By AA. Kandil1, AE. Sharief2,*, Hasnaa SM. Gomaa3
- Department of Agronomy, Mansoura University, Egypt (1)
- Agriculture Research Center, Ministry of Agriculture and land reclamation, Egypt (2,3)
In
order to study gene action for yield and its components using 8 × 8 diallel
crosses excluding reciprocals during 2013/2014 and 2014/2015 growing seasons at
Tag El-Ezz Research Station, Dakahlia Governorate, the genotypes were Sides 12,
Gemmiza 11, Maser 1, Maser 2, Shandaweel 1, Giza 168, Sakha 93, and Sakha 94.
Results revealed that both additive (D) and dominance (H1 and H2) genetic
variance were significant for the all studied characters, indicating the
importance of additive and dominance gene effects in controlling these
characters.
The dominance genetic variance was higher in the magnitude as
compared to additive one, resulting in (H1/D)0.5 exceeding than more unity for
all studied characters except spike density and number of tillers/plant. The
“F” values which refer to the covariance of additive and dominance gene effects
in the parents revealed positive and significant for flag leaf length and flag
leaf area, extrusion length, number of tillers/plant number of spikes/plant,
number of grains/spike and 1000- grain weight, indicating that dominant alleles
were more frequent than the recessive ones in the parents for this character,
while negative “F’ value for remaining characters indicated excess of recessive
alleles among parents.
The overall dominance effects of heterozygous loci h2,
indicated directional dominance for heading date, flag leaf length, flag leaf
area, spike length, extrusion length, spike density, grain yield/spike, number
of tillers/plant number of spikes/plant, number of grains/ spike and grain
yield/plant. Proportion of genes with positive and negative effects in the
parent (H2/4H1) was deviated from 0.25 for all studied characters Heritability
in narrow sense was moderate (0.369) for grain yield/plant. Get the full articles at: http://www.innspub.net/ijaar/estimates-of-gene-action-for-yield-and-its-components-in-bread-wheat-triticum-aestivum-l/
Journal Name: International Journal of Agronomy and Agricultural Research (IJAAR)
Publisher Name: International Network For Natural Sciences (INNSPUB)
