Paper Details

Determination of genetic parameters for yield components in bread wheat

Imren Kutlu, Murat Olgun

DOI: https://dx.doi.org/10.12692/ijb/6.12.61-70

Int. J. Biosci. 6(12), 61-70. June, 2015. (PDF)

Abstract:

This study was conducted to investigate the genetic control of yield components. A six parent diallel cross, including reciprocals, of wheat was tested for heading and maturing time, plant and peduncle height, spike length, spikelet number per spike, grain number and weight per spike, harvest index and grain yield per plant. These traits measured were analyzed employing the techniques of Jinks-Hayman type diallel analyses. Results revealed that significant variance among the genotypes to make diallel analyses for all traits and the scaling test suggested that the additive-dominance model was adequate for data analysis for all characters except for maturing date, spike length and grain weight per spike. Additive (a and D) and non-additive (b and H1, H2) gen effects were involved in the heritance of all traits according to diallel variance analyses and estimation of genetic parameters. The Wr/Vr graphs and (H1/D)0,5 value revealed that partial dominance for plant height, peduncle length, spikelet and grain number per spike, while over dominance for harvest index and grain yield per plant. Furthermore, the regression coefficient of Wr on Vr was significant from unity for heading and maturing time, spike length and grain weight per spike indicating the presence of epistatic gene effects. The effective selection was possible in early generations for plant height, peduncle length, spikelet number per spike, grain number per spike and harvest index, since these traits had high narrow sense heritability, which estimated that according to additive gene action.