which met these selection criteria as met the other three selection criteria for each character. Inefficiency in the selection procedures traceable to seasonal differences, rather than shortage of the appropriate segregants, was the primary cause of the unsatisfactory selections. Lines with the Lh phenotype for flowering time and Hh for final height, which are the phenotypes produced by the dominant genes, maintained their mean performance and environmental sensitivity over all sets of environments better than any of the other combinations of performance and sensitivity.
These results demonstrate the superiority of single seed descent over conventional family selection and confirm that mean performance and environmental sensitivity are largely under the control of different gene loci.
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Jinks, J., Jayasekara, N. & Boughey, H. Joint selection for both extremes of mean performance and of sensitivity to a macroenvironmental variable. Heredity 39, 345–355 (1977). https://doi.org/10.1038/hdy.1977.75
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DOI: https://doi.org/10.1038/hdy.1977.75
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