Browsing by Author "Malgwi, M.M."

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    Chromosome behaviour in Gynandropsis gynandra (Linn)
    (Department of Plant Science and Biotechnology, Nasarawa State University, Keffi., 2007-03-05) Isa, Hauwa'u; Aliyu, Tukur Nafisatu; Malgwi, M.M.
    In this research a local species, Gynandropsis gynandra was investigated cytologically with respect to its chromosomal status. It was found to have a haploid number n — 9. the species is therefore essentially a tetraploid with 4n — 36. Chiasmata frequency per bivalent was analyzed at diplotene and diakinesis; the chiasmata frequency was low at diplotene. The reason for failure of pairing amongst pairable chromosome mates was assumed to be as a result of genetic dissimilarity of individual chromosomes. Cases of unpaired chromosome segments at pachytene may probably be due to the fact that these regions were non-homologous or lack adequate time to complete the pairing or the regions might have lied farthest apart from the point at which pairing was initiated.
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    CYTOLOGICAL STUDIES OF CLEOME GYNANDRA (LINN)
    (Department of Plant Science and Biotechnology, Nasarawa State University, Keffi., 2008-03-12) Isa, Hauwa'u; Aliyu, Tukur Nafisatu; Malgwi, M.M.
    Cleome gynandra was investigated cytologically with respect to its chromosomal status. It was found to have a haploid number n = 9. The species is essentially a tetraploid with 4n = 36. Chiasmata frequency per bivalent was analyzed at diplotene and diakinesis; the chiasmata frequency was moderate at diplotene. The reason for failure of pairing amongst pairable chromosome mates was assumed to be as a result of genetic dissimilarity of individual chromosomes. Cases of unpaired chromosome segments at pachytene may probably be due to the fact that these regions were non-homologous or lacked adequate time to complete the pairing or the regions might be lying farthest apart from the point at which pairing was initiated.
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    POLLEN FERTILITY IN GYNANDROPSIS GYNANDRA (LINN.)
    (Department of Plant Science and Biotechnology, Nasarawa State University, Keffi., 2008-06-03) Isa, Hauwa'u; Aliyu, Tukur Nafisatu; Malgwi, M.M.
    In this research a local species, Gynandropsis gynandra was investigated cytologically with respect to its pollen fertility. The researchers analyses one thousand and fifty pollen grains out of which 325 were found to be morphologically sterile (31.0%) and 725 (69.0%) were morphologically fertile. Although the study reveals a high percentage of fertile pollen, not all the pollens may be viable as other studies have earlier revealed that nearly half of the morphologically fertile pollens were non viable. Hence the need for further research on pollen viability to establish the degree of fertility of the plant in question.