Journal Articles

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Journal Articles (Department of Plant and Science)

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    Interrelationships between Pratylenchus brachyurus and Helicotylenchus pseudorobustus in Sugarcane
    (Faculty of Agriculture, University of Ife, 1982) Onapitan, J. A.; Amosu, J. O.
    Greenhouse studies showed that Pratylenchus brachyurus and Helicotylenchus pseudorobustus singly and in all combinations tested, did not significantly suppress both top growth and root development of sugarcane. Data on mean population increase, showed that P. brachyurus multiplied faster than H. pseudorobustus singly and in all combinations, and had suppressive effect on the reproduction of H. pseudorobustus.
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    A Note on the Heritability of Pod Length and Number of Seeds per Pod in Cowpea, Vigna unguiculata s.sp. unguicalata (L) Walp
    (Faculty of Agriculture, University of Ife, 1982) Ogunbodede, B. A.; Fatunla, T.
    KR 91, (a short podded cowpea cultivar) was crossed to Paraquay No. 2, (a long podded cultivar), while Victor (a crowder) was crossed with B33 (a non-crowder) to study the inheritance of pod length and seed number respectively in the two crosses. The two parents, PI, P2, and the progenies F1, BC1, BC2 and F2 of each cross were evaluated at the University of Ife Teaching and Research Farm. Narrow sense heritability estimates of 72.1% and 36.8% were obtained for pod length and number of seeds per pod respectively. About seven and eight pairs of genes control pod length and number of seeds per pod respectively.
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    Variability in Reaction of Ife Brown (Irawo) to the Cowpea Aphid-borne Mosaic Virus
    (Faculty of Agriculture, University of Ife, 1982) Fatunla, T.; Ladipo, J. L.
    Cowpea (Vigna unpiculata ssp. unguiculata) (L.) Walp. cv. Ife Brown showed genetic variability for resistance to cowpea aphid-borne mosaic virus. It was shown that Alabunch and Westbred, two Ife Brown parents, carry resistance genes to the virus in their populations. Two generations of individual plant selection in Ife Brown resulted in the production of four true breeding lines resistant to the cowpea aphid-borne mosaic virus.
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    A Proposed Procedure for Rapid Development of Inbred Lines for the Production of Hybrid Maize in Nigeria
    (Faculty of Agriculture, University of Ife, 1982) Fakorede, M. A. B.
    A procedure is described for the rapid development of inbred lines to be used as parents of high-yielding hybrid cultivars of maize (Zea mays L.). This procedure involves the production of S1 lines from three unrelated populations A, B, C whose Fl hybrids are known a priori to demonstrate significant yield heterosis. The S, lines are evaluated per se and S2 lines obtained from the best performing 5 or more S1 lines from a population are intercrossed with those-from the other populations to give 75 or more S2 x S2 crosses. The S2 x S2 crosses are evaluated with check cultivars (e.g. cultivar hybrids, the best widely grown cultivar and single-cross hybrids, if available) and the top 5 are selected for the National Zonal Maize Yield Trials (NZMYT) coordinated by the National Cereals Research Institute (NCRI), Ibadan. S4 x S4 hybrids of these top 5 selections are evaluated in the NZMYT as well as several other locations available to the researcher and inbred lines of the best 1 or 2 hybrids are released as parent materials. The advantages of this procedure include (i) simultaneous inbreeding and evaluation trials, (ii) flexibility for concurrent population improvement and extraction of inbredlines, and (iii) with two rainfed cropping seasons and an off-season with irrigation facilities, near-homozygous inbred lines (F 0.99) can be obtained within 3 calendar years.
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    Partitioning of Dry Matter in Relation to Yield Performance in Five Cultivars of Cowpea, Vigna unguiculata s. sp. unguiculata
    (Faculty of Agriculture, University of Ife, 1982) Alofe, C. O.; Amusan, A. A.
    Dry matter accumulation (DMA) and its pattern of partitioning were studied in five cultivars of cowpea, Vigna unguiculata ssp. Unguiculata (L.) Walp. Generally, TVx 183P9G and TVx 1193-9F flowered and podded earliest while TVu 1190E and Tvu 1977 were the slowest to flower and pod; Ife Brown was intermediate. TVu 1977 and TVu 1190E accumulated more dry matter in their stems, leaves and pods than any of the other cultivars. The proportion of dry matter deployed into pods was highest in TVx 1836-9G (81 percent) and TVx 1193-9F (75 percent), and least in TVu 1190E and TVu 1977 (63 and 67 percent each). In Ife Brown, it was 67 percent. Grain yields were similar in TVu 1977, TVu 1190E and TVx 1836-9G (505, 528 and 516 kgha respectively), but only 3 59 kgha in Ife Brown. I t was 472 kgha in TVx 1193-9F. Harvest index was low in TVu 1190E and TVu 1977 (18 and 20 percent, respectively), medium in Ife Brown (23 percent) and high in TVx 1836-9G and TVx 1193-9F (30 and 26 percent respectively). Correlation between seed yield and DMA though positive, was not significant. No correlation was observed between seed yield and harvest index, but correlation between DMA and harvest index was negative and significant.