Sweetpotato (Ipomoea batatas L.)

Mwanga, R.O.M.; Andrade, M.I.; Carey, Edward E.; Low, Jan; Yencho, G. Craig; Grüneberg, Wolfgang J.

doi:10.1007/978-3-319-59819-2_6

Cited by 42 publications

(29 citation statements)

References 143 publications

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“…True seed production occurs easily by open pollination, and a successful pollination results in one to four true seeds, so polycrosses have been the backbone of population improvement (Martin and Jones, 1986). For further details on breeding targets and an outline of seed systems in EA in linkage with new variety releases, refer to Mwanga et al (2017). In 2003, CIP and HarvestPlus (Pfeiffer and McClafferty, 2007) started an initiative to breed OFSP in SSA.…”

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confidence: 99%

“…The major traits of interest in EA are: (i) resistance to sweetpotato virus disease (SPVD, interaction of Sweetpotato chlorotic stunt virus and Sweetpotato feathery mottle virus; farmers usually propagate sweetpotato by cloning, without obtaining new seeds regularly), (ii) storage root yields and the number of commercial storage roots per plant, (iii) elevated pro-vitamin A with high root dry matter and starchy taste, (iv) abundant upper biomass production to facilitate vine production for seed systems and for use as animal feed, and (v) earliness and suitability for piecemeal harvest. For further details on breeding targets and an outline of seed systems in EA in linkage with new variety releases, refer to Mwanga et al (2017).…”

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Gene Pool Subdivision of East African Sweetpotato Parental Material

et al. 2018

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Sweetpotato [Ipomoea batatas (L.) Lam] breeding is important for food security and health in East Africa (EA), and a breeding platform in Uganda provides national researchers and breeders in EA with true seed. Our objectives were to characterize genetic relationships among parental material used at the EA breeding platform. There were 135 parents and six check clones analyzed using 31 simple sequence repeat primers. An average of 7.13 alleles per primer was found, and Jaccard similarity coefficients were in the range of 0.298 to 1.00 with a mean of 0.542. Unweighted pair group cluster analysis placed most African parents in two main subclusters showing no association with morphology or geographical origin. The subclusters were also supported by principal coordinate analysis, derivative analysis of principal components, and population structure simulations. The analyzed breeding material from EA was highly genetically variable, grouped in two distinct genetic pools, and suitable to study heterosis exploiting breeding schemes.

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Gene Pool Subdivision of East African Sweetpotato Parental Material

et al. 2018

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“…In other major crops such as maize (Matin et al, 2017) and cotton (Khokhar et al, 2013), combining ability and heterosis have been heavily studied. Genetic studies in sweet potato are limited due to several barriers, namely: it is self and cross-incompatibility, high level of polyploidy and limited flowering ability and seed setting (Mwanga et al, 2017). Keeping in view the economic importance of yield contributing traits (storage root weight, vine weight) in sweet potato and also the importance of flesh color as well as resistance to SPVD, the objectives of the present study were: (1) to evaluate the general combining ability effects (GCA) of parents, (2) to estimate the specific combining ability (SCA) effects of different cross combinations with regard to the aforementioned traits, (3) to calculate the extent of the mid-parent heterosis for all progenies, and (4) to infer the correlations between the measured traits.…”

Section: Introductionmentioning

confidence: 99%

Heterosis and combining ability for storage root, flesh color, virus disease resistance and vine weight in Sweet potato [Ipomoea batatas (L.) Lam.]

Bâ¹,

Gemenet²,

Onguso³

et al. 2020

Afr. J. Agric. Res.

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This study was done to determine the mid-parent heterosis, the general (GCA) and specific (SCA) combining abilities of storage root yield, sweet potato virus resistance (SPVD), flesh color and vine weight of candidate sweet potato clones. Sixteen selected genotypes from two gene pools were crossed in an 8B×8A cross having 64 families. Trials were conducted with 1,896 offsprings and 16 parents during two seasons at the National Crops Resources Research Institute in Uganda (NaCRRI) using a Westcott design (only checks were replicated). Significant differences in performance were noted among families for all traits in both seasons (P ≤ 0.001). Magabali×NK259L and Resisto×Naspot 7 were the best crosses for improving total storage root while Naspot 5×Naspot 7 stood out as the best cross for flesh color. The ratio of general combining ability to specific combining ability (GCA/SCA) for storage root, flesh color and SPVD ranged from 0.55 to 0.79, implying that additive gene effects were more important than non-additive gene effects for these traits. For vine weight, non-additive gene effects tended to be predominant. A susceptible parent Magabali and a moderately susceptible parent Naspot 1 had the most resistant progenies. This suggests that SPVD resistant alleles could be homozygous recessive, which may be confirmed in further studies. Correlation studies between traits were almost all significant except for flesh color and storage root yield. There was a positive and significant correlation (P ≤ 0.001) between flesh color and SPVD resistance, with orange roots being the most resistant to SPVD. This important finding can help breeders to come up with orange-fleshed sweet potatoes that are highly resistant to virus diseases.

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“…Sweetpotato trait improvement through conventional breeding is constrained by its laborious and time-consuming genetics. These limitations principally arise owing to the crop’s high heterozygosity, high levels of male infertility, complicated polyploidy and production of few seeds because of its self-incompatibility, resulting to sturdy segregation of hybrid progenies and the loss of numerous valuable traits (Martin 1965, Mwanga et al 2017). The fast advancement in plant biotechnology has unlocked new potentials for increasing tolerance to abiotic and biotic stresses to sweetpotato as well as improving its nutritional quality by identifying key genes and introducing them through genetic engineering Additionally, genetic engineering technology has the capability of introgressing genes from incompatible plant species or other organisms, an imperative phenomenon for crop improvement.…”

Section: Introductionmentioning

confidence: 99%

Induced expression of Xerophyta viscosa XvSap1 gene greatly impacts tolerance to drought stress in transgenic sweetpotato

Mbinda

Dixelius

Oduor

2019

Preprint

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Key message Drought stress in sweetpotato could be overcome by introducing XvSap1 gene from Xerophyta viscosa.Drought stress often leads to reduced yields and is perilous delimiter for expanded cultivation and increased productivity of sweetpotato. Cell wall stabilization proteins have been identified to play a pivotal role in mechanical stabilization during desiccation stress mitigation. They are involved in myriad cellular processes that modify the cell wall properties to tolerate the mechanical stress during dehydration in plants. This provides a possible approach to engineer crops for enhanced stable yields under adverse climatic conditions. In this study, we introduced the XvSap1 gene isolated from Xerophyta viscosa, a resurrection plant into sweetpotato by Agrobacterium-mediated transformation. Detection of the transgene by PCR coupled with Southern blot revealed the integration of XvSap1 in the three independent events. Sweetpotato plants expressing the XvSap1 gene exhibited superior growth performance such as shoot length, number of leaves and yield than the wild type plants under drought stress. Quantitative real time-PCR results confirmed higher expression of the XvSap1 gene in XSP1 transgenic plants imposed with drought stress. In addition, the transgenic plants had increased levels of chlorophyll, free proline and relative water content but malonaldehyde content was decreased under drought stress compared to wild type plants. Conjointly, our findings show that XvSap1 can enhance drought resilience without causing deleterious phenotypic and yield changes, thus providing a promising candidate target for improving the drought tolerance of sweetpotato cultivars through genetic engineering. The transgenic drought tolerant sweetpotato line provides a valuable resource as drought tolerant crop on arid lands of the world.

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Sweetpotato (Ipomoea batatas L.)

Cited by 42 publications

References 143 publications

Gene Pool Subdivision of East African Sweetpotato Parental Material

Gene Pool Subdivision of East African Sweetpotato Parental Material

Heterosis and combining ability for storage root, flesh color, virus disease resistance and vine weight in Sweet potato [Ipomoea batatas (L.) Lam.]

Induced expression of Xerophyta viscosa XvSap1 gene greatly impacts tolerance to drought stress in transgenic sweetpotato

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