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Research Article z Available online at http://www.journalcra.com INTERNATIONAL JOURNAL OF CURRENT RESEARCH International Journal of Current Research Vol. 9, Issue, 02, pp.46562-46565, February, 2017 ISSN: 0975-833X RESEARCH ARTICLE POTENTIAL OF SOME LEGUME SEEDLINGS AS STIMULANTS TO WITCH WEED [STRIGA HERMONTHICA (DEL.) BENTH. (LAMIALES: OROBANCHACEAE)] SEED GERMINATION AND ROOT ATTACHMENT 1Evans Jimmy Kenyi, 2Abdel Gabbar El TayibBabikriand and 3,*Philip WaniMarchelo-d’Ragga 1Dr.John Garang Memorial University of Science and Technology, Bor, P.O. Box 436, Juba, South Sudan 2University of Sudan, Shambat Campus, College of Agricultural Studies, Research Centre & Soil Laboratory, Khartoum, Sudan 3University of Juba, Department of Agricultural Sciences, College of Natural Resources and Environmental Studies, P.O. Box 82 Juba, Jubek State, South Sudan ARTICLE INFO ABSTRACT Article History: A laboratory experiment was conducted at the Weed Science Laboratory of Agricultural Research Received 12th November, 2016 Corporation, Wad Medani (Sudan) in 2007. The experiment adopted the El Mubarak (1998) improvised disc Received in revised form technique. Tentatively, Striga seed germination and attachment of germinated striga seeds to roots of four legumes 23rd December, 2016 species namely, Bambara nuts, Vignasubterranea; ground nuts, Arachishypogoea; Clitoria, Clitoria spp. and Accepted 06th January, 2017 Desmondium spp) were tested and two sorghum cultivars (Wad Ahmed and ArfaGadamak) were used as checks. Published online 28th February, 2017 Results showed that, Bambara nuts, Clitoria and Desmondium spp were antagonistic and resulted in less Striga seed germination than sorghum while Ground nuts resulted in high Striga germination similar to those for the sole sorghum checks. Nevertheless, all four legume species tested resulted in less Striga attachment to roots than for Key words: sorghum. Therefore, this study recommends the use of ground nuts as a rotational crop in striga infested soils as Witchweed, Strigahermontheca, they can effectively reduce the striga seed load in the soil. Orobanchaceae (Scrophuliaceae), Legume spp., Sorghum cultivars, Improvised disc, Petri-dish Copyright©2017, Evans Jimmy Kenyi et al., This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Citation: Evans Jimmy Kenyi, Abdel Gabbar El TayibBabikriand and Philip WaniMarchelo-d’Ragga, 2017. “Potential of some legume seedlings as stimulants to witch weed [Striga hermonthica (del.) benth.(Lamiales: orobanchaceae)] seed germination and root attachment”, International Journal of Current Research, 9, (02), 46562-46565. INTRODUCTION The number of seeds per capsule is about 700 and number of capsules per plant averages 60-70 in S. hermonthica (Parker Striga is an obligate root parasite that includes 50 to 60 species and Riches, 1993). For successful host attachment, germination though only about a quarter of these parasitize crops (Joel et must take place within 3-4 mm of the host root since Striga al., 2007). It is most damaging to grain grasses and some radicles can only manage 2-4 mm (Ramaiah et al., 1991). To legumes endangering food security in many developing compensate for this biological restriction, Striga produces up countries (Parker and Riches, 1993). The name “witch weed” to 450,000 seeds per plant which persist in the soil for up to 10 given to Striga was coined from the debilitating effects it years (Eplee, 1992). Well-grown Striga plant may produce up inflicts on its host even before emergence. The genus to 500,000 seeds which under specific soil conditions may Striga(S.) has many species parasitizing many crops and weeds remain viable for 14 years (Parker and Riches, 1993). S. in different regions of similar agro-climatic zones. The most hermonthica is one among four species of economic destructive species on cereals are S. hermonthica, (Del.) Benth importance because of their impact as yield reducers (Parker S. asiatica (L.) Kuntze, S. densiflora Benth S. angustifolia and Riches, 1993). According to Joel et al. (2007), S. Sadanha and S. aspera (Willd). Of interest to this study is hermonthica has the largest geographical distribution. It S.hermonthica (Del.) Benth.Striga has tiny seeds measuring spreads in Africa between latitudes 5°N and 20°S. It is also 0.15-0.31 mm and weighs 3-15µg (Stump, 2007; Parker and found in South-East Asia. The plant is erect 50 to 100 cm high Riches, 1993). with pink flowers, five ribs on the calyx and bracts below each flower fringed with hairs. It is a parasite of a number of cereal *Corresponding author: Philip WaniMarchelo-d’Ragga, crops in Africa and Arabia and most destructive to sorghum, University of Juba, Department of Agricultural Sciences, College of (Sorghum bicolor); maize, (Zea mays L.) and millet Natural Resources and Environmental Studies, P.O. Box 82 Juba, (Pennisetumglaucum L.). Joel et al., (1995) pointed out that Jubek State, South Sudan. 46563 Evans Jimmy Kenyi et al. Potential of some legume seedlings as stimulants to witch weed [Striga hermonthica (Del.) Benth. (Lamiales: Orobanchaceae)]seed germination and root attachment Striga exhibited two main life phases: independent and rotation has the advantage to control Striga and diversify food. parasitic. The independent phase begins with seed imbibition Rotating Striga susceptible cereal crops with none susceptible and germination and lasts a few days until the germinated crops particularly false hosts had long been advocated as a parasite finds a host and attaches to it. The parasitic phase is simple way of reducing Striga seed bank in the soil. Odhiambo that during which the parasite becomes dependent on nutrients and Ransom, (1994); Carsky et al., (2000); Sauerborn et al., derived from the host and starts as soon as the haustorium (2000); Hess and Dodo (2004) demonstrated that rotations invades the host root eventually forming a physiological bridge effectively reduce Striga numbers and increase yield in between the vascular system of the host and parasite (Joel, subsequent cereal crops. Berner et al., (1995) suggested that 2000). The following are the developmental stages of the selected crops for rotations should be of high efficacy in parasite: germinating Striga seeds. Ransom (2000), Oswald and Ransom (2001) emphasized that selection of rotational crops Joel et al., (2007) observed that when seeds of Striga from a must be based on socioeconomic considerations (market value mature fruit are released, they enter a period of dormancy or and availability). Development of ready and steady market for after – ripening during which seeds complete preparation for alternative crops may have a greater impact on adoption of later germination. He suggested that this period is influenced rotations than biological effectiveness. Cowpeas of family by temperature and seems to limit germination of freshly shed Leguminoceae (Fabaceae) arehighly parasitized by Striga seeds in the field at the end of the growing season ensuring gesnerioides (Willd) Vatkewhile other Legumes are not. This germination only in the next season when host plants are able study was incepted to investigate the reaction of some legumes to support the whole life cycle of the parasite. Alternatively, with Strigaspp., in order to identify false hosts. even after being imbibed and environmentally primed for germination, when seeds failed to find a suitable host, they can MATERIALS AND METHODS re-enter a low energy dormant state or “Wet dormancy” (Vallance, 1950). This ensures seed longevity and is reversible A laboratory experiment was undertaken in 2007-2008 season with desiccation (Joel et al., 2007). A chemical stimulus is at the Weed Science Laboratory at Wad Medani in the Sudan. needed to trigger germination of root parasites (Press and In this experiment, the improvised disc technique of El Graves, 1995). Before a chemical stimulus was needed to Mubarak (1998) was adopted. About 100 glass fiber discs trigger germination of the parasite, some metabolic processes (0.5mm diameter) were placed on filter papers moistened with must occur in order for the seed to become responsive to sterilized distilled water in three glass Petri-dishes of 9 cm stimuli and germinate. Joel et al., (1995) further indicated that internal diameter. Striga seeds are conditioned after exposure to moist environment, imbibition of water and suitable temperature Experimental materials before they respond to germination stimulus in order to germinate. Conditioning lasts for 10 to 21 days within a Seeds of Striga hermontheca (Del.) Beth collected in 2006 at temperature range between 20 and 40ºC but optimum Damazin were sieved to remove trash, washed with distilled temperature is between 25 and 35ºC. After this, seeds respond water to remove dust and then dried at room temperature in the to stimuli in order to germinate. Joel, (2000) found that laboratory for two days. The seeds were then sterilized with parasitic plants of Orobanchaceae are capable to perceive the sodium hypochloride. Some of the sterilized seeds were presence of adjacent living host roots by sensing strigolactones sprinkled on the filter paper discs in each of three Petri-dishes. that are released by the plant roots even at extremely low The Petri-dishes were then covered and sealed with cellotape concentrations. Several strigolactones were found in root wrapped in aluminum foil and placed in an incubator
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