It is free from soy, corn, gluten, yeast, wheat, starch, milk, egg, and preservatives. Screening for resistance mechanisms in cowpea genotypes on. Below ground, bright orange stems are attached to host. Pdf alectra vogelii, a threat to bambara groundnut production. Alectra vogelii, a threat to bambara groundnut production in singida and dodoma regions, tanzania article pdf available january 2016 with 296 reads how we measure reads. As flowering specimens are very leafy and with a similar habit to many freeliving plants. The production of toxic compounds by the parasite has been suggested. Parasitic weeds of the families orobanchaceae aeginetia, orobanche, broomrape and scrophulariaceae alectra, striga, witchweed are considered to be among the most serious agricultural pests of economic importance in many parts of the world. All structured data from the file and property namespaces is available under the creative commons cc0 license. In botswana, grain or fodder cultivars of pearl millet and bambara, which is not attacked by the local biotype of the parasite, are potent stimulators of a. Apr 08, 2020 alectra vogelii is a root parasitic weed mainly on economically important leguminous crops in a large part of the african continent. Pdf alectra vogelii, a threat to bambara groundnut.
Stems hairy, single or branching near soil level, leafy when flowering resembling free living plants, bright orange stems. Cytotoxic constituents of alectra and striga species, weed. Material science and metallurgy by kodgire pdf scoop. Ajps american journal of plant sciences 21582742 scientific research publishing 10. Jul 03, 2018 triangulos rectangulos notables download as word doc. Aug 01, 2004 summary decimation of cereal growth and yields by hemiparasitic striga species cannot be accounted for entirely by the removal of host. Mumba 2 basic sciences department, lilongwe university of agriculture and natural resources, lilongwe, malawi crop and. Germination stimulants produced by vigna unguiculata walp cv.
Alectra incorporated, through its subsidiary alectra utilities corporation, is an electricity utility and distributor that serves several municipalities in the golden horseshoe region of ontario. As flowering specimens are very leafy and with a similar habit to many free living plants, people who are not familiar with root hemiparasites are unlikely to recognize that a. Proton nmr and hrlcms based phytochemical analysis of. Progress on management of parasitic weeds abuelgasim elzein. Pdf current approaches to alectra vogelii control in cowpea. The cowpea lines b301, it03k3381 and it99k57321 were consistently free of emerged striga and alectra shoots in both years while it98k10921 and it97k2058 were resistant to striga but supported some emerged alectra shoots. Comparative responses of cowpea breeding lines to striga and. Pdf nature of resistance of cowpea alectra vogelii infestation. Also, the alectra infested genotypes recorded significantly more crop damaged syndrome score compared with the resistant genotypes which were healthier. Independent inheritance of striga and alectra resistance in. Trapcrops produce the alectra germination stimulant in their root exudates but are not susceptible to attack by the parasite seedlings.
Preparation of agar plates growth and check of bacterial strains. Pdf nature of resistance of cowpea alectra vogelii. Nature of resistance of cowpea alectra vogelii infestation. All previous and subsequent major floras for west africa hutchinson and. Alectra vogelii benth is parasitic weed which causes significant yield reductions in cowpea vigna unguiculatawalp in africa. Everything you ever wanted to know about agaragar one. Screening of cowpea genotypes for their reactions to alectra vogelii benth. Nature of resistance of cowpea alectra vogelii infestation article pdf available in african crop science journal 244. Alectra vogelii has been the major constraint known to attack leguminous species especially to cowpea production. The use of liquid allows large quantities of bacteria to be harvested but does not permit easy selection or determination of phenotype of single cells.
Screening of cowpea genotypes for their reactions to alectra. Response of alectra vogelii benth to different crop root exudates. Jan 08, 2019 bte datasheet pdf 4q triac nxp semiconductors. Host crops are largely associated with freedraining sands and sandy. Field trials were conducted over three years at samaru in the northern guinea savannah ecological zone of nigeria to evaluate the performance of 20 improved cowpea varieties under conditions of natural infestation by a parasitic weed, alectra vogelii benth. Agar has no calories, no sugar, no carbs, and no fat. Benth is a parasitic weed in the family scrophulariaceae that causes substantial damage by attaching onto the cowpea, vigna unguiculata l. An investigation of three species of the economically important striga and the related alectra vogelii has now resulted in the isolation of eight iridoid glucosides. It may be concluded from this investigation that it97k49935, it98k57311, it03k3381, it98k2058 and uam 11d24553 that were found to be resistant to alectra infestation which gave relatively higher grain yields are recommended for.
Total numbers of 31 teachers were used in this study. In africa, striga negatively affects the lives of over 100 million people, implying that these parasitic weeds are among the most important constraints to agricultural development in this region mboob, 1999. Jun 02, 2019 alectra vogelii is a root parasitic weed mainly on economically important leguminous crops in a large part of the african continent. Release of cowpea line it99k4946 for yield and resistance to the parasitic weed, alectra vogelii benth, in malawi.
Objection to the application from lilongwe university of. Sep 07, 2014 this page was last edited on 17 december 2019, at 20. There is therefore an urgent need to identify alectraresistant genotypes, possessing farmers desired traits, in cowpea germplasm in burkina faso. A germination stimulant, alectrol, for the seeds of the angiospermous root parasites alectra vogelii benth.
The objective of this study was to identify the type of gene action controlling the trait for resistance to alectra vogelii in cowpea and estimate the heritability of the trait. Pdf alectra vogelii benth is parasitic weed which causes significant yield reductions in. May 05, 2020 ear and hearing4, useful links wits prospectus pdf undergraduate estatuto basico del empleado publico pdf actualizado ron paul farewell speech pdf invariant based automatic testing of modern web applications pdf algorithms in java pdf robert sedgewick panasonic wvlw pdf excel to pdf converter in excel barrons sat subject test math pdf water. Global invasive potential of 10 parasitic witchweeds and related. Weed risk assessment for alectra vogelii yellow witchweed ver.
Files are available under licenses specified on their description page. Identification of sources of resistance to alectra vogelii in. Crop science abstract inheritance of alectra resistance in. Cowpea was grown in pots containing 50, 2700 or 4000 a. Hence, the objective of the experiment was the identification of phylogenetically differences and differential responses of a. Alectra is a genus of flowering plants in the family orobanchaceae. Field trials were conducted in 1999 and 2000 to investigate the effect of striga gesnerioides and alectra vogelii on the grain mineral elements concentration of. Hostparasite relations between cowpea and alectra vogelii. Abstract the aim of this research was to find out the importance of improvisation in teaching biology in senior secondary school students in sokoto metropolis. Jun 01, 2002 summary although the angiospermous parasitic weed alectra vogelii is a major biotic constraint to cowpea production in africa, there is little information on the host. Vatke has been isolated from root exudates of its genuine host plant vigna unguiculata walp cv saunders upright. The parasitic angiosperm genera aeginetia, alectra, orobanche.
Alectra vogeliibenth is parasitic weed which causes significant yield reductions in cowpea. Current approaches to alectra vogelii control in cowpea. Nov 23, 2018 in burkina faso, cowpea serves as both a food and cash crop generating significant income for stakeholders. Pdf on jan 10, 2016, ernest mbega and others published alectra vogelii, a threat to bambara groundnut production in singida and dodoma regions, tanzania find, read and cite all the research. Alectra vogelii is an annual parasitic herb with a wide host range, and it attacks economically important leguminous crops such as glycine max soybean, vigna unguiculata. Cowpea is one of the most important food legumes and is widely adapted to semiarid environments in africa. Bacteria can be propagated on liquid or solid media. Parasitic angiosperm alectra vogelii benth is a growing problem in malawi, particularly.
The aim of the study was to evaluate the effect of root exudates from cowpea, groundnut, maize, sorghum and pearl millet genotypes on the germination. Progress on management of parasitic weeds abuelgasim elzein and jurgen kroschel. Inheritance of alectra resistance in cowpea genotype b 301. Alectra vogelii benth and striga gesnerioides, both of the family orobanchaceae, which.
Alectra vogelii is a parasitic weed found in major leguminous crops, including chickpea, cowpea. It is a municipally owned corporation with shares in varying amounts held by the municipalities which owned its predecessor companies. Several sources of resistance have been identified, including b 301, a landrace from botswana that has shown complete resistance to both striga and alectra. The most commonly sought after traits were large sized seeds 17%, resistance to alectra and producing high yields both 15. Each daughter cell will then divide into two daughter cells and when this continuous division takes place on solid media, all of these identical cells will begin to form a colony on the medium consisting of identical cells.
Alectra vogelii pdf alectra vogelii has been the major constraint known to attack leguminous species especially to cowpea production. Parasitic angiosperm alectra vogelii benth is a growing problem in malawi, particularly with current emphasis on legumes. The product does not contain any of the restricted substances in concentrations and applications banned by the directive, and for components, the product is capable of being worked on at the higher temperatures required by lead free soldering the restricted. Pdf response of alectra vogelii benth to different crop. Response of cowpea genotypes to alectra vogelii parasitism in kenya. Recently, two parasitic weeds, striga striga gesnerioides willd. Alectra vogelii is a root parasitic weed mainly on economically important leguminous crops in a large part of the african continent.
Striga gesnerioides and alectra vogelii, the latter being important in eastern and southern parts of africa. Other lines supported varying numbers of emerged striga and alectra shoots. However, cowpea production is seriously hampered by several constraints among which is the parasitic weed alectra vogelii. Treatment of initial hydroalcoholic extract with lead acetate made the final mf free from tannins. Awareness of the parasitic weed alectra vogelii benth. Pdf effect of alectra vogelii and striga gesnerioides infestations on. Pdf response of alectra vogelii benth to different crop root. The compound is more active than strigol in stimulating. Stems hairy, single or branching near soil level, leafy when flowering resembling free living plants, bright orange stems attached to host roots. The assimilation of aspartic and glutamic acids by the root. The genera alectra comprises 34 species alectra alectroides s. Jun 29, 2019 composicion quimica del aguacate hass pdf. Host crops are largely associated with freedraining sands and sandy loams.
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