Ploidy manipulation of the gametophyte, endosperm and sporophyte in nature and for crop improvement: a tribute to Professor Stanley J. Peloquin (1921–2008)

Ortíz, Rodomiro; Simon, Philipp W.; Jansky, Shelley; Stelly, David M.

doi:10.1093/aob/mcp207

Cited by 52 publications

(18 citation statements)

References 127 publications

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“…This confirmed empirical observations that some genotypes with the D-type cytoplasm can function as pollen parents (Hosaka and Sanetomo 2012). A higher frequency of male-fertile lines will contribute as well to germplasm enhancement, facilitating the incorporation of desirable traits from 2x germplasm to 4x populations (Ortiz et al 2009). …”

Section: Discussionsupporting

confidence: 82%

Cytoplasmic diversity in potato breeding: case study from the International Potato Center

et al. 2015

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We analyzed the cytoplasmic diversity of CIP potato breeding germplasm. Cytoplasm types were assigned to 978 genotypes consisting of 265 foreign accessions used as input germplasm, 642 breeding lines developed by CIP, and 71 varieties released from CIP material. We found T (45 %), D (38 %), and W (11 %) to be the most frequent cytoplasm types in CIP breeding germplasm. Comparing the initial input germplasm to CIP breeding lines, the frequency of T-type cytoplasm decreased from 64 to 38 %, while those of D-and W-type cytoplasms increased from 26 to 41 % and from 6 to 14 %, respectively. We conclude that the CIP breeding program, as many others worldwide, has experienced a genetic bottleneck in terms of cytoplasmic diversity due to the unintended and continuous use of cytoplasmic-based male-sterile maternal lineages derived from Solanum demissum and S. stoloniferum in parental line and variety development. Nonetheless, the finding of male-fertile T-type breeding lines must have alleviated the problem to a certain extent, thus enabling CIP breeding progress.

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Section: Discussionsupporting

confidence: 82%

Cytoplasmic diversity in potato breeding: case study from the International Potato Center

et al. 2015

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“…Diploid derivatives of S. tuberosum are sexually compatible with S. chacoense (Hermundstad and Peloquin, 1986). Sexual polyploidization can then be used to return to the tetraploid level (Ortiz et al, 2009). In fact, S. chacoense is credited with making major contributions to processing quality in modern tetraploid potato cultivars (Love et al, 1998).…”

mentioning

confidence: 99%

Quantitative Trait Loci for Resistance to Common Scab and Cold‐Induced Sweetening in Diploid Potato

et al. 2017

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The development of germplasm with resistance to common scab and cold-induced sweetening is a high priority for the potato (Solanum tuberosum L.) industry. A mapping population was developed from mating two individuals of a diploid family generated by crossing the susceptible cultivated potato clone US-W4 to the highly resistant wild relative (Solanum chacoense Bitter) clone '524-8'. Progeny were evaluated in replicated field trials. Tubers were scored for percentage of surface area with scab lesions, scab lesion type, cold-induced sweetening, average tuber weight, and dry matter. Plants were evaluated for vine maturity. A genetic map was constructed, quantitative trait loci (QTLs) were identified, and the gene action of significant QTLs was characterized using 1606 single nucleotide polymorphisms (SNPs). Significant QTLs for common scab percentage of surface area covered with lesions and lesion type were identified in overlapping regions on chromosome 11 (R 2 = 21.0 and 18.2%, respectively). Quantitative trait loci were identified on chromosomes 4 (R 2 = 17.1%) and 6 (R 2 = 19.4%) for cold-induced sweetening, chromosome 5 for maturity (R 2 = 29.8%), and chromosome 1 (R 2 = 26.3 and 22.0%) for average tuber weight. Identification of QTLs is the first step toward developing molecular markers for breeders to efficiently integrate these desirable traits into cultivars.

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“…Some breeding programs maintain a diploid gene pool, often composed of hybrids between dihaploids and diploid wild species carrying specific quality and disease resistance genes not found in cultivars. The number of these lines is small, however, and they have been developed with the intention of introgressing those traits into tetraploid potato via 2 n gametes (Carputo and Barone, 2005; Ortiz et al, 2009). Selection for the broad range of traits required in a new cultivar has not been a priority in these breeding programs.…”

Section: What Questions Must We Answer As We Develop This New System?mentioning

confidence: 99%

Reinventing Potato as a Diploid Inbred Line–Based Crop

et al. 2016

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The third most important food crop worldwide, potato (Solanum tuberosum L.) is a tetraploid outcrossing species propagated from tubers. Breeders have long been challenged by polyploidy, heterozygosity, and asexual reproduction. It has been assumed that tetraploidy is essential for high yield, that the creation of inbred potato is not feasible, and that propagation by seed tubers is ideal. In this paper, we question those assumptions and propose to convert potato into a diploid inbred line-based crop propagated by true seed. Although a conversion of this magnitude is unprecedented, the possible genetic gains from a breeding system based on inbred lines and the seed production benefits from a sexual propagation system are too large to ignore. We call on leaders of public and private organizations to come together to explore the feasibility of this radical and exciting new strategy in potato breeding.

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Ploidy manipulation of the gametophyte, endosperm and sporophyte in nature and for crop improvement: a tribute to Professor Stanley J. Peloquin (1921–2008)

Cited by 52 publications

References 127 publications

Cytoplasmic diversity in potato breeding: case study from the International Potato Center

Cytoplasmic diversity in potato breeding: case study from the International Potato Center

Quantitative Trait Loci for Resistance to Common Scab and Cold‐Induced Sweetening in Diploid Potato

Reinventing Potato as a Diploid Inbred Line–Based Crop

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