November 2006
A review on mechanism of plant geotropism: developing trend in research on pine root geotropism
Despite the fundamental importance of gravity-driven growth response in plants, the mechanisms that result in root geotropism are poorly understood and the signaling pathways involved remain elusive. Therefore, we reviewed root gravisensing structures and theories (or propositions) explaining root growth geotropism in directions of genetics, physiology, biochemistry, and environmental influence. The available data show...
November 2006
Seasonal variations of Cd, Cu, Pb and Zn in the edible mollusc Donax trunculus (Mollusca, Bivalvia) from the gulf of Annaba, Algeria
Seasonal variations in the concentrations of four trace heavy metals (cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn)) were determined in Donax trunculus (Mollusca, Bivalvia) at two contaminated sites in the gulf of Annaba (East of Algeria): El Battah and Sidi Salem . The average concentrations of the metals exhibited the following order: Zn>Cu> Pb>Cd for the two sites. The statistical...
November 2006
Strategies to optimize the use of scavengeable feed resource base by smallholders in traditional poultry production systems in Africa: A review
Traditional poultry production accounts for about 80% of the poultry population in Africa. Such poultry species are kept by smallholders, mostly in free-range and in backyard systems for food security, income and socio-cultural purposes. Flock productivity is low compared to high input systems due to sub-optimal management, lack of supplementary feeds, low genetic and diseases. Scavenging system provides most of the...
November 2006
Weather and seasonal effects on growth, seed yield and soluble carbohydrate concentrations in selected maize cultivars in the humid areas of Nigeria.
A study was conducted in 2001 and 2002 to identify genotypic attributes relevant to performance and adaptation of ten maize cultivars grown on the field in the rainy and in the late seasons (terminal drought situation) in a humid zone of Nigeria. Data were collected on shoot biomass and seed yield and on leaf tissue concentrations of chlorophyll a and b and water soluble (non-structural) carbohydrate in the maize...
November 2006
Gravitropism of loblolly pine (Pinus taeda ) radicles after chemical sterilization of seeds
Certain types of chemicals can affect the gravitropism of roots. In a laboratory study, intact loblolly pine (Pinus taeda L.) radicles (emerged from H2O2-treated seeds) exhibited positive gravitropism 8 h after horizontal placement in sterile conditions. The growth angle decreased from almost horizontal (85°) to 21° within one week after treatment (90° is horizontal and 0° is...
November 2006
The value of Acacia brevispica and Leucaena leucocephala seedpods as dry season supplements for calves in dry areas of Kenya
Two experiments were conducted to evaluate the feed value of Acacia (Acacia brevispica) andLeucaena (Leucaena leucocephala seedpods (whole fruit) during the dry season. In Experiment 1, treatment diets were Rhodes grass (Chloris gayana) hay (control) and the hay supplemented with either Acacia or Leucaena seedpod meal. In Experiment 2, maasai lovegrass (Eragrostis superba) hay (control)...
November 2006
Survey of plant-parasitic nematodes associated with yams in edo, Ekiti and Oyo states of Nigeria.
A survey was conducted to determine the types, frequency and population of plant parasitic nematodes associated with the soils and roots of Yam (Dioscorea spp.) in all Local Government Areas of Edo, Ekiti and Oyo States of Nigeria using random sampling for soil and root and using pie pan modification of Baerman funnel for plant parasitic nematode extraction. Twelve, eleven and ten genera of plant parasitic...
November 2006
Indeginous knowledge systems in sustainable utilization of wetlands in communal areas of Zimbabwe: case of Hwedza District
The purpose of this research was to investigate how Indigenous Knowledge Systems (IKS) has helped in the sustainable management of wetlands in Mukondwa ward of Hwedza District in Zimbabwe. The wetlands are found in patches of about 2-3 square km per patch and accommodating an average of 15 households and are managed as a community asset. A descriptive survey was used and a structured questionnaire was administered to...
November 2006
Inter-population variation of chromosome and RAPD markers of Suaeda nudiflora (Willd.) Moq. a mangrove species in India
Inter-population genetic diversity in Suaeda nudiflora, a mangrove, was investigated through RAPD and chromosome analysis among five Indian populations. Somatic chromosome numbers 2n=36 reported for the first time in population (Pop) I and Pop-II whereas in Pop-III, 2n=36 and 40 chromosomes. Pop-IV showed 2n=54 numbers from high saline environment while Pop-V showed 2n=40 chromosomes. 102 RAPD bands were...
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