Cytoplasmic substitution inSolanum. II. Tuber characteristics of reciprocal backcross progeny |
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Authors: | Victor Amoah Paul Grun R. R. Hill Jr. |
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Affiliation: | (1) Department of Horticulture and Biology, The Pennsylvania State University, 16802 University Park, PA, USA;(2) U.S. Department of Agriculture Pasture Research Laboratory, 16802 University Park, PA, USA;(3) Present address: Escagen Corp., 830 Bransten Road, 94070 San Carlos, CA, USA |
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Abstract: | Summary Recurrent backcrosses (BC) were used to introduce nuclear factors ofS. tuberosum L. ssp.tuberosum into the cytoplasm of Andean potatoesS. tuberosum ssp.andigena (Juz. and Buk.) Hawkes andS. phureja Juz. and Buk. Each generation BC was produced in reciprocal directions to test the effect of cytoplasmic substitution on yield. This report analyses tuber number, tuber weight, and tuber length of BC2 and BC3 substitution into ssp.andigena cytoplasm and BC2 and BC2 substitutions intoS. phureja cytoplasm. Direction of cross had no consistent significant effect on yield components of ssp.andigena substitution lines. InS. phureja reciprocal progenies direction of cross was responsible for significant differences of some reciprocal sets. When there were significant differences the higher yield usually occurred when ssp.tuberosum was the pistillate parent, but in some progenies when ssp.tuberosum was the pistillate parent the yield was significantly lower than in the reciprocals. It is suggested that differences between reciprocals resulted from chromosomally encoded gene action, resulting from maternal and/or paternal effects, rather than cytoplasmic factors. Authorized for publication as paper No. 7494 in the Journal Series of The Pennsylvania Agriculture Experiment Station. |
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Keywords: | reciprocals backcrosses maternal effect andigena phureja chacoense |
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