Karyotypic Relationships among Some Rosa Species

in HortScience
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  • 1 1Dept. of Horticultural Sciences, Texas A&M Univ., College Station, TX 77843-2133.
  • | 2 2Dept. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843-2133.

Mitotic chromosome numbers and measurements were determined from enzymatically digested shoot tips for 14 species of Rosa, subgenus Hulthemia, Platyrhodon, and Rosa (the latter represented by sections Pimpinellifoliae, Cinnamoneae, Synstylae, Banksianae, Laevigatae, and Bracteatae). All were 2n = 14 or 2n = 28, as expected from previously published chromosome counts in Rosa. Arm lengths of chromosome pairs measured from digitized images were analyzed for similarity using a least-squares algorithm. On this basis, tetraploid species were compared to their diploid relatives. This study demonstrates the value of karyotypic data in combination with morphological and ecological information for examining the evolution of Rosa.

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