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Effects of gamma rays on reproductive traits of Vigna vexillata (L.) A. Rich.

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investigation of the morphological characterization of 15 accessions of V. vexillata, irradiated with gamma ray at 250, 300 and 350 (Gy) doses.

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Effects of gamma rays on reproductive traits of Vigna vexillata (L.) A. Rich.

  1. 1. www.iita.org I www.cgiar.org Effects of gamma rays on reproductive traits of Vigna vexillata (L.) A. Rich. Edhemuino M.,1,2, Balogun M.O2, Oyatomi O.1,Abberton M.1 1. International Institutes of Tropical Agriculture (IITA) P.M.B 5320, Ibadan, Oyo State, Nigeria 2. Department of Crop Protection and Environmental Biology, University of Ibadan
  2. 2. www.iita.org I www.cgiar.org • One of the earliest crops recognized by man is Cowpea, it is a pulse generally improved and cultivated all over the world (Aveling,1999). • The legume provides essential protein while the leaves are used as a nourishing vegetable. INTRODUCTION
  3. 3. www.iita.org I www.cgiar.org • Major production limitations ✓ Flower thrips (Megalurothrips sjostedti), ✓ Cowpea pod borer (Maruca spp.), and ✓ Pod-sucking bugs (Clavigralla spp.) • Resistance to these pests has been established mainly in wild non-cultivated Vigna species, such as V. vexillata. • Interspecific crossing has been attempted between V. vexillata and V. unguiculata but failed due to cross incompatibility.
  4. 4. www.iita.org I www.cgiar.org Mutagenesis could create new genetic variability that may be cross compatible with V. unguiculata Therefore, morphological characterization of 15 accessions of V. vexillata, irradiated with gamma ray at 250, 300 and 350 (Gy) doses were investigated.
  5. 5. www.iita.org I www.cgiar.org Materials and Methods • 15 accessions of V. vexillata were sent to Plant Breeding and Genetics Laboratory of International Atomic Energy Agency, Seibersdorf, Austria for gamma irradiation (60Co) using a Gamma Cell with an activity of 202 Gy/min. • All the collected genotypes were sown in a RCBD with four replications
  6. 6. www.iita.org I www.cgiar.org Results and Discussion Table 1: Analysis of variance of different factorial levels α = 0.05 Source of variation DFFL DFRP PDLTH PWDTH FLWDTH Accession 1253.57** 1742.73** 8.16** 89.25** 1.60** Dosage 2787.65** 2528.95** 1.14 8.87 0.09 Accession* Dosage 316.82 410.47 0.58 14.98** 0.44 Error 457.25 447.75 0.42 4.51 0.42 DFFL - Days to first flowering, DFRP - Days to first ripe pods. PDLTH - Pod length, PWDTH - Pod width and FLWDTH-Flower width.
  7. 7. www.iita.org I www.cgiar.org Table 2: Average duration effect of accession to some reproductive parameters of V. vexillata Accessions DFFL DFRP PDLTH PWDTH FLWDTH TVNu-470 83.75abc 105.75ab 10.78bc 3.46de 4.25a TVNu-584 91.19 ab 116.62ab 8.61e 3.13f 3.07de TVNu-64 62.00e 83.12c 13.90a 4.56bc 3.12de TVNu-240 62.06e 86.43c 13.90a 4.71ab 3.24cde TVNu-72 64.87de 85.5c 13.43a 4.87a 3.21cde
  8. 8. www.iita.org I www.cgiar.org Dosages DFFL DFRP PDLTH PWDTH FLWDTH 0 86.69a 113.32a 10.62c 2.07c 3.52a 250 75.28a 100.48a 11.75a 2.24bc 3.45a 300 74.85a 103.44a 10.88bc 2.55a 3.45a 350 73.94a 99.79a 1.49ab 2.40ab 3.42a Accession*Dosage NS NS ** ** NS CV(100%) 27.40 20.22 14.98 9.55 18.8 Table 3: Effects of Dosage levels on the reproductive parameters of Vigna vexillata
  9. 9. www.iita.org I www.cgiar.org Acknowledgement Prof M. Abberton - Head GRC/IITA Dr. M.O Balogun – University of Ibadan Mr O. Olaniyi - Seedbank Manager/IITA
  10. 10. www.iita.org I www.cgiar.org Conclusion • All treatment doses of radiation (0, 250, 300 and 350Gy) caused morphological diversity in the reproductive traits of plants.
  11. 11. www.iita.org I www.cgiar.org THANKS FOR LISTENING

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