GENETICS OF THRIPS (Megalurothrips sjostedti) RESISTANCE IN COWPEA (Vigna unguiculata (L.) WALP.)

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dc.contributor.authorRICHARD, DORMATEY
dc.date.accessioned2014-06-13T07:36:30Z
dc.date.available2014-06-13T07:36:30Z
dc.date.issued2011-08
dc.descriptionA thesis submitted to the post graduate School, Ahmadu Bello University, in partial fulfilment of the requirement for the Degree of Masters of Science in Plant Breeding DEPARTMENT OF PLANT SCIENCE FACULTY OF AGRICULTURE AHMADU BELLO UNIVERSITY ZARIA, NIGERIA August, 2011en_US
dc.description.abstractGenetics of resistance of Megalurothrips sjostedti in cowpea was studied, field trial was conducted at Savannah Agricultural Research Institute (SARI), Nyankpala, Ghana, involving F1, F2, backcross populations and the five parental materials: four improved varieties; Sampea 8, Ife brown, Sampea 7, Padi-tuya and one local landrace, Sanzi obtained by bi-parental mating design at the Institute for Agricultural Research (IAR), Samaru, Nigeria. Nyankpala is located on (90 251 N: 00 581 W). The study was undertaken to validate the resistance status of the parental materials, to elucidate the mode of inheritance of flower bud thrips resistance in these genotypes and to establish the genetic relationships between the resistance genes. The results showed Sanzi to be resistant and Sampea 8, moderately resistant whilst Ife Brown, Sampea 7 and Padi-tuya were classified as susceptible. Maternal effect was implicated while frequency distributions of the F2 and backcross generations revealed quantitative inheritance. Additive, dominance and epistatic gene effects made major contributions. The effective factors of 3 to 4 indicated an oligogenic inheritance of resistance genes for flower bud thrips. The study suggested that some of the resistant genes in Sampea 8 and Sanzi are non-allelic. Broad sense heritability estimates ranged from 53.00 % to 58.00 % and 85.00 % to 94.00 % in Number of flower bud thrips per plant and pods per peduncle. Narrow sense heritability ranged from 13.00 % to 28.00 % and 18.00 % to 41.00 % coupled with genetic advance of 3.64 to 4.78 respectively. The estimates of broad and narrow sense heritability with genetic advance showed the possibility to increase and diversify resistance of cowpea to flower bud thrips by using these two resistant genotypes as viable sources for resistant to Megalurothrips sjostedti in high yielding commercial cultivarsen_US
dc.identifier.urihttp://hdl.handle.net/123456789/4869
dc.language.isoenen_US
dc.subjectTHRIPS,en_US
dc.subjectMegalurothrips sjostedti,en_US
dc.subjectRESISTANCE,en_US
dc.subjectCOWPEA,en_US
dc.subjectVigna unguiculata,en_US
dc.subjectWALPen_US
dc.titleGENETICS OF THRIPS (Megalurothrips sjostedti) RESISTANCE IN COWPEA (Vigna unguiculata (L.) WALP.)en_US
dc.typeThesisen_US
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