Evaluation of Flower Yield, Seed Production and Effect of Time on the Genetic Recombination of Sweetpotato Parents in the Rainforest Agro-Eco-Zone of Umudike Southeastern Nigeria

International Journal of Agriculture & Environmental Science
© 2019 by SSRG - IJAES Journal
Volume 6 Issue 3
Year of Publication : 2019
Authors : I.I. M. Nwankwo, E..C. Opara, , O.K.. Akinbo, C.P. Obasi & T.C. Njoku
How to Cite?

I.I. M. Nwankwo, E..C. Opara, , O.K.. Akinbo, C.P. Obasi & T.C. Njoku, "Evaluation of Flower Yield, Seed Production and Effect of Time on the Genetic Recombination of Sweetpotato Parents in the Rainforest Agro-Eco-Zone of Umudike Southeastern Nigeria," SSRG International Journal of Agriculture & Environmental Science, vol. 6,  no. 3, pp. 7-13, 2019. Crossref, https://doi.org/10.14445/23942568/IJAES-V6I3P102


A hybridization experiment was conducted at the National Root Crops Research Institute, Umudike, Nigeria with the aim to select : parents that are high flowering, parents with high compatibility, parents with high number of good seeds and to know the best time for genetic recombination. The treatment consisted of 14 parents. Seven of the parents were planted each in a plot at a planting space of 30cm by 100cm within plants and inter row spacing. There were spacing of 1.0m between plots, giving a plant population of 30 plants per plot and laid out in a randomized complete block design replicated three times. The other seven parents were maintained in different plots for pollen collection. Data were collected from 3.0pm to 5.0pm for emerged flowers which were counted and recorded, number of flowers covered, number of flowers pollinated, number of capsules formed, number of flowers aborted, number of seeds obtained from crosses, number of good seeds, number of unfilled seeds and percentage of good seeds. Data collected were statistically analyzed using ANOVA while means separation was done using LSD at 5% probability. Results obtained showed that the variety Tio-joe gave the highest flower production of 2334. The relatively high number of capsules of 347obtained from the cross between UMUSPO/3 and NRSP/2 indicated high compatibility between the two parents suggesting that the two parents could be used for further recombination. The seedling progenies resulting from the good seeds produces a remixing or reshuffling of genetic material and phenotype variability on which selection could be based. Time of pollen fertility and stigma receptivity in sweetpotato plants was highest between the hours of 7.00 to 9.00am. Families with heavier seeds weights have more energy reserves for germination and seedling growth and produce larger, more established seedlings after germination


Parents, recombination, flowers, time and seeds.


[1] Adebola P.O., Shegro A., Laurie S.M., Zulu L.N. and Pillay M. (2013) Genotype × environment interaction and yield stability estimate of some sweetpotato [Ipomoea batatas (L.) Lam] breeding lines in South Africa. J. Plant Breed. Crop Sci. 5: 182–186.
[2] Arunachalam, V. 1981. Genetic divergence in plant breeding. Indian Journalof Genetics and Plant Breeding, 14(2): 226-236.
[3] Black R. (2003) Micronutrient deficiency: An underlying cause of morbidity and mortality. Bull. World Health Organ. 81: 79.
[4] Cervantes-Flores J.C., Yencho G.C., Kriegner A., Pecota K.V., Faulk M.A., Mwanga R.O.M. and Sosinski B. (2008a) Development of a genetic linkage map and identification of homologous linkage groups in sweetpotato using multiple-dose AFLP markers. Mol. Breed. 21: 511– 532.
[5] Chang K., Lo H., Lai Y., Yao P., Lin K. and Hwang S. (2009) Identification of quantitative trait loci associated with yield- related traits in sweet potato (Ipomoea batatas). Bot. Stud. 50: 43–55.
[6] FAOSTAT (2012) Food and Agricultural Organization of the United Nations, Production statistics (http://faostat.fao.org/) Accessed August 2013.
[7] Gasura, E,. Mashingaidze,A.B., Mukasa, S.B. (2008).Genetic variability for tuber yield, quality and virus disease complex traits in Uganda sweetpotato germplasm. African Crop Science Journal, vol. 16 no 2, pp147 - 160.
[8] Grüneberg W.J., Manrique K., Zhang D. and Hermann M. (2005) Genotype × environment interactions for a diverse set of sweetpotato clones evaluated across varying ecogeographic conditions in Peru. Crop Sci. 45: 2160–2171.
[9] Gurmu F., Hussein S. and Laing M. (2013) Self- and cross-incompatibilities in sweetpotato and their implications on breeding. Aust. J. Crop Sci. 7: 2074–2078.
[10] Jones A., Dukes P.D. and Schalk J.M. (1987) Sweetpotato breeding. In: Breeding vegetable Crops. AVI Pub Co.
[11] Kana, R.K and Gothwal, D.K (2018). Genetic variability in Lentil seedlings under salinity stress. (M.Sc. Thesis presented to the Department of Plant Breeding and Genetics at Swami Keshwanand Rajasthan Agricultural University, Bikaner Rajasthan, India.
[12] Lin, S.C. and Yuan, L.P. 1980. Genetic divergence in plant breeding. Indian Journal of Genetics and Plant Breeding, 14(2): 226-236.
[13] Low J.W., Arimond M., Osman N., Cunguara B., Zano F. and Tschirley D. (2007) A food-based approach introducing orange-fleshed sweetpotatoes increased vitamin A intake and serum retinol concentrations in young children in rural Mozambique. J. Nutr. 137: 1320–1327.
[14] Luka M. W (2012). CloneSelector 3.0 Users guide Sweetpotato, CIP, Nairobi, 16 July,2012 P4
[15] Nwankwo, I.I.M (2012). Performance Of Introduced and Locally Bred Orange Fleshed Sweet potato Varieties in the Rainforest Ecology of Southeastern Nigeria International Journal of Applied Research and Technology; Published by Esxon Publishers 2 (6): 48 - 54.
[16] Nwankwo, I. I. M (2015). Evaluation of sweet potato seedlings for growth pattern and susceptibility to major leaf diseases of sweet potatoes, Journal of Agricultural and Crop Research Vol. 3(5), pp. 73-79, August 2015 ISSN: 2384-731X .
[17] Oleghe, P.E (1998). Production and management of gum arabic in the Sudan and Sahelian zones of Nigeria. J. of Arid Agriculture. 1(2) 257- 266.
[18] Sharrma, A.K (1980). The Principles and Practice of plant breeding. Oxford University press. New Delhi.IPSIO. p345
[19] Woolfe J.A. (1992) Sweetpotato—an untapped food resource. Cambridge University Press, New York
[20] Yada B., Tukamuhabwa P., Villordon A., Alajo A. and Mwanga R.O.M. (2010a) An on-line database of sweetpotato germplasm collection in Uganda. HortScience 45: 153.