Identification of the key morphological sweetpotato weevil resistance predictors in Ugandan sweetpotato genotypes using correlation and path‐coefficient analysis

Osaru, Florence; Karungi, J.; Odama, Roy; Chelangat, Doreen M.; Musana, Paul; Otema, Milton A.; Oloka, Bonny; Gibson, Paul; Edema, Richard; Ssali, Reuben; Yencho, G. Craig; Yada, Benard

doi:10.1002/csc2.20915

Cited by 3 publications

(3 citation statements)

References 44 publications

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“…In the past, sweetpotato morphological traits such as vine vigor, ground cover, foliage weight, storage root stalk (neck length), storage root cortex thickness, storage root size, storage root shape, storage root formation (arrangement), root latex production, and dry matter content were reported to play an important role in conferring field resistance to SPW [41]. But through correlation and path coefficient analysis, neck length was identified as the key morphological SPW resistance predictor [50]. This trait will be useful in selecting for SPW resistance among breeding clones during early stages of breeding.…”

Section: Progress In Breeding For Resistance To Cylas Sppmentioning

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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Section: Progress In Breeding For Resistance To Cylas Sppmentioning

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

View full text Add to dashboard Cite

show abstract

“…In the past, sweetpotato morphological traits such as vine vigor, ground cover, foliage weight, storage root stalk (neck length), storage root cortex thickness, storage root size, storage root shape, storage root formation (arrangement), root latex production, and dry matter content were documented to have a significant impact on enhancing SPW field resistance [43]. However, through a correlation and path coefficient analysis, neck length was identified as the key morphological SPW resistance predictor [53]. Clones with a long storage root neck length ensure the placement of storage roots deeper in the soil.…”

Section: Progress In Breeding For Resistance To Cylas Sppmentioning

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

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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.

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“…Similarly, hybrids from genetically divergent parents have previously demonstrated greater degrees of heterosis compared to those that are from closely related parents (Liu et al 2020 ). However, divergent genetic backgrounds may lead to reproductive isolation between two individuals (Ouyang and Zhang 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Heterotic gains, transgressive segregation and fitness cost of sweetpotato weevil resistance expression in a partial diallel cross of sweetpotato

Mugisa,

Karungi,

Musana

et al. 2023

Euphytica

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Heterosis-exploiting breeding schemes are currently under consideration as a means of accelerating genetic gains in sweetpotato (Ipomoea batatas) breeding. This study was aimed at establishing heterotic gains, fitness costs and transgressive segregation associated with sweetpotato weevil (SPW) resistance in a partial diallel cross of sweetpotato. A total of 1896 clones were tested at two sites, for two seasons each in Uganda. Data on weevil severity (WED), weevil incidence (WI), storage root yield (SRY) and dry matter content (DM) were obtained. Best linear unbiased predictors (BLUPs) for each clone across environments were used to estimate heterotic gains and for regression analyses to establish relationships between key traits. In general, low mid-parent heterotic gains were detected with the highest favorable levels recorded for SRY (14.7%) and WED (− 7.9%). About 25% of the crosses exhibited desirable and significant mid-parent heterosis for weevil resistance. Over 16% of the clones displayed superior transgressive segregation, with the highest percentages recorded for SRY (21%) and WED (18%). A yield penalty of 10% was observed to be associated with SPW resistance whereas no decline in DM was detected in relation to the same. Chances of improving sweetpotato through exploiting heterosis in controlled crosses using parents of mostly similar background are somewhat minimal, as revealed by the low heterotic gains. The yield penalty detected due to SPW resistance suggests that a trade-off may be necessary between maximizing yields and developing weevil-resistant cultivars if the current needs for this crop are to be met in weevil-prone areas.

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Identification of the key morphological sweetpotato weevil resistance predictors in Ugandan sweetpotato genotypes using correlation and path‐coefficient analysis

Cited by 3 publications

References 44 publications

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

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

Heterotic gains, transgressive segregation and fitness cost of sweetpotato weevil resistance expression in a partial diallel cross of sweetpotato

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