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Megagametogenesis and embryology of the pecan (Carya illinoensis)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.K. Haulik --- , Republic of South Africa L.C. Holtzhausen --- Department of Horticultural Science, Republic of South AfricaA timetable is presented for megasporogenesis, megagametogenesis, embryo and endosperm development of the pecan [Carya illinoensis (Wang.) K.Koch] under Transvaal Middleveld conditions. Differences between seasons and cultivars were minimal. The fertilized endosperm nucleus was observed about 5 to 7 days... -
Histological assessment of gonad maturation in Labeo parvus (Teleostei: Cyprinidae) in Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: E Montchowui --- Ecole Nationale Supérieure des Sciences et Techniques Agronomiques de Kétou, République du Bénin P Compère --- Functional and Evolutive Morphology Laboratory, Belgium M Thiry --- Laboratory of Cell and Tissue Biology, Belgium P Lalèyè --- Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, Republic of Benin J-C Philippart --- Behavioural Biology Unit, Belgium P Poncin --- Behavioural Biology Unit, BelgiumA histological analysis was undertaken on the gonad development of Labeo parvus Boulenger 1902, a medium-sized cyprinid from the Ouémé River, Benin. Samples were collected monthly between April 2006 and March 2007 and were examined using routine macroscopic and histological... -
Histological validation of gonadal macroscopic staging criteria for Labeo cylindricus (Pisces: Cyprinidae)
Item type: Journal Article • Journal: African Zoology • Authors: Anthony J. Booth --- Department of Ichthyology and Fisheries Science, South Africa Olaf L.F. Weyl --- Department of Ichthyology and Fisheries Science, South AfricaHistological examination of gametogenesis revealed that the current staging criteria used to assess gonadal recrudescence of the redeye labeo, Labeo cylindricus, were adequate. Gametogenesis was qualitatively similar to thatof freshwater teleosts with a clearly defined seasonal reproductive cycle. L. cylindricus... -
Influence of pressmud on the development of the ovary, oogenesis and the neurosecretory cells of the earthworm Eudrilus eugeniae (Kinberg)
Item type: Journal Article • Journal: African Zoology • Authors: K. Parthasarathi --- Department of Zoology, India L.S. Ranganathan --- Department of Zoology, IndiaThe histology of brain neurosecretory cells and the development of the ovary and oocytes of preclitellate, early clitellate and late clitellate stages of Eudrilus eugeniae reared in clay loam soil and pressmud have been studied. E. eugeniae reared in pressmud...