Genes Determining Rind Pattern Inheritance in Watermelon: A Review

نویسندگان

  • Gabriele Gusmini
  • Todd C. Wehner
چکیده

The inheritance of rind pattern and color in watermelon (Citrullus lanatus (Thunb.) Matsum. & Nakai) has been studied since the 1930s. The most common rind (or skin) colors in watermelon are solid green (dark, medium, and light), striped (narrow, medium, and wide dark green stripes on a light green background), and gray (a light green background with a medium or dark green network of reticulations). Gray is sometimes spelled grey, but the watermelon names have been standardized to the gray spelling. Gene expression for rind color and pattern does not appear to be consistent in all genetic backgrounds. Furthermore, the inheritance of gray or medium green rind colors has not been published, even though these have been two of the more common rind colors throughout the last century of watermelon breeding. The inheritance of rind pattern has been described from different perspectives in different publications and the gene names and symbols have been changed over time, thus generating confusion on the proper naming of genes and their trait descriptions. The original type lines used to describe some of these genes are not available any more. Thus, it is not possible to verify the inheritance of those genes, to improve the description of their phenotypes, or to identify alternative type lines through tests of allelism. Watermelon breeders and geneticists are often confused about the terminology describing basic rind colors and the proper description of some rind patterns that are less common, thus making it diffi cult to coordinate cooperative studies. This review was aimed at presenting the available information concerning the inheritance of rind color and pattern in watermelon, clarifying the description of uncommon phenotypes, and highlighting questions that remain unanswered.

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تاریخ انتشار 2005