Monday, 7 November 2005 - 8:30 AM
47-3

Breaking Mendel’S Rules in White Lupin.

Steven Noffsinger and Edzard Van Santen. Auburn University, Agronomy & Soils Dept., 202 Funchess Hall, Auburn, AL 36849-5412

Many have presumed that inheritance in white lupin (Lupinus albus L.) follows the simple single gene inheritance patterns studied by Mendel. Our population of recombinant inbred lines (RIL) in white lupin has followed other patterns of inheritance for several agronomic traits. The original cross was Tifwhite-78 (high alkaloid, indeterminate) x Lucyanne (low alkaloid, determinate). Studies were 200 F2:7 in 2003 and 200 F8 recombinant inbred lines in 2004 at central, AL, USA. Segregating lines for development and yield traits were sown plant to plot in 2004. The alkaloid segregating RIL 1082 (2003 designation) was planted in the greenhouse and crossed for future study of the pauper locus; this line also had light blue flower color indicating a chromosome crossover event. This line and RIL 1071 were both spring types indicating spring vs. winter type growth habit may be controlled by several genes. Several lines segregated for growth habit and plant height in the F2:7 and F8. RIL 410 was labeled “the contortionist” as each individual plant would choose which inflorescence level to place a severely determinate branch. Late flowering leafy lines with greater than 60 leaves on the mainstem still segregated for lower and higher mainstem leaf number in the F2:7 and F8. Some of this material will eventually be sent to the USDA-ARS-WRPIS collection in Pullman, WA, USA.

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