Genetic Analysis of Grain Yield and its Components of Maize (Zea mays L.) Inbred Lines

Lay, Padma; Razdan, A.K.

doi:10.20546/ijcmas.2017.607.163

Cited by 1 publication

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References 2 publications

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“…Diallel crosses have been used for a long time in genetic research to determine the inheritance of a trait among a set of genotypes and to identify superior parents for hybrid or cultivar development (Aliu et al, 2009). These methods have been highly practiced in different crops like maize (Njeri et al, 2017;Owusu et al, 2017;Lay and Razdan, 2017;Brahmbhatt et al, 2018), rice (Huang et al, 2015;Kundan et al, 2013), Brassica (Tian et al, 2017) and cassava (Tumuhimbise et al, 2014). Hence, it is necessary to understand the nature and magnitude of gene action as well as combining ability of yield and its attributes.…”

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confidence: 99%

Genetic action and potence ratio of maize in an 88 diallel cross growing under saline condition

Rohman¹,

Omy²,

Begum³

et al. 2019

J. Plant Breed. Crop Sci.

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Twenty-eight hybrids of Zea mays L. produced in 2015-16 from 8×8 half diallel mating design were evaluated along with their parents in 2016-2017 under saline condition to find out genetic action and potency ratio of some agronomic and yield contributing traits. Genetic action and potency ratio were analyzed following Hayman's diallel analyses and Smith's formula, respectively. Genetic parameter like additive variance (D), dominance variance (H 1), proportion of positive and negative genes in the parents (H 2), relative frequency of dominant and recessive alleles in the parents (F), dominance effect over all loci in heterozygous phase (h 2) suggested that traits like days to tasseling, days to silking, anthesis silking interval, ear height and number of grains/plant are governed by dominant alleles in these traits. Contrariwise, the data of plant height and 100-grain weight were shown to have higher frequency of recessive alleles. Proportion of genes with positive and negative [(4DH 1) 0.5 + F]/[(4DH 1) 0.5-F] effects suggested the asymmetrical distribution of dominant and recessive alleles for all the traits except yield/plant. Under saline condition heritability in narrow sense (h 2 n) was found very low which indicates a possible strong influence of stress in the growing environment. These parameters along with Vr-Wr graphs and potency ratio indicated overdominance in desirable direction, and thus, heterosis breeding is important to improve those traits in maize under salinity.

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