SELECTION EFFECTIVNESS FOR PODS NUMBER IN EARLY GENERATIONS OF SEED YIELD OF COWPEA CULTIVAR IMPORTED

Abstract

A trail was carried out at the farm of college of agriculture in Abu-Ghraib.Three selection cycles followed with yield trail in spring season 2013 were conducted. RCBD was used with three replicates. The aim was to select cowpea cultivar from cultivar imported (bayader). The selection indices was the number of pods per plant. Selection was processed at three generations (F2 , F3 , F4). Population means were compared among selected and nonselected of these generations. Genetic parameters such as heritability, gain due to selection and standard deviation were estimated for traits studied. Results revealed that selection was effective with significance increases of pod length, number of pods per plant and seed yield of single plant. Populations selected in F4 gave highest means amount 17.26cm, 67 pods and 131gm, respectively. Also, generation's means in F4 was superior in these traits. There were no significant effects by selection in seed number per pod and 100 seed weight. Heritability was moderate and under moderate excepting of 100 seed weight that gave high value. Gain due to selection was high values in pods number per plant about 6.2 and 3.2 in F2-F3 and F3-F4, respectively, and 16.5 and 14.2 in seed yield of single plant of F2-F3 and F3-F4 , respectively. From above, we can conclude that the selection of pods number leaded to increase seed yield significantly with generation's progress. This was a best indicator for producing promising cultivar more adapted in middle region of Iraq.