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    Allelopathic effect of pentaclethra macrophylla benth. leaf extracts on germination and seedling growth of maize and okra
    (2020) Ogbu, J.U.; Awodoyin, R.O.; Olubode, O.S.
    Pentaclethra macrophylla Benth. is an indigenous leguminous tree of southern Nigeria's agroecosystems, whose seeds are used as spices; however, its allelopathy potential is not understood. Therefore, this study was aimed at investigating P. macrophylla allelopathic effects on germination and seedling growth of maize and okra. Materials and Methods: Allelopathic effects of Aqueous Leaf Extracts (ALE) of P. macrophylla at 0 (control), 10, 20, 40 and 80% concentrations on maize (n = 200) and okra (n = 200) seed germination and seedling growth were assessed in laboratory and screen house nursery. Total germination (%) for both crops was determined at one Week After Sowing (WAS); while Number of Leaves (NL), Plant Height(PH) (cm), Root Length (RL) (cm) and Dry Weight (DW) (g) were evaluated at 8 WAS. Experimental design used in the study was completely randomized design. Data were analyzed using descriptive statistics and ANOVA at a0.05. Results: Above 90.0% germination was recorded for maize in all the ALE concentrations, while for okra ALE-10 gave significantly highest germination (90.0±8.7%) and ALE-80 gave least (42.5±26.3%). Maize and okra seedlings given ALE-40 had highest NL, PH and DW;* while ALE-0 (control) had least values in PH and DW, respectively. Control had highest RL in both crops. The ALE-10 gave least RL in maize and ALE-20 gave least RL in okra. Conclusion: Pentaclethra macrophylla aqueous leaf extract at 10% enhanced germination, while 40% concentration encouraged dry matter accumulation and height in maize and okra seedlings.
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    Response of vigna unguiculata.(L.) Walp. and amaranthus cruentus (L.) Thell to interference from acalypha segetalis mull arg. on marginal lands in southwestern Nigeria
    (2001) Ogunyem, S.; Awodoyin, R. O; Osunkoya, O.O; Olubode, O.S.; Wewe, O.F.
    The role of each weeds depends on weed type, density and duration of association with the crop as well as competitive ability of the crop. In open garden experiments, the phenology of Acalypha segetalis, a common weed of arable and ruderal habitats in south western Nigeria, and its influence on the growth and performance of Vigna unguiculata and Amaranthus cruentus, were investigated in 1999 and 2000. Acalypha segetalis was found to be slow growing in the first four weeks of its life cycle but developed rapidly and vigorously afterwords. It produced and shed seeds within 10 weeks of growth. Vigna unguiculata, which is highly susceptible to weed infestation in the first four weeks of growth, did not suffer significant growth and yield reductions from the association with j4 ca/yp/ia segetalis. However, Amaranthus cruentus, which has similar growth habits with the weed, suffered significant reductions in growth and yield. Amaranthus suffered up to 42% marketable yield loss when grown with Acalypha. The early slow growth of Acalypha determines its competitive potential in arable cropping systems. Crops that establish fast and with superior early growth ability may not suffer adverse competitive repression with the weed.
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    Management of foliar and soilborne pathogens of cowpea (Vigna unguiculata L. walp) with two garlic varities (Allium Sativum A.Linn)
    (Academic Journals, 2014) Peluola, C. O; Fadina, O.O
    White and pink garlic extracts were tested for their antifungal potentials on mycelial radial growth, spores and sclerotial production of Macrophomina phaseolina (Tassi) Goid, Colletotrichum destructivum O gara and Colletotrichum capsici (Syd) Butter and Bisby pathogens of cowpea in vitro. Water or ethanol extracts of common pink and common white garlic varieties were tested at a concentration of 250 ppm while sterile distilled water served as control. In vivo study was based on white garlic extracted alone at 0.50 and 100% concentrations on M.phaseolina and C.capsici. Data were subjected to ANOVA and means was separated at P=0.05. Water extracted white garlic gave over 90% inhibitions of mycelial growth of M. Phaseolina and gave higher inhibitions than water or ethanolic pink garlic extracts on all the three pathogens. It is not significantly lower P=0.05 than conventional fungicide benomyl at 0.05 gai/kg. However, in vivo result was phytotoxic to cowpea seeds at 100% concentration and pathogrn control at 50% garlic extract. In contrast, cowpea variety IT84S-2246-4 seed germination was 77% when treated with M.phaseolina and 100% with C.capsici but reduced pathogen control at 50% garlic extract
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    A somatic embryogenesis-based system for the production of fluted pumpkin (telfairia occidentalis hook F.) planting materials
    (The Society for In Vitro Biology, 2015) Awosika, D. O.; Uchendu, E.; Balogun, M. O.; Adetimirin, V. O.
    Fluted pumpkin (Telfairia occidentalis Hook. f.) is traditionally propagated by seeds, which have low viability after pod harvest, low percentage germination, and poor root development and often germinate during storage. The competition between use of seeds for consumption and propagation causes scarcity of propagules, necessitating development of more efficient propagation systems. Efficient protocols were developed for the induction of somatic embryos (SEs) and conversion into plantlets using cotyledons from mature zygotic embryos. This study evaluated the effects of 2,4- dichlorophenoxyacetic acid (2,4-D) and kinetin (25 combinations) on the induction of SEs, and of indole-3-acetic acid (IAA), 2,4-D, and kinetin (7 combinations) on conversion of SEs into plantlets. Significantly more SEs (381.7; p<0.01) were obtained on medium with 0.5 mg l−1 2,4-D and 0.1 mg l−1 kinetin than from the other 24 treatments after 4 wk of cotyledon culture. All SEs were obtained through an intermediary callus. For the production of SE-derived plantlets, treatments with 0.01 mg l−1 IAA and 0.02 mg l−1 kinetin resulted in significantly more shoots and roots than other treatments (p<0.001 for each) and gave 100% conversion of SEs to plantlets. The mean numbers of roots and shoots on this treatment were 3.7 and 1.3, respectively, and the mean shoot length was 2.2 cm. The plantlets had broad leaves and good vigor, similar to the parent cultivar. Nearly all plantlets (98–100%) survived acclimatization. The production of SEs from cotyledons and the high rate of conversion into quality plants will allow development of a mass production system for Telfairia planting material to meet the increasing demand for this crop.
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    A somatic embryogenesis-based system for the production of fluted pumpkin (telfairia occidentalis hook F.) planting materials
    (The Society for In Vitro Biology, 2015) Awosika, D. O.; Uchendu, E.; Balogun, M. O.; Adetimirin, V. O.
    Fluted pumpkin (Telfairia occidentalis Hook. f.) is traditionally propagated by seeds, which have low viability after pod harvest, low percentage germination, and poor root development and often germinate during storage. The competition between use of seeds for consumption and propagation causes scarcity of propagules, necessitating development of more efficient propagation systems. Efficient protocols were developed for the induction of somatic embryos (SEs) and conversion into plantlets using cotyledons from mature zygotic embryos. This study evaluated the effects of 2,4- dichlorophenoxyacetic acid (2,4-D) and kinetin (25 combinations) on the induction of SEs, and of indole-3-acetic acid (IAA), 2,4-D, and kinetin (7 combinations) on conversion of SEs into plantlets. Significantly more SEs (381.7; p<0.01) were obtained on medium with 0.5 mg l−1 2,4-D and 0.1 mg l−1 kinetin than from the other 24 treatments after 4 wk of cotyledon culture. All SEs were obtained through an intermediary callus. For the production of SE-derived plantlets, treatments with 0.01 mg l−1 IAA and 0.02 mg l−1 kinetin resulted in significantly more shoots and roots than other treatments (p<0.001 for each) and gave 100% conversion of SEs to plantlets. The mean numbers of roots and shoots on this treatment were 3.7 and 1.3, respectively, and the mean shoot length was 2.2 cm. The plantlets had broad leaves and good vigor, similar to the parent cultivar. Nearly all plantlets (98–100%) survived acclimatization. The production of SEs from cotyledons and the high rate of conversion into quality plants will allow development of a mass production system for Telfairia planting material to meet the increasing demand for this crop.