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Rhizomatous Lotus corniculatus: IV. Inheritance of Rhizomes

Faculty of Natural Sciences, Prince of Songkhla Univ., Hatyai, Songkhla (90112), Thailand (formerly Dep. of Agronomy, University of Missouri, Columbia, MO 65211)
USDA-ARS, Plant Genetics Res. Unit, Columbia, MO 65211

^* Corresponding author (pbeuselinck{at}psu.missouri.edu).

Rhizome production has been transferred from wild germplasm of Lotus corniculatus L. (broadleafed birdsfoot trefoil) into domesticated cultivars and autogamous germplasm. The objective of this study was to determine the inheritance of rhizomes in L. corniculatus. Crosses were made between AG-S4, an autogamous, nonrhizomatous germplasm and two rhizomatous accessions from Morocco, G31276 and G31317. Two autogamous progeny from each cross (verified as F₁ hybrids by morphological, meiotic, and RAPD markers) produced F₂ seed and were reciprocally backcrossed (BC). After 40 wk growth in the greenhouse, F₂ and BC progeny were scored for rhizome production. Plants failing to express rhizomes in the greenhouse were transplanted to the field at Columbia, MO, and reevaluated for presence or absence of rhizomes at the end of the growing season. Segregation ratios for rhizome expression were tested for goodness-of-fit by the Chi-square (x²) test. The ratios of rhizome production in F₂ and BCs to AG-S4 fit 3:1 and 1:1 rhizomatous:nonrhizomatous ratios, indicating that rhizome presence in L. corniculatus germplasm G31276 and G31317 is controlled by a single dominant gene. The gene symbol R is proposed for rhizome expression.

Received for publication September 8, 1997.

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