Summary
The frequency of haploid production following the interspecific pollination of eight tetraploid potato cultivars (Solanum tuberosum subsp. tuberosum) with Solanum phureja clone 1.22 was investigated. A total of 185 haploids were produced with an overall haploid frequency of 3.9 haploids/100 fruits. The haploid frequency was affected by the genotype of the maternal parent. Atlantic, ND860-2, Superior, Saginaw Gold, Spartan Pearl, Nooksack and Onaway had frequencies of 6.2, 5.1, 4.7, 3.9, 2.3 and 0.7 haploids/100 fruits, respectively. There were 60 and 57 haploids produced from Atlantic and Saginaw Gold, respectively, and no haploids were extracted from fruits of Lemhi Russet. Isozyme analysis and visual examination were performed independently to compare the efficiency of discriminating hybrids from haploids. Approximately 80% of total hybrids could be identified by electrophoretic analysis, while 77% were distinguished through visual examination. Pgm-2 1, which is unique in the clone 1.22 and absent from all seed parents, was found to be the most useful locus in hybrid identification and 50% of total hybrids could be distinguished by this allele. With similar rationale, Mdh-1 1 allozyme, which was absent in six of the eight parents, identified 37% of total hybrids. A combination of both visual and electrophoretic methods made hybrid identification even more efficient, with an average identification efficiency of 91%. A scheme was proposed to develop a new haploid inducer which would be homozygous for both Pgm-2 1 and embryo spot.
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Liu, CA., Douches, D.S. Production of haploids of potato (Solanum tuberosum subsp. tuberosum) and their identification with electrophoretic analysis. Euphytica 70, 113–126 (1993). https://doi.org/10.1007/BF00029648
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DOI: https://doi.org/10.1007/BF00029648