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This article in CS

  1. Vol. 51 No. 4, p. 1784-1792
     
    Received: Feb 15, 2011


    * Corresponding author(s): j-lamantia@tamu.edu
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doi:10.2135/cropsci2010.10.0580

Instability of the Greens-Type Phenotype in Poa annua L.

  1. Jonathan M. La Mantia *ab and
  2. David R. Huffb
  1. a Dep. of Crop and Soil Science, Pennsylvania State Univ., 116 ASI Building, University Park, PA 16802
    b current address. Texas AgriLife Research Center, Texas A&M University System, 17360 Coit Road Dallas, TX 75252. This work was funded in part by the United States Golf Association

Abstract

The turfgrass species Poa annua L. is most prevalent as an invasive, annual weed in managed turfs. Conversely, the dwarf perennial greens-type biotype produces a high turf quality with great utility to the golf-course industry. In the past 60 yr, several attempts have been made to breed a commercial cultivar of the greens-type biotype with little sustained success. Here, we characterize the morphological traits of the greens-type phenotype and investigate its inheritance and stability through genetic crosses. The results indicate that the greens-type phenotype links single-branching inflorescences with reductions in culm length, tiller length, leaf length, and panicle length to a single genetic mechanism. However, in advanced-generation progeny, the segregation of the greens-type phenotype does not conform to the disomic single-gene inheritance model. Tetrasomic inheritance, gene complementation, and quantitative inheritance models are also presented. These results, along with the observation of somatic reversions, suggest that the greens-type phenotype is unstable and may be regulated by an epigenetic mechanism.

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Copyright © 2011. Copyright © by the Crop Science Society of America, Inc.