Pheneas Ntawuruhunga - Academia.edu (original) (raw)
Papers by Pheneas Ntawuruhunga
Genetic Resources and Crop Evolution, Jun 15, 2023
The FASEB Journal, 2010
Wisdom Akpalu Imad Ali Babiker Esteban Alonso Zhisheng An Fredrik Andersson Timothy Aremu Xuemei ... more Wisdom Akpalu Imad Ali Babiker Esteban Alonso Zhisheng An Fredrik Andersson Timothy Aremu Xuemei Bai Naresh Bainsla Mansoor Baloch Heiko Balzter Kunshan Bao Edward Barbier Åsa Berggren Ann-Kristin Bergström Lars Bergström Dan Binkley Sara Brogaard Steven Brown Karl Bruckmeir Tom Buijse Gregory Carmichael Dan Childers Marianne Clarholm Carol J. P. Colfer Rita Colwell Kathryn Cottingham Joris Cromsigt Mike Crosby Margarita Cuadra Ika Darnhofer Wil de Jong Maricela de la Torre Castro Franciska de Vries Stéphane Descloux Lisa Deutsch Martin Diekmann Nancy Dise Puneet Dwivedi Barry Eakins Håkan Eggert Olusegun Ekanade Petri Ekholm Lisa Ernoul Malin Falkenmark Steve Farber Adam Felton Cristian-Alarcon Ferrari Lincoln Fishpool Ferdinando Fornara Olle Forshed Christos Fountoukis Peter Fredman Martyn Futter Gloria Gallardo Ken Giller Stefan Gossling John Gowdy Nancy Grimm Peter Groffman Nomana Hadi Cathy Hair Colin Michael Hall Kjell Havnevik Joel Heinen Jani Heino Olle Hjerne Henry Huntingt...
Journal of Dairy Science, 2007
The additive main effects and multiplicative interaction (AMMI) model and genotype main effects a... more The additive main effects and multiplicative interaction (AMMI) model and genotype main effects and genotype-by-environment interaction (GGE) biplot are commonly used to analyze multi environmental trial data. This study adopted the AMMI model and GGE biplot to comprehensively analyze the data on genotypes tested in the 2016-2017 Zhongcheng combined regional maize trial in China. Results showed that the traits highly and significantly differed across different genotypes (G) and environments (E). Significant or very significant genotype-by-environment interactions (GEI) were also found. With the exception of 100-kernel weight, the ratio of GEI for the remaining three traits was lower than that of E and higher than that of G. GEI was decomposed, and the interaction information of PCA1 and PCA2 in the interaction of four traits was significant. Hengyu1587 and Shiyu 1503 performed better than the other hybrids and were identified as excellent varieties across locations because of their outstanding performances according to a 2-year observation. The comprehensive utilization of the AMMI model and GGE biplot can enable the scientific and objective judgment of the high yield, stability, and adaptability of tested maize hybrids and provides theoretical support for the rational layout of maize hybrids in the environments of Hebei Province.
Fig 1. IIAM root and tubers program team with the SARRNET coordinator appreciating one released v... more Fig 1. IIAM root and tubers program team with the SARRNET coordinator appreciating one released varieties in Nampula, Mozambique
Frontiers in Sustainable Food Systems
IntroductionCassava (Manihot esculanta) is becoming an important crop in most developing countrie... more IntroductionCassava (Manihot esculanta) is becoming an important crop in most developing countries, especially Zambia. However, cassava roots deteriorate quickly after harvest, producing flour or chips of sub-optimal quality. Hence the evaluation of processing procedures to extend the product's shelf-life cannot be overemphasized. This study investigated the effects of different drying methods on the chemical, functional and pasting properties of selected advanced cassava clones grown in Zambia.MethodsFresh Roots of the seven cassava clones (harvested 12 months after planting) were sampled, peeled, washed and dried using the three drying methods (sun-drying, oven-drying and freeze-drying). The flour samples from these drying methods were analyzed using standard laboratory methods for primary chemical, functional and pasting properties. The data generated were statistically analyzed for descriptive, analysis of variance (ANOVA), and the means were separated at p < 0.05.Results...
Journal of Agriculture and Food Research
Baseline characterization of production and markets, technologies and preferences, and livelihood... more Baseline characterization of production and markets, technologies and preferences, and livelihoods of smallholder farmers and communities affected by HIV/AIDS in Mozambique. 49 pp.
AIMS Agriculture and Food, 2020
High-quality cassava flour (HQCF) is a cheaper alternative to wheat in the production of snacks. ... more High-quality cassava flour (HQCF) is a cheaper alternative to wheat in the production of snacks. This study assessed the nutritional properties and consumer acceptability of cassava-legume snacks in Zambia. Cassava snacks were made from 100% HQCF, 50:50 cassava-soybean flour blend, 50:50 cassava-cowpea flour blend and 100% wheat flour as the control. The samples were analyzed for nutritional, functional and anti-nutritional properties using standard laboratory methods. Also, a well-outlined questionnaire was used to collect data on consumer preferences. The results showed a significant (P < 0.05) effect of product type on all the proximate components except starch that had no significant effect (P < 0.05). There was a significant (P < 0.05) increase in ash, protein and fat contents but a decrease in total sugars, amylose and starch contents of the legume-fortified snacks when compared with 100% cassava snacks. Cassava-legume snacks had a high acceptance in Kasama, Kaoma and Mansa districts, with a better preference for the cowpea variant of tidbit. There was a positive linear relationship between snack sensory characteristics (aroma, taste and texture) and consumer willingnessto-pay (WTP). The results show that snacks that are acceptable, affordable, nutritious and of excellent preference characteristics can be produced from cassava and legumes for households in Zambia.
Cogent Food & Agriculture, 2019
Fritters are flour-based snacks made from wheat flour, but a cheaper alternative is needed in a d... more Fritters are flour-based snacks made from wheat flour, but a cheaper alternative is needed in a developing economy, such as Zambia, owing to the high cost of wheat. This study aimed at evaluating fritters produced from different sources: fresh cassava roots, high-quality cassava flour (HQCF), and a composite (80:20) of HQCF and high-quality soy flour (HQSF) using 100% wheat flour as the control. The nutritional and anti-nutritional properties were analyzed with standard laboratory methods. A structured questionnaire was used to analyze consumer preferences. There were significant (P < 0.05) differences in the proximate parameters of the fritters samples. In HQCF fritters, amylose increased by 12.26%, sugar by 11.12%, and starch by 27.91%. There were no significant (P > 0.05) differences in the antinutritional properties among cassava and wheat fritters except for the composite cassava-soybean fritters. Among respondents from Kaoma, Kasama, and Serenje, the sensory characteristics showed no significant (P > 0.05) differences ABOUT THE AUTHORS Dr. Alamu, Emmanuel Oladeji, a Nigerian, is a Food Scientist and Technologist working with IITA-Zambia. His research interests are chemistry of food formulations, food analysis, biofortification, product developments, sensory evaluation and consumer tests of the developed products Dr. Ntawuruhunga Pheneas is a cassava breeder working with the (IITA), Southern Africa Hub, Lusaka, Zambia. He has a lot of experience in capacity building and coordinating cassava value chain projects.
African Journal of Agricultural Research, 2016
This study was conducted to evaluate the growth and yield stability of cassava mosaic disease (CM... more This study was conducted to evaluate the growth and yield stability of cassava mosaic disease (CMD) resistant breeding populations clones against early drought. Field trials were planted using 200 CMD resistant clones and 7 local landraces in a randomised complete block design with 3 replicates at the International Institute of Tropical Agriculture (IITA) station, Sendusu in Namulonge (Central Uganda) during the second rains of 2006 (2006B) and the first rains of 2007 (2007A). The 2007A crop suffered from drought stress in the first 4 months after planting (MAP). Data were taken on the leaf lobe length and width at 6 MAP and plant height at 12 MAP. Harvest was done at 12 MAP during which the number of storage roots per plant and storage root yield were recorded. Data were analysed using the Mann-Whitney U test to compare crop performance between the 2 seasons. The 2006B crop had significantly (P<0.01) longer leaf lobes, taller plant heights, higher number of storage roots per pla...
Allows to obtain large number of seeds early for late flowering genotypes. implemented at CIAT to... more Allows to obtain large number of seeds early for late flowering genotypes. implemented at CIAT to shorten the duration of the pollination season from 16 to 10 months and increase the seeds for erect and late flowering progenitors The flower inducing technology includes photoperiod extension, pruning, and application of BA (6-Benzylaminopurine). Cassava-flowering inducing technology DN, dark night; EP, Extended Photoperiod, NP, no pruning; P1st, pruning at the first branch; P2nd, pruning at the end branch; P1st + BA, pruning at the first branch and application of BA; P2nd + BA, pruning at the second branch and application of BA;
This paper measures the economic impacts of IITA/SARRNET led cassava improvement research in Mala... more This paper measures the economic impacts of IITA/SARRNET led cassava improvement research in Malawi and Zambia over the period 1990-2008. The data come from sample household surveys, expert opinion surveys, and a series of cassava improvement experiments conducted in the two countries. Past investments in cassava improvement have led to the development and release of a good number of high-yielding cassava varieties. The results show relatively higher adoption rates for the CMD-free local varieties compared to CMD-resistant modern varieties that have been released in the two countries. The adoption of new varieties has been low and slow largely due to the fact that most of these varieties lacked the consumption attributes highly valued by farmers. The multiplication and distribution of CMD-free planting materials of the recommended local varieties led to greater adoption, but infection with CMD three to four years after adoption meant that the yield gains and economic benefits could not be sustained. Nevertheless, the multiplication and distribution of clean cassava planting materials generated a modest rate of return of 18%, which is actually consistent with an earlier rate of return estimate of 9 to 22% for cassava improvement in developing countries. Analysis of the ex ante impacts of current and future investments in cassava improvement from 2009 to 2050 shows that cassava improvement research that focuses on the development and dissemination of varieties with highly preferred consumption and industrial attributes would yield a greater rate of return of 40%
Transforming Agriculture in Southern Africa, 2019
Potential negative impacts of mycotoxins in the SADC region Chronic exposure to mycotoxins (espec... more Potential negative impacts of mycotoxins in the SADC region Chronic exposure to mycotoxins (especially aflatoxins, ochratoxin A, fumoni sins and ergot alkaloids) may result in health problems such as liver, renal and esophagus cancers, retarded child growth, weakened immunity, reduced fertil ity, damaged nervous system, egotism and neural tube effects in humans (Wu
Genetic Resources and Crop Evolution, Jun 15, 2023
The FASEB Journal, 2010
Wisdom Akpalu Imad Ali Babiker Esteban Alonso Zhisheng An Fredrik Andersson Timothy Aremu Xuemei ... more Wisdom Akpalu Imad Ali Babiker Esteban Alonso Zhisheng An Fredrik Andersson Timothy Aremu Xuemei Bai Naresh Bainsla Mansoor Baloch Heiko Balzter Kunshan Bao Edward Barbier Åsa Berggren Ann-Kristin Bergström Lars Bergström Dan Binkley Sara Brogaard Steven Brown Karl Bruckmeir Tom Buijse Gregory Carmichael Dan Childers Marianne Clarholm Carol J. P. Colfer Rita Colwell Kathryn Cottingham Joris Cromsigt Mike Crosby Margarita Cuadra Ika Darnhofer Wil de Jong Maricela de la Torre Castro Franciska de Vries Stéphane Descloux Lisa Deutsch Martin Diekmann Nancy Dise Puneet Dwivedi Barry Eakins Håkan Eggert Olusegun Ekanade Petri Ekholm Lisa Ernoul Malin Falkenmark Steve Farber Adam Felton Cristian-Alarcon Ferrari Lincoln Fishpool Ferdinando Fornara Olle Forshed Christos Fountoukis Peter Fredman Martyn Futter Gloria Gallardo Ken Giller Stefan Gossling John Gowdy Nancy Grimm Peter Groffman Nomana Hadi Cathy Hair Colin Michael Hall Kjell Havnevik Joel Heinen Jani Heino Olle Hjerne Henry Huntingt...
Journal of Dairy Science, 2007
The additive main effects and multiplicative interaction (AMMI) model and genotype main effects a... more The additive main effects and multiplicative interaction (AMMI) model and genotype main effects and genotype-by-environment interaction (GGE) biplot are commonly used to analyze multi environmental trial data. This study adopted the AMMI model and GGE biplot to comprehensively analyze the data on genotypes tested in the 2016-2017 Zhongcheng combined regional maize trial in China. Results showed that the traits highly and significantly differed across different genotypes (G) and environments (E). Significant or very significant genotype-by-environment interactions (GEI) were also found. With the exception of 100-kernel weight, the ratio of GEI for the remaining three traits was lower than that of E and higher than that of G. GEI was decomposed, and the interaction information of PCA1 and PCA2 in the interaction of four traits was significant. Hengyu1587 and Shiyu 1503 performed better than the other hybrids and were identified as excellent varieties across locations because of their outstanding performances according to a 2-year observation. The comprehensive utilization of the AMMI model and GGE biplot can enable the scientific and objective judgment of the high yield, stability, and adaptability of tested maize hybrids and provides theoretical support for the rational layout of maize hybrids in the environments of Hebei Province.
Fig 1. IIAM root and tubers program team with the SARRNET coordinator appreciating one released v... more Fig 1. IIAM root and tubers program team with the SARRNET coordinator appreciating one released varieties in Nampula, Mozambique
Frontiers in Sustainable Food Systems
IntroductionCassava (Manihot esculanta) is becoming an important crop in most developing countrie... more IntroductionCassava (Manihot esculanta) is becoming an important crop in most developing countries, especially Zambia. However, cassava roots deteriorate quickly after harvest, producing flour or chips of sub-optimal quality. Hence the evaluation of processing procedures to extend the product's shelf-life cannot be overemphasized. This study investigated the effects of different drying methods on the chemical, functional and pasting properties of selected advanced cassava clones grown in Zambia.MethodsFresh Roots of the seven cassava clones (harvested 12 months after planting) were sampled, peeled, washed and dried using the three drying methods (sun-drying, oven-drying and freeze-drying). The flour samples from these drying methods were analyzed using standard laboratory methods for primary chemical, functional and pasting properties. The data generated were statistically analyzed for descriptive, analysis of variance (ANOVA), and the means were separated at p < 0.05.Results...
Journal of Agriculture and Food Research
Baseline characterization of production and markets, technologies and preferences, and livelihood... more Baseline characterization of production and markets, technologies and preferences, and livelihoods of smallholder farmers and communities affected by HIV/AIDS in Mozambique. 49 pp.
AIMS Agriculture and Food, 2020
High-quality cassava flour (HQCF) is a cheaper alternative to wheat in the production of snacks. ... more High-quality cassava flour (HQCF) is a cheaper alternative to wheat in the production of snacks. This study assessed the nutritional properties and consumer acceptability of cassava-legume snacks in Zambia. Cassava snacks were made from 100% HQCF, 50:50 cassava-soybean flour blend, 50:50 cassava-cowpea flour blend and 100% wheat flour as the control. The samples were analyzed for nutritional, functional and anti-nutritional properties using standard laboratory methods. Also, a well-outlined questionnaire was used to collect data on consumer preferences. The results showed a significant (P < 0.05) effect of product type on all the proximate components except starch that had no significant effect (P < 0.05). There was a significant (P < 0.05) increase in ash, protein and fat contents but a decrease in total sugars, amylose and starch contents of the legume-fortified snacks when compared with 100% cassava snacks. Cassava-legume snacks had a high acceptance in Kasama, Kaoma and Mansa districts, with a better preference for the cowpea variant of tidbit. There was a positive linear relationship between snack sensory characteristics (aroma, taste and texture) and consumer willingnessto-pay (WTP). The results show that snacks that are acceptable, affordable, nutritious and of excellent preference characteristics can be produced from cassava and legumes for households in Zambia.
Cogent Food & Agriculture, 2019
Fritters are flour-based snacks made from wheat flour, but a cheaper alternative is needed in a d... more Fritters are flour-based snacks made from wheat flour, but a cheaper alternative is needed in a developing economy, such as Zambia, owing to the high cost of wheat. This study aimed at evaluating fritters produced from different sources: fresh cassava roots, high-quality cassava flour (HQCF), and a composite (80:20) of HQCF and high-quality soy flour (HQSF) using 100% wheat flour as the control. The nutritional and anti-nutritional properties were analyzed with standard laboratory methods. A structured questionnaire was used to analyze consumer preferences. There were significant (P < 0.05) differences in the proximate parameters of the fritters samples. In HQCF fritters, amylose increased by 12.26%, sugar by 11.12%, and starch by 27.91%. There were no significant (P > 0.05) differences in the antinutritional properties among cassava and wheat fritters except for the composite cassava-soybean fritters. Among respondents from Kaoma, Kasama, and Serenje, the sensory characteristics showed no significant (P > 0.05) differences ABOUT THE AUTHORS Dr. Alamu, Emmanuel Oladeji, a Nigerian, is a Food Scientist and Technologist working with IITA-Zambia. His research interests are chemistry of food formulations, food analysis, biofortification, product developments, sensory evaluation and consumer tests of the developed products Dr. Ntawuruhunga Pheneas is a cassava breeder working with the (IITA), Southern Africa Hub, Lusaka, Zambia. He has a lot of experience in capacity building and coordinating cassava value chain projects.
African Journal of Agricultural Research, 2016
This study was conducted to evaluate the growth and yield stability of cassava mosaic disease (CM... more This study was conducted to evaluate the growth and yield stability of cassava mosaic disease (CMD) resistant breeding populations clones against early drought. Field trials were planted using 200 CMD resistant clones and 7 local landraces in a randomised complete block design with 3 replicates at the International Institute of Tropical Agriculture (IITA) station, Sendusu in Namulonge (Central Uganda) during the second rains of 2006 (2006B) and the first rains of 2007 (2007A). The 2007A crop suffered from drought stress in the first 4 months after planting (MAP). Data were taken on the leaf lobe length and width at 6 MAP and plant height at 12 MAP. Harvest was done at 12 MAP during which the number of storage roots per plant and storage root yield were recorded. Data were analysed using the Mann-Whitney U test to compare crop performance between the 2 seasons. The 2006B crop had significantly (P<0.01) longer leaf lobes, taller plant heights, higher number of storage roots per pla...
Allows to obtain large number of seeds early for late flowering genotypes. implemented at CIAT to... more Allows to obtain large number of seeds early for late flowering genotypes. implemented at CIAT to shorten the duration of the pollination season from 16 to 10 months and increase the seeds for erect and late flowering progenitors The flower inducing technology includes photoperiod extension, pruning, and application of BA (6-Benzylaminopurine). Cassava-flowering inducing technology DN, dark night; EP, Extended Photoperiod, NP, no pruning; P1st, pruning at the first branch; P2nd, pruning at the end branch; P1st + BA, pruning at the first branch and application of BA; P2nd + BA, pruning at the second branch and application of BA;
This paper measures the economic impacts of IITA/SARRNET led cassava improvement research in Mala... more This paper measures the economic impacts of IITA/SARRNET led cassava improvement research in Malawi and Zambia over the period 1990-2008. The data come from sample household surveys, expert opinion surveys, and a series of cassava improvement experiments conducted in the two countries. Past investments in cassava improvement have led to the development and release of a good number of high-yielding cassava varieties. The results show relatively higher adoption rates for the CMD-free local varieties compared to CMD-resistant modern varieties that have been released in the two countries. The adoption of new varieties has been low and slow largely due to the fact that most of these varieties lacked the consumption attributes highly valued by farmers. The multiplication and distribution of CMD-free planting materials of the recommended local varieties led to greater adoption, but infection with CMD three to four years after adoption meant that the yield gains and economic benefits could not be sustained. Nevertheless, the multiplication and distribution of clean cassava planting materials generated a modest rate of return of 18%, which is actually consistent with an earlier rate of return estimate of 9 to 22% for cassava improvement in developing countries. Analysis of the ex ante impacts of current and future investments in cassava improvement from 2009 to 2050 shows that cassava improvement research that focuses on the development and dissemination of varieties with highly preferred consumption and industrial attributes would yield a greater rate of return of 40%
Transforming Agriculture in Southern Africa, 2019
Potential negative impacts of mycotoxins in the SADC region Chronic exposure to mycotoxins (espec... more Potential negative impacts of mycotoxins in the SADC region Chronic exposure to mycotoxins (especially aflatoxins, ochratoxin A, fumoni sins and ergot alkaloids) may result in health problems such as liver, renal and esophagus cancers, retarded child growth, weakened immunity, reduced fertil ity, damaged nervous system, egotism and neural tube effects in humans (Wu