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1.
Inheritance and linkage relationships of pearl millet seed esterase isozymes were studied using; polyacrylamide dise: gel electrophoresis and α-naphthyl acetate as substrate. The Zone of enzyme activity was resolved into five bands. The presence of a band showed complete dominance over its absence. Each one of the bands (1 to 4) was under the control of a single gene. Band five was found to be controlled by three independent loci with duplicate gent action Loci for Est1, Est3 and Est4 Were found to be linked. Est2 Was independent of this linkage group. 相似文献
2.
Diatta Cyril Tovignan Thierry Klanvi Akata Eyanawa Atchozou Ifie Beatrice Elohor Sarr Mame P. Bassene César Aidara Ousmane Ndione Pierre Alfred Gackou Malick Manga Anicet Georges Bruno Danquah Eric Yirenkyi Offei Samuel Kwame Cisse Ndiaga 《Journal of Crop Science and Biotechnology》2022,25(2):149-160
Journal of Crop Science and Biotechnology - Increasing sorghum production per unit area in the farmer’s field by developing high yielding tannin-free and grain mold tolerant varieties in... 相似文献
3.
Ten multipurpose tree species were planted both in monoculture and intercropped withArachis hypogea (groundnut) in a randomized complete block with three replications. The vigrou, biomass, nutrient content, and coppicing percentage of the trees were evaluated. Intercropping with groundnuts during the establishment phase did not affect subsequent growth and development of the species.Acacia mangium, Acacia auriculiformis, Cassia siamea, Calliandra calothyrsus andParaserianthes falcataria established well, when compared toGliricidia sepium, Leucaena leucocephala, Dialum guineense, Dubocia macrocarpa andMilicia excelsa. A. mangium, A. auriculiformis, C. calothyrsus, C. siamea andP. falcataria produced the highest leaf (4 to 20 t ha–1) and wood (12 to 37 t ha–1) biomass yield (primary growth) at one to three years after planting. Coppicing percentage ofA. mangium A. auriculiformis andP. falcataria were relatively low (35 to 50%).C. calothyrsus andC. siamea showed the highest coppicing percentage (95 to 100%) and produced the greatest coppice biomass (9 to 13 t ha–1). Total nitrogen and organic matter percentage of soils from under the stands of these two species were also significantly higher than that of the rest. The two species may thus be considered for use in agroforestry technologies for soil improvement on acid soils, which are typical of the moist tropics. 相似文献
4.
Amphitheater-headed canyons have been used as diagnostic indicators of erosion by groundwater seepage, which has important implications for landscape evolution on Earth and astrobiology on Mars. Of perhaps any canyon studied, Box Canyon, Idaho, most strongly meets the proposed morphologic criteria for groundwater sapping because it is incised into a basaltic plain with no drainage network upstream, and approximately 10 cubic meters per second of seepage emanates from its vertical headwall. However, sediment transport constraints, 4He and 14C dates, plunge pools, and scoured rock indicate that a megaflood (greater than 220 cubic meters per second) carved the canyon about 45,000 years ago. These results add to a growing recognition of Quaternary catastrophic flooding in the American northwest, and may imply that similar features on Mars also formed by floods rather than seepage erosion. 相似文献
5.
Manga Essouma François Michel Isabelle Mala William A. Levang Patrice Ambang Zachée Begoude Boyogueno Aimé D. Moisy Charlotte Ngono Françoise Carriere Stéphanie M. 《Agroforestry Systems》2021,95(5):843-854
Cocoa is a major crop and income source for most farmers and rural households in the Centre, South and South-West regions of Cameroon, where cocoa is generally produced in agroforestry systems. In this country, cocoa-based agroforestry systems (CBAFS) are undergoing multiple changes alongside the rapid changes underway in the natural, economic and socio-political conditions. This study—carried out in the Akongo subregion in central Cameroon—was designed to gain insight into the CBAFS trends and dynamics in the light of those multiple changes. This semi-structured socioeconomic survey involved interviews and direct observations at plot, farm, household and village scales. Overall, forty cocoa growers from ten villages were interviewed and then fifteen cocoa plots were characterized on the basis of the survey findings. They revealed that cocoa was the major crop in this study area, with cocoa plantations occupying three quarters of the total farming area. Three types of CBAFS were identified, which differed according to their vegetation structure, management practices and age of the plantations. Dynamics affecting the structural characteristics and the spatial extension of these systems emerged and were intimately linked to the dynamics of the cocoa farmer population in relation to their context.
相似文献6.
D A Salifu T B Manga I O Onyali 《Revue d'élevage et de médecine vétérinaire des pays tropicaux》1990,43(2):193-196
Faecal samples were collected from a total of 1,000 pigs from the Port Harcourt and Jos areas of the Rivers and Plateau States, respectively, between January 1987 and March 1988. In the Jos area the parasite incidence was: Ascaris suum 53.1%, Trichuris suis 8.5%, Hyostrongylus rubidus 13.1%, Metastrongylus salmi 3.7%, Strongyloides ransomi 87.7%, Oesophagostomum dentatum 35.1% and Eimeria spp. 2.4% while in Port Harcourt the incidence rate was Ascaris suum 10.4%, Trichuris suis 47.2%, Oesophagostomum dentatum 50%, Hyostrongylus rubidus 2%, Ancylostoma duodenale 83.2% and Eimeria spp. 3.6%. The high rate of parasitic infections was due to poor management practices as shown by poor sanitary conditions. Access to human faeces, poor feeding and lack of deworming were also very evident. The different rates in the incidence of parasites in Jos and Port Harcourt areas were due to the varying moisture conditions in these states. 相似文献
7.
Two known 7,8-dihydrobenzofuranones, aquilegiolide (1) and menisdaurilide (2), were isolated from Ouratea reticulata root bark. 相似文献
8.
Summary Inheritance pattern of seven dwarf mutants revealed each of them to be controlled by a single recessive gene. Tests for allelism indicated existence of two groups of dwarfs, group 1 comprising six mutants and group 2 a single dwarf. The dwarfs of group 1 were found to be allelic to D2 of the dwarf types already known in this crop and the dwarf of group 2 was allelic to D1 of these types.Botany Department, R.V.V.N. College, Dharanikota, India. 相似文献
9.
Summary Genetics of four in vitro characters was studied using immature inflorescence-derived callus from four inbred lines. The number of genes controlling total callus quantity varied from 5–11, those for embryogenic(E) callus quantity from 4–7, for callus growth rate from 3–12 and those for regeneration frequency varied from 4–9 in the three segregating F2 populations. Callus derived from the dwarf plants (d2 d2) was phenotypically distinguishable from that of the tall accessions. The association between d2 locus and the in vitro characters was analysed using three different approaches. It is suggested that d2 locus might be closely linked to majority of the loci governing E callus production. 相似文献
10.