The potential of hybrid potato for East-Africa

Vries, Michiel E. de; Maat, Menno ter; Lindhout, P.

doi:10.1515/opag-2016-0020

Cited by 48 publications

(28 citation statements)

References 6 publications

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“…The rapid development of diploid hybrid breeding is coupled with the prospects to cardinally shorten the duration of the breeding process and reduce the costs of producing and multiplying healthy clones (Lindhout et al, 2011(Lindhout et al, , 2018De Vries et al, 2016;Jansky et al, 2016), because most of potato pathogens are not transmitted with pollen or TPS. The onset of diploid hybrid breeding called for a need to study genetic bases of self-incompatibility (Phumichai et al, 2005) and inbreeding depression in potato (Zhang et al, 2019) in order to obtain inbred diploid lines, as well as to promote research on male sterility and CMS-Rf genetic systems, aimed at the development of effective interline hybridization techniques (Anisimova, Gavrilenko, 2017).…”

Section: Introductionmentioning

confidence: 99%

Cytoplasmic genetic diversity of potato varieties bred in Russia and FSU countries

et al. 2019

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Male sterility in potato is little studied since traditional breeding is based on the vegetative reproduction of highly heterozygous tetraploid varieties. The rapid development of hybrid diploid breeding contributes to growing interest in studying the male sterility of this important crop. In this work, a set of 6 cytoplasmic markers was employed to describe cytoplasmic genetic diversity of 185 potato cultivars bred in Russia and FSU countries. Three cytoplasm types were identified, T (40.0 %), D (50.8 %) and W/γ (8.7 %), which according to literature are associated with male sterility. With a single exception (0.5 %), cytoplasm types characteristic of male fertile forms (A, P) were not found in the subset of 185 cultivars. A comparison of these results with previously published data suggested expanding the subset to up to 277 cultivars, all developed in Russia or FSU countries; however, the resulting differentiation into three cytoplasm types (T, D and W/γ) was nearly the same. Fertility phenotyping helped identify both male-sterile and male-fertile genotypes within the three groups of varieties with T-, D-and W/γ-type cytoplasm. Fifteen genotypes differing in cytoplasm type and male sterility/fertility traits were selected for direct sequencing of 8 mtDNA loci. Fragments of the nad2, nad7, cox2, atp6 and CcmFc genes were identical in all 15 selected genotypes. The polymorphism, detected in the rps3, atp9 and CcmFc loci, was not associated with male sterility. Two SNPs in the nad1/ atp6 and nad2 loci differentiated 7 genotypes with W/γ-type cytoplasm into five genotypes with tetrad sterility, and two with fertile pollen. The results of an NGS analysis confirmed the association of these SNPs with tetrad sterility in a larger set of 28 genotypes of different origin, all with W/γ-type cytoplasm. A heteroplasmy state was observed both in male-sterile and in male-fertile genotypes.

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Section: Introductionmentioning

confidence: 99%

Cytoplasmic genetic diversity of potato varieties bred in Russia and FSU countries

et al. 2019

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“…For example, Solynta (a private company) has developed a true hybrid breeding system in diploid potato whereby homozygous parent lines are developed by several rounds of inbreeding and hybrid cultivars are generated by crossing these parent lines (Lindhout et al, 2011); the resulting true potato seeds were sown in seed boxes and later seedlings were transferred in the field. From their initial trial, the seedlings gave a maximum yield of 26 ton/ha and 29 ton/ha in Netherlands and DR Congo respectively (de Vries et al, 2016). However, these yields are far below the world average which stands at approximately 40 ton/ha (CSO, 2016); this is despite the intense care given to the delicate seedlings in this trial.…”

Section: Production Of Hybrid Potato Seedsmentioning

confidence: 87%

“…Previous studies have shown that seedling transplants produce lower tuber yields (ton/ha) and percentage of waresized tubers than a crop propagated from conventional tubers (Almekinders et al, 2009;Muthoni et al, 2014). The low yields reported in this trial could be due to three confounded factors: diploid versus tetraploid, experimental hybrid versus commercial cultivar and seedlings versus seed tubers (de Vries et al, 2016). Further tests with plants grown from convetional tubers and tetraploid experimental hybrids are needed to dissect these factors.…”

Section: Production Of Hybrid Potato Seedsmentioning

confidence: 92%

Production of hybrid potatoes: Are heterozygosity and ploidy levels important?

2019

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It has been proposed that maximizing heterosis for yield in potato may be achieved by maximizing heterozygosity and associated intra and interlocus interactions. Tetraploids offer more opportunities to create such interactions than diploids hence the general observations that tetraploids are higher yielding than diploids. Consequently, efforts have been made to increase heterozygosity in tetraploids by introgressing allelic diversity from other Solanum species into cultivated potato. However, conventional potato breeding is difficult because the cultivated potato is an autotetraploid with tetrasomic inheritance and it comprises highly heterozygous individuals which suffer inbreeding depression upon selfing; breeding at the tetraploid level is slow and less efficient than at diploid level. At the diploid level, it is possible to breed for and fix traits under recessive genetic control; it is nearly impossible to do so at the tetraploid level. There is also rapid response to selection due to greater variation in diploids than tetraploids. Consequently, there have been efforts to convert potato from an asexually propagated tetraploid crop into an inbred seed-propagated diploid; this is by production of inbred lines through selfing of the tetraploids to assemble desirable combinations of genes in the inbreds. These efforts are at the experimental stages and a lot of research needs to be done before they are confirmed. Because currently there is little experimental evidence to support superiority of the inbred seed-propagated diploid strategy, it appears the theory that heterosis for yield in potato may be achieved by maximizing heterozygosity and associated intra and interlocus interactions remain unchallenged; these interactions are more in tetraplods than in diploids. This paper therefore looks at genetic basis of yield heterosis in cultivated potato and the role of heterozygosity and ploidy level in production of hybrid potatoes.

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“…To obtain more homozygous, self-compatible diploid lines, Solynta ( www.solynta.com ) is setting up a mature breeding program with a selection of the best individuals in 750–1000 crossing diploid combinations every year and picking the best combinations to use as parents for selfings or crosses with other good parental lines. The first hybrid field trials have shown that diploid F1-hybrid breeding is making significant progress (De Vries et al 2016 ).…”

Section: Discussionmentioning

confidence: 99%

QTL mapping in diploid potato by using selfed progenies of the cross S. tuberosum × S. chacoense

Meijer

Víquez-Zamora²,

Eck

et al. 2018

Euphytica

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Usually, mapping studies in potato are performed with segregating populations from crosses between highly heterozygous diploid or tetraploid parents. These studies are hampered by a high level of genetic background noise due to the numerous segregating alleles, with a maximum of eight per locus. In the present study, we aimed to increase the mapping efficiency by using progenies from diploid inbred populations in which at most two alleles segregate. Selfed progenies were generated from a cross between S. tuberosum (D2; a highly heterozygous diploid) and S. chacoense (DS; a homozygous diploid clone) containing the self-incompatibility overcoming S locus inhibitor (Sli-gene). The Sli-gene enables self-pollination and the generation of selfed progenies. One F2 population was used to map several quality traits, such as tuber shape, flesh and skin color. Quantitative trait loci were identified for almost all traits under investigation. The identified loci partially coincided with known mapped loci and partially identified new loci. Nine F3 populations were used to validate the QTLs and monitor the overall increase in the homozygosity level.

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The potential of hybrid potato for East-Africa

Cited by 48 publications

References 6 publications

Cytoplasmic genetic diversity of potato varieties bred in Russia and FSU countries

Cytoplasmic genetic diversity of potato varieties bred in Russia and FSU countries

Production of hybrid potatoes: Are heterozygosity and ploidy levels important?

QTL mapping in diploid potato by using selfed progenies of the cross S. tuberosum × S. chacoense

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