Field Evaluation of Elite Sweet Potato (Ipomoea batatas (L.) Lam) Varieties in Humid Rainforest of Calabar, Nigeria

Effiong, Uko Aniefiok; Bassey, Effa Emmanuel; Aniezi, Nwagwu Francis

doi:10.3923/ajbs.2019.779.785

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…However, only number of tubers and individual tuber weight that could be used as an selection indicator of yield as indicated by positive and very high correlation, and very significant effect (Table 4), which was also supported by moderate to high heritability and high GAM. Bassey, Effiong, & Aniezi (2019) found that number of tubers, tuber diameter and individual tuber weight correlated with fresh tuber yield, so that the improvement of these three sweet potato characters would simultaneously improved tuber yield. There were sweet potato characters that are positively, highly and significantly correlated with total tuber yield (Yahaya, Saad, Mohammed, & Afuape, 2015), and therefore, improvement of one character might directly lead to an improvement of total tuber yield.…”

Section: Discussionmentioning

confidence: 97%

“…Number of primary branches positively, significantly and very significantly correlated with tuber diameter and tuber yield. Bassey, Effiong, & Aniezi (2019) found that number of branches was positively correlated with tuber diameter but it did not correlate with tuber yield. A vegetative character may not be an unimportant character but can be an indicator of selection for yield components and yield if both have a high and significant correlation coefficient.…”

Section: Correlation Between Characters In Sweet Potatoes Under Water Stressmentioning

confidence: 92%

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Selection Indicators of Yield Components and Yield for Improvement of Local Sweet Potato under Water Stress

et al. 2021

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Genetic diversity is required for crop improvement against environmental stress. Astudy wasconducted to determine characters as selection indicators of water-stress tolerance, and of yield components and yield. The research method involved a one-factor experiment with 21 sweet potato clones, using a Completely Randomized Block design with three replicates. Water stress in this study mean that the bottom of plants was submerged in water at 2 and 3 months of age. Determination of selection indicators was conducted by estimating the coefficients of genetic and phenotypic variations, heritabilities, genetic advance and correlation test result. The characters of number of leaves, individual leaf area, leaf area per plant, leaf area index, stem length, internode length, number of tubers (storage root), individual tuber weight and yieldas selection indicators of water stress tolerance. Selection indicators of yield components consisted of less number of leaves, small leaf size, short stemsand number of branches, whereas selection indicators of yield were small leaf size, number of branches, number of tubers and individual tuber weight. Selection became effective and efficient when the selection indicators were influenced greatly by genetic factors.

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Section: Discussionmentioning

confidence: 97%

Section: Correlation Between Characters In Sweet Potatoes Under Water Stressmentioning

confidence: 92%

Selection Indicators of Yield Components and Yield for Improvement of Local Sweet Potato under Water Stress

et al. 2021

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“…Dipping plant material into a synthetic pesticide before planting, can delay pest infestation for several months [27]. Insecticides are expensive and at times inaccessible to growers in SSA making their use impractical and unsustainable [35] Biological…”

Section: Cultural Practicesmentioning

confidence: 99%

Breeding for Resistance to the African Sweetpotato Weevils, Cylas puncticollis and Cylas brunneus in Uganda: A Review of the Current Progress

Yada,

Musana,

Chelangat

et al. 2023

Preprint

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In sub-Saharan Africa, sweetpotato weevils are the most devastating pests of cultivated sweetpotato, causing estimated losses of between 60% and 100%, primarily during dry spells. The predominantly cryptic feeding behavior of the Cylas spp within the roots makes their control difficult, thus host plant resistance is one of the most promising lines of protection against these pests. However, progress in breeding for weevil-resistant cultivars has been slow in part due to the complex hexaploid genome of sweetpotato, which complicates conventional breeding in addition to the scarcity of varieties with significant levels of resistance for use as sources of resistance. Pollen sterility, cross incompatibility and poor seed set and germination in sweetpotato are also common challenges to improving weevil resistance. Accurate phenotyping of sweetpotato weevil resistance to enhance efficiency of selection has been equally difficult. Genomics-assisted breeding though in its infancy stages in sweetpotato has the potential application in overcoming some of these barriers. However, it will require the development of more genomic infrastructure; particularly single nucleotide polymorphism markers (SNPs), robust next generation sequencing plat-forms together with relevant statistical procedures for analyses. With the recent advances in genomics, we anticipate that genomic breeding for sweetpotato weevil resistance will be expedited in the coming years. This review sheds light on Uganda's efforts to date to breed against the Cylas puncticollis (Boheman) and Cylas brunneus (Fabricius) species of African sweetpotato weevil.

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“…Dipping plant material into a synthetic pesticide prior to planting can delay pest invasion for a number of months [25]. Insecticides are expensive and at times inaccessible to growers in SSA, making their use impractical and unsustainable [33].…”

Section: Chemical Practicesmentioning

confidence: 99%

Breeding Cultivars for Resistance to the African Sweetpotato Weevils, Cylas puncticollis and Cylas brunneus, in Uganda: A Review of the Current Progress

Yada,

Musana,

Chelangat

et al. 2023

Insects

View full text Add to dashboard Cite

In sub-Saharan Africa, sweetpotato weevils are the major pests of cultivated sweetpotato, causing estimated losses of between 60% and 100%, primarily during dry spells. The predominantly cryptic feeding behavior of Cylas spp. within their roots makes their control difficult, thus, host plant resistance is one of the most promising lines of protection against these pests. However, limited progress has been made in cultivar breeding for weevil resistance, partly due to the complex hexaploid genome of sweetpotato, which complicates conventional breeding, in addition to the limited number of genotypes with significant levels of resistance for use as sources of resistance. Pollen sterility, cross incompatibility, and poor seed set and germination in sweetpotato are also common challenges in improving weevil resistance. The accurate phenotyping of sweetpotato weevil resistance to enhance the efficiency of selection has been equally difficult. Genomics-assisted breeding, though in its infancy stages in sweetpotato, has a potential application in overcoming some of these barriers. However, it will require the development of more genomic infrastructure, particularly single-nucleotide polymorphism markers (SNPs) and robust next-generation sequencing platforms, together with relevant statistical procedures for analyses. With the recent advances in genomics, we anticipate that genomic breeding for sweetpotato weevil resistance will be expedited in the coming years. This review sheds light on Uganda’s efforts, to date, to breed against the Cylas puncticollis (Boheman) and Cylas brunneus (Fabricius) species of African sweetpotato weevil.

show abstract

Field Evaluation of Elite Sweet Potato (Ipomoea batatas (L.) Lam) Varieties in Humid Rainforest of Calabar, Nigeria

Cited by 5 publications

References 4 publications

Selection Indicators of Yield Components and Yield for Improvement of Local Sweet Potato under Water Stress

Selection Indicators of Yield Components and Yield for Improvement of Local Sweet Potato under Water Stress

Breeding for Resistance to the African Sweetpotato Weevils, Cylas puncticollis and Cylas brunneus in Uganda: A Review of the Current Progress

Breeding Cultivars for Resistance to the African Sweetpotato Weevils, Cylas puncticollis and Cylas brunneus, in Uganda: A Review of the Current Progress

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