Morphological Characterization of Ugandan Sweetpotato Germplasm

Yada, Benard; Tukamuhabwa, Phinehas; Alajo, Agnes; Mwanga, R.O.M.

doi:10.2135/cropsci2009.04.0199

Cited by 24 publications

(26 citation statements)

References 18 publications

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“…Identifying highly correlated traits could reduce the number of traits needed for germplasm characterization. Yada et al (2010) identified leaf traits to be effective when used with other correlated traits for the characterization of sweet potato collections. Results from the present study suggests that using a selection index that contains high canopy, high seed weight, high total dry matter, high HI, and high fodder yield will improve grain yield of cowpea.…”

Section: Results and Discussion Mean Agronomic Performance Of The Culmentioning

confidence: 99%

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Agronomic evaluation of cowpea cultivars developed for the West African Savannas

Kamara

Ewansiha

Ajeigbe

et al. 2017

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The goal of this research was to evaluate diverse cowpea genotypes developed over the past 4 decades in the Nigerian Sudan Savannas for their agronomic performance and to identify groups of cultivars with similar quantitative characters. Characterization would facilitate the efficient synthesis of breeding populations for further improvement of cowpea. Also superior genotypes with desirable characteristics could be identified and disseminated in the dry savannas of West Africa. Significant variations were observed in the agronomic characteristics of the cultivars in this study. Principal component analysis (PCA) and cluster analysis were performed on these genotypes and found that there were significant correlations among the variables measured. Modern cultivars outperformed the older ones and from the results of PCA, it was found that the most important variables for the classification of cowpea cultivars are high canopy, high seed weight, high total dry matter, high HI, and high grain and fodder yield. This suggests that these traits could be used in selection index for genetic improvement of cowpea. Cluster analysis resulted in 5 groups mostly corresponding to era of release except cluster I which contained cowpea cultivars from all eras. Two distinct groups in clusters IV and V were identified. Cultivars in cluster IV which were released in the 1990-2000 eras, had high grain and fodder yield. These cultivars could be evaluated on-farm for eventual release to farmers. They could also be used in breeding program for improvements in grain and fodder yield of cowpea. Cluster V contained two cultivars that distinctly had the highest fodder yield suggesting that they could be used to improve fodder yield of cowpea.

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Section: Results and Discussion Mean Agronomic Performance Of The Culmentioning

confidence: 99%

“…Principal component analysis was used to determine the relative importance of the 11 traits used in the study (Jackson, 1991;Yada et al, 2010). The correlation between the 11 traits and their Eigen values was used as a basis for the identification of the principal components (PCs) in the study (Yada et al, 2010).…”

Section: Principal Component Analysismentioning

confidence: 99%

Agronomic evaluation of cowpea cultivars developed for the West African Savannas

Kamara

Ewansiha

Ajeigbe

et al. 2017

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“…It is located at 00 32'' N of the Equator and 32° 37'' E. It is 27 Km North of Kampala at an elevation of 1150 metres above-sea-level. It has a tropical wet and mild dry climate with slightly humid conditions (average 65%), with two rainy seasons (Yada et al, 2010). This location is ideal for evaluations on snap bean because; (i) it is located in the snap bean growing area in the country; and (ii) the two rainy seasons of approximately the same length (3 months each) offer the chance to carry out trials twice a year.…”

Section: Foliar Applicationmentioning

confidence: 99%

Effectiveness and profitability of insecticide formulations used for managing snap bean pests

Otim¹,

Kasina²,

Nderitu³

et al. 2017

Uganda Journal of Agricultural Sciences

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Snap bean (Phaseolus vulgaris L.) farmers rely mostly on insecticides to manage pests and to satisfy the stringent market requirements for insect and blemish-free pods. However, the cost of these pesticides lowers farm incomes. In addition, heavy and wrong use of pesticides could result in residue accumulation, which reduces market access by the farmers. To identify optimal pest control with lower economic risks to farmers, we investigated the effectiveness and profitability of different insecticides and insecticide formulations against bean fly (Ophiomyia spp.) and bean flower thrips (Megalurothrips sjostedtii). Two separate experiments were conducted during 2009 to 2012. The first experiment targeted bean fly and bean flower thrips, comprising the treatments: seed dressings, soil drenches, foliar sprays and an untreated control. We used randomised complete block design, with four replicates. All the seed dressing and soil drenching insecticides, except Apron, significantly lowered bean fly infestation by two to 60 fold when compared with control. These insecticides, however, did not control flower thrips. Confidor® resulted in a marginal returns of 0.89 and Actara® -0.11 compared to seed dressings, which ranged from 0.47 to 1.82. The second experiment laid in a randomised complete block design involved the foliar application of Roket® under different spray regimes. Application of Roket® reduced infestation of thrips, and resulted in positive MRR in all the seasons.

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“…The information obtained through the principal component analysis allows identifying the most discriminating and informative morphological descriptors concerning studies on morphological characterization, allowing further studies related to morphological characterization of Ipomoea batatas, reducing and optimizing time for analyses (Yada et al, 2010).…”

Section: Shoot Dry Massmentioning

confidence: 99%

Morpho-agronomic characterization of sweet potato germplasm

et al. 2017

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Sweet potato (Ipomoea batatas) spreads mainly by vegetative propagation, and therefore this vegetable may have duplicate accessions in germplasm banks. The authors aimed to characterize morpho-agronomically the sweet potato germplasm from the Active Germplasm Bank (AGB) of Universidade Federal de Sergipe (UFS). The experiment was carried out at the Research Farm "Campus Rural da UFS". The experimental design was a randomized block design, testing 73 sweet potato accessions with two replicates and four plants per plot. Morpho-agronomic traits of aboveground part and roots were evaluated. We observed that the leaf lobe type, the number of lobes per leaf, shape of central lobe, and general leaf shape were traits which provided the most variability among the accessions. For damage caused by soil insects, 52 accessions showed tolerance. The accessions presented a range from 0.33 to 2.71 t/ha for dry mass of aboveground part and from 1.20 to 10.89 t/ha for the total productivity of the roots. The high phenotypic variability of this crop shows good prospect for breeding programs.

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Morphological Characterization of Ugandan Sweetpotato Germplasm

Cited by 24 publications

References 18 publications

Agronomic evaluation of cowpea cultivars developed for the West African Savannas

Agronomic evaluation of cowpea cultivars developed for the West African Savannas

Effectiveness and profitability of insecticide formulations used for managing snap bean pests

Morpho-agronomic characterization of sweet potato germplasm

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