The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
W W Hanna - One of the best experts on this subject based on the ideXlab platform.
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Resistance to Striga hermonthica in Wild Accessions of the Primary Gene Pool of Pennisetum glaucum.
Phytopathology, 2000Co-Authors: J. P. Wilson, D.e Hess, W W HannaAbstract:Wilson, J. P., Hess, D. E., and Hanna, W. W. 2000. Resistance to Striga hermonthica in wild accessions of the primary gene pool of Pennisetum glaucum. Phytopathology 90:1169-1172. Resistance to Striga hermonthica in 274 wild Pennisetum glaucum subsp. monodii and stenostachyum accessions was evaluated at Samanko, Mali in 1997 and 1998, and at Cinzana, Mali and Sadore, Niger in 1998. Data recorded included number of striga plants per plot at least three times during the season, date of striga emergence, number of Pennisetum plants, Pennisetum anthesis date, and downy mildew incidence (caused by Sclerospora graminicola). Across trials, the average maximum number of striga per host plant ranged from 0.9 to 8.3. Average days to striga emergence ranged from 54 to 68 days across trials, and was negatively correlated (P < 0.01) with maximum striga within trials. Days to Pennisetum flowering ranged from 54 to 74 days across trials. Host flowering was correlated (P < 0.05) positively with maximum striga at Samanko in 1997 and 1998, but negatively at Cinzana. Downy mildew incidence ranged from 10 to 32% across trials, and was negatively correlated with maximum striga in three trials. Days to striga emergence and Pennisetum flowering were significant covariates affecting maximum striga values, but downy mildew incidence was not. Least squares means of maximum striga across trials averaged 5.7, and ranged from ‐0.2 to 19.1 striga per host plant. Broad-sense heritability of observed maximum striga was estimated to be 0.55. Agar-gel assays conducted in the laboratory were ineffective in identifying differences in stimulating striga seed germination among selected accessions. Variables not directly related to genetic resistance can affect maximum striga emergence in the field, and their identification may allow more effective resistance screening.
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Disease resistance in wild Pennisetum species
Plant Disease, 1992Co-Authors: J. P. Wilson, W W HannaAbstract:Ninety-eight accessions of wild Pennisetum glaucum from the primary gene pool (1 o Pennisetums) and 27 species from the tertiary gene pool (3 o Pennisetums) of P. glaucum were evaluated for disease resistance. The 1 o Pennisetums were also evaluated for morphologic traits to further differentiate the accessions. The 1 o Pennisetums were evaluated for resistance to Pyricularia grisea, Puccinia substriata var. indica, and Moesziomyces penicillariae and also for height, diameter of the fifth internode, number of nodes, heading date, and panicle length and morphology (.)
Xiaomao Wang - One of the best experts on this subject based on the ideXlab platform.
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Pennisetum sinese roxb and Pennisetum purpureum schum as vertical flow constructed wetland vegetation for removal of n and p from domestic sewage
Ecological Engineering, 2015Co-Authors: Qiaoling Xu, Zhujian Hunag, Xiaomao WangAbstract:Abstract In this study, two bioenergy plants, namely the Pennisetum sinese Roxb and Pennisetum purpureum Schum., were selected as wetland vegetation to remove nitrogen (N) and phosphorous (P) in vertical-flow constructed wetland (CW) systems. The total net nutrient accumulation by CW plants was 104 g N/m 2 and 7.6 g P/m 2 for Pennisetum sinese Roxb, 144 g N/m 2 and 8.71 g P/m 2 for Pennisetum purpureum Schum . Three CW systems (System A planting with Pennisetum sinese Roxb, System B planting with Pennisetum purpureum Schum., and System C without planting) were designed to evaluate total nitrogen (TN) and total phosphorus (TP) removal efficiency from wastewater. Results showed that the removal efficiency of TP from both System A and System B were significantly higher than that of System C, but there are no significant differences of the removal of TN among the three CW systems. After a five-month CW operation, System C was clogged and the TP removal efficiency was negative due to desorption of TP from the substrate. Our study demonstrated that the two newly selected plant species had a positive effect on removing TN and TP from wastewater and reducing clogging in the CW systems.
J. P. Wilson - One of the best experts on this subject based on the ideXlab platform.
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Resistance to Striga hermonthica in Wild Accessions of the Primary Gene Pool of Pennisetum glaucum.
Phytopathology, 2000Co-Authors: J. P. Wilson, D.e Hess, W W HannaAbstract:Wilson, J. P., Hess, D. E., and Hanna, W. W. 2000. Resistance to Striga hermonthica in wild accessions of the primary gene pool of Pennisetum glaucum. Phytopathology 90:1169-1172. Resistance to Striga hermonthica in 274 wild Pennisetum glaucum subsp. monodii and stenostachyum accessions was evaluated at Samanko, Mali in 1997 and 1998, and at Cinzana, Mali and Sadore, Niger in 1998. Data recorded included number of striga plants per plot at least three times during the season, date of striga emergence, number of Pennisetum plants, Pennisetum anthesis date, and downy mildew incidence (caused by Sclerospora graminicola). Across trials, the average maximum number of striga per host plant ranged from 0.9 to 8.3. Average days to striga emergence ranged from 54 to 68 days across trials, and was negatively correlated (P < 0.01) with maximum striga within trials. Days to Pennisetum flowering ranged from 54 to 74 days across trials. Host flowering was correlated (P < 0.05) positively with maximum striga at Samanko in 1997 and 1998, but negatively at Cinzana. Downy mildew incidence ranged from 10 to 32% across trials, and was negatively correlated with maximum striga in three trials. Days to striga emergence and Pennisetum flowering were significant covariates affecting maximum striga values, but downy mildew incidence was not. Least squares means of maximum striga across trials averaged 5.7, and ranged from ‐0.2 to 19.1 striga per host plant. Broad-sense heritability of observed maximum striga was estimated to be 0.55. Agar-gel assays conducted in the laboratory were ineffective in identifying differences in stimulating striga seed germination among selected accessions. Variables not directly related to genetic resistance can affect maximum striga emergence in the field, and their identification may allow more effective resistance screening.
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Disease resistance in wild Pennisetum species
Plant Disease, 1992Co-Authors: J. P. Wilson, W W HannaAbstract:Ninety-eight accessions of wild Pennisetum glaucum from the primary gene pool (1 o Pennisetums) and 27 species from the tertiary gene pool (3 o Pennisetums) of P. glaucum were evaluated for disease resistance. The 1 o Pennisetums were also evaluated for morphologic traits to further differentiate the accessions. The 1 o Pennisetums were evaluated for resistance to Pyricularia grisea, Puccinia substriata var. indica, and Moesziomyces penicillariae and also for height, diameter of the fifth internode, number of nodes, heading date, and panicle length and morphology (.)
Petrus Emeka Nwakpu - One of the best experts on this subject based on the ideXlab platform.
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PERFORMANCE OF SHEEP GRAZING Brachiaria decumbens, Panicum maximum and Pennisetum purpureum IN COMBINATION WITH Gliricidia sepium
Animal Research International, 2008Co-Authors: Isaac Ikechukwu Osakwe, Petrus Emeka NwakpuAbstract:The introduction of forage legumes into grass pastures has generally improved grazing animal production by increasing total edible biomass and nutrient profiles. An experiment was designed to study the performance of sheep grazing Brachiaria decumbens, Panicum maximum and Pennisetum purpureum in combination with Gliricidia sepium. Eighteen paddocks of approximately 0.03 ha were used in the trial. Nine of the paddocks had Gliricidia sepium alley planted in rows 4 m apart and interplanted with 4 rows of either Brachiaria decumbens, Panicum maximum, or Pennisetum purpureum. The other nine paddocks had only the grass species without the Gliricidia sepium. The paddocks were each grazed by 3 sheep. The pure grass stands without the Gliricidia sepium served as controls for the grass species in combination with Gliricidia sepium. The three grasses and their combinations within the alley plots were replicated three times.The animals were grazed continuously for 28 days in the sub plots. Sheep grazing the Gliricidia/Panicum plot had a higher (P 0.05) between sheep grazing the Gliricidia/Bracharia and Gliricidia/Pennisetum plots. The total dry matter intake of sheep on the Gliricidia/Panicum plot was higher (P < 0.05) (1.33 kg DM d-1) than that of sheep on Gliricidia/Bracharia (0.86 kg DM d-1) and Gliricidia/Pennisetum (0.43 kg DM d-1) plots respectively. The total biomass from the Gliricidia/Bracharia (23 t ha -1)and Gliricidia/Panicum (21 t ha -1) plots respectively were higher (P < 0.01) than the total biomass from the Gliricidia/Pennisetum ( 13 t ha -1) plot. These results demonstrate that grazing West African dwarf sheep in a Gliricidia sepium/Panicum maximum plot improved their growth rate during dry season when feed supplies are limited. It also underscores the poor performance of animals grazing Pennisetum purpureum in Gliricidia sepium alley plot.
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PERFORMANCE OF SHEEP GRAZING Brachiaria decumbens, Panicum maximum and Pennisetum purpureum IN COMBINATION WITH Gliricidia sepium
Animal Research International, 2008Co-Authors: Isaac Ikechukwu Osakwe, Petrus Emeka NwakpuAbstract:The introduction of forage legumes into grass pastures has generally improved grazing animal production by increasing total edible biomass and nutrient profiles. An experiment was designed to study the performance of sheep grazing Brachiaria decumbens, Panicum maximum and Pennisetum purpureum in combination with Gliricidia sepium. Eighteen paddocks of approximately 0.03 ha were used in the trial. Nine of the paddocks had Gliricidia sepium alley planted in rows 4 m apart and interplanted with 4 rows of either Brachiaria decumbens, Panicum maximum, or Pennisetum purpureum. The other nine paddocks had only the grass species without the Gliricidia sepium. The paddocks were each grazed by 3 sheep. The pure grass stands without the Gliricidia sepium served as controls for the grass species in combination with Gliricidia sepium. The three grasses and their combinations within the alley plots were replicated three times.The animals were grazed continuously for 28 days in the sub plots. Sheep grazing the Gliricidia/Panicum plot had a higher (P 0.05) between sheep grazing the Gliricidia/Bracharia and Gliricidia/Pennisetum plots. The total dry matter intake of sheep on the Gliricidia/Panicum plot was higher (P < 0.05) (1.33 kg DM d-1) than that of sheep on Gliricidia/Bracharia (0.86 kg DM d-1) and Gliricidia/Pennisetum (0.43 kg DM d-1) plots respectively. The total biomass from the Gliricidia/Bracharia (23 t ha -1)and Gliricidia/Panicum (21 t ha -1) plots respectively were higher (P < 0.01) than the total biomass from the Gliricidia/Pennisetum ( 13 t ha -1) plot. These results demonstrate that grazing West African dwarf sheep in a Gliricidia sepium/Panicum maximum plot improved their growth rate during dry season when feed supplies are limited. It also underscores the poor performance of animals grazing Pennisetum purpureum in Gliricidia sepium alley plot.
Qiaoling Xu - One of the best experts on this subject based on the ideXlab platform.
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Pennisetum sinese roxb and Pennisetum purpureum schum as vertical flow constructed wetland vegetation for removal of n and p from domestic sewage
Ecological Engineering, 2015Co-Authors: Qiaoling Xu, Zhujian Hunag, Xiaomao WangAbstract:Abstract In this study, two bioenergy plants, namely the Pennisetum sinese Roxb and Pennisetum purpureum Schum., were selected as wetland vegetation to remove nitrogen (N) and phosphorous (P) in vertical-flow constructed wetland (CW) systems. The total net nutrient accumulation by CW plants was 104 g N/m 2 and 7.6 g P/m 2 for Pennisetum sinese Roxb, 144 g N/m 2 and 8.71 g P/m 2 for Pennisetum purpureum Schum . Three CW systems (System A planting with Pennisetum sinese Roxb, System B planting with Pennisetum purpureum Schum., and System C without planting) were designed to evaluate total nitrogen (TN) and total phosphorus (TP) removal efficiency from wastewater. Results showed that the removal efficiency of TP from both System A and System B were significantly higher than that of System C, but there are no significant differences of the removal of TN among the three CW systems. After a five-month CW operation, System C was clogged and the TP removal efficiency was negative due to desorption of TP from the substrate. Our study demonstrated that the two newly selected plant species had a positive effect on removing TN and TP from wastewater and reducing clogging in the CW systems.
