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Genetic Component and Wr-Vr Graph Analysis in Bread Wheat (Triticum aestivum L.) Genotypes

Department of Genetics and Plant Breeding, Lovely Professional University, Phagwara -144 411 (Punjab), India
*(e-mail :; Mobile : 90567 87045)
(Received : November 27, 2021; Accepted : January 20, 2022)


This study was performed to investigate gene actions for some important traits using half diallel mating
design in wheat at research farm of Lovely Professional University. Seven wheat genotypes viz., MP
1203, LOK 1, HD 2932, MP 3173, HI 1544, MP 4010 and GW 273 were crossed in all possible combinations
except reverse during 2017-18 cropping season. The resultant F1 hybrids were planted following a
randomized complete block design using three replications in the subsequent wheat growing season of
2018-19. Genetic component analysis found that additive effect was non-significant but dominance
effect (H1) was significant and greater in magnitude indicating dominance gene action for protein content
and grain yield/plant. All traits under study showed that the value of regression coefficient slope deviated
significantly from zero but not from unity, which indicated absence of non-allelic interaction. Regression
line intercepted Wr axis below the origin, which indicated the presence of over dominance for days to
50% heading, days to maturity, number of productive tillers/plant, ear length, ear weight, number of
ears/plant, biological yield/plant, harvest index and grain yield/plant. The value of mean degree of
dominance was greater than one, indicating availability of over dominance for all traits except plant
height and number of spikelets/ear.
Key words : Genetic component, Wr-Vr graph, wheat