Breeding vegetatively propagated horticultural crops

Bisognin, Dílson Antônio

doi:10.1590/s1984-70332011000500006

Cited by 36 publications

(17 citation statements)

References 23 publications

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“…Apios is clonally propagated through tubers similar to many tuber crops, such as potato, cassava, sweet potato, and yams. Tuber crops are often highly heterozygous and exhibit hybrid vigor 34 . An advantage of clonal propagation is that once a superior hybrid is identified, it can be fixed and propagated in the heterotic state.…”

Section: Discussionmentioning

confidence: 99%

Genomics-assisted characterization of a breeding collection of Apios americana, an edible tuberous legume

Belamkar

Farmer

Weeks

et al. 2016

Sci Rep

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For species with potential as new crops, rapid improvement may be facilitated by new genomic methods. Apios (Apios americana Medik.), once a staple food source of Native American Indians, produces protein-rich tubers, tolerates a wide range of soils, and symbiotically fixes nitrogen. We report the first high-quality de novo transcriptome assembly, an expression atlas, and a set of 58,154 SNP and 39,609 gene expression markers (GEMs) for characterization of a breeding collection. Both SNPs and GEMs identify six genotypic clusters in the collection. Transcripts mapped to the Phaseolus vulgaris genome–another phaseoloid legume with the same chromosome number–provide provisional genetic locations for 46,852 SNPs. Linkage disequilibrium decays within 10 kb (based on the provisional genetic locations), consistent with outcrossing reproduction. SNPs and GEMs identify more than 21 marker-trait associations for at least 11 traits. This study demonstrates a holistic approach for mining plant collections to accelerate crop improvement.

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Section: Discussionmentioning

confidence: 99%

Genomics-assisted characterization of a breeding collection of Apios americana, an edible tuberous legume

Belamkar

Farmer

Weeks

et al. 2016

Sci Rep

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“…The advantages of genetic improvement strategies in the development of new cultivars and the maximization of plantlet production have been discussed for the main vegetable and tree species for which vegetative propagation is used (Assis & Resende, 2011;Bisognin, 2011). Forest improvement has been concentrated on exotic species, mainly on the genera Eucalyptus, Pinus, Acacia and Tectona.…”

Section: Introductionmentioning

confidence: 99%

Early selection of Cabralea canjerana for propagation by mini-cutting

Burin

Bisognin

Lencina

et al. 2018

Pesq. agropec. bras.

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The objective of this work was to define an early selection strategy to identify Cabralea canjerana (Meliaceae) clones with high multiplication rate. A mini-garden of 109 clones of canjerana seedlings was established in a completely randomized design, in an acclimatized greenhouse. From seedlings, the mini-stumps and mini-cuttings were obtained. Mini-cuttings were collected at five different times, and the number of mini-cuttings per mini-stump, rooting percentage, and number of rooted mini-cuttings were quantified. The number of rooted mini-cuttings per mini-stump was the only trait that showed high correlation with the others. Five groups of clones based on the number of rooted mini-cuttings per mini-stump were separated using k-means clustering, and the genetic gain from selection and Pearson correlation were estimated. The selection of the two best groups in each evaluation period resulted in high genetic gains from selection for all evaluated traits. Early selection for the number of rooted mini-cuttings discarded 65% of the evaluated clones, which increases experimental precision in evaluations of traits associated with plantlet growth and quality. Early selection for the number of rooted mini-cuttings per mini-stump at different times allows the identification of Cabralea canjerana clones with high multiplication rate.

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“…61Many major food crops, including nearly all types of fruit and all important 62 roots and tubers, are clonally propagated (Grüneberg et al, 2009;Bradshaw, 2016). In 63 clonal breeding programs, new genotypes are created by sexual reproduction and 64 multiplied through clonal propagation (Bisognin, 2011;Gemenet and Khan, 2017). The 65 new genotypes are first tested as seedlings in unreplicated trials during the initial phase 66 of the breeding program.…”

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confidence: 99%

Genomic selection strategies for clonally propagated crops

Sargent

et al. 2020

Preprint

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Key message: For genomic selection in clonal breeding programs to be 14 effective, crossing parents should be selected based on genomic predicted cross 15 performance unless dominance is negligible. Genomic prediction of cross performance 16 enables a balanced exploitation of the additive and dominance value simultaneously. A 17 two-part breeding program with parent selection based on genomic predicted cross 18 performance to rapidly drive population improvement has great potential to improve 19 breeding clonally propagated crops. 20 Abstract 21For genomic selection in clonal breeding programs to be effective, crossing 22 parents should be selected based on genomic predicted cross performance unless 23 dominance is negligible. Genomic prediction of cross performance enables a balanced 24 exploitation of the additive and dominance value simultaneously. Here, we compared 25 different strategies for the implementation of genomic selection in clonal plant breeding 26 programs. We used stochastic simulations to evaluate six combinations of three 27 breeding programs and two parent selection methods. The three breeding programs 28 included i) a breeding program that introduced genomic selection in the first clonal 29 testing stage, and ii) two variations of a two-part breeding program with one and three 30 crossing cycles per year, respectively. The two parent selection methods were i) 31 selection of parents based on genomic estimated breeding values, and ii) selection of 32 parents based on genomic predicted cross performance. Selection of parents based on 33 genomic predicted cross performance produced faster genetic gain than selection of 34 parents based on genomic estimated breeding values because it substantially reduced 35 inbreeding when the dominance degree increased. The two-part breeding programs 36 with one and three crossing cycles per year using genomic prediction of cross 37 performance always produced the most genetic gain unless dominance was negligible. 38We conclude that i) in clonal breeding programs with genomic selection, parents should 39 be selected based on genomic predicted cross performance, and ii) a two-part breeding 40 program with parent selection based on genomic predicted cross performance to rapidly 41 drive population improvement has great potential to improve breeding clonally 42 propagated crops. 43 additive genetic effects in a given breeding population. As a result, heterozygosity is 55 reduced. Although selection for the genomic estimated breeding value will increase the 56 additive value over time, it may lead to a reduction of the dominance value, unless 57 dominance is negligible. In the long term, using the genomic estimated breeding value 58 to select new parents in breeding programs which deliver outbred varieties, such as in 59 clonal plant breeding programs, might not be the optimal method to use in order to 60 maximize the total genetic value of the breeding population in a sustainable fashion. 61Many major food crops, including nearly all types of fruit and all importa...

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Breeding vegetatively propagated horticultural crops

Cited by 36 publications

References 23 publications

Genomics-assisted characterization of a breeding collection of Apios americana, an edible tuberous legume

Genomics-assisted characterization of a breeding collection of Apios americana, an edible tuberous legume

Early selection of Cabralea canjerana for propagation by mini-cutting

Genomic selection strategies for clonally propagated crops

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