TITLE:
Determination and inheritance of phytic acid as marker in diverse genetic group of bread wheat
AUTHORS:
Ijaz Ahmad, Fida Mohammad, Aurang Zeb, Ijaz Rasool Noorka, Farhatullah, Sultan Akber Jadoon
KEYWORDS:
Phytic Acid; Diallel Analysis; Inheritance; Heritability; Yield; Traits
JOURNAL NAME:
American Journal of Molecular Biology,
Vol.3 No.3,
July
17,
2013
ABSTRACT: Phytic acid (Myo-inositol 1,2,3,4,5,6 hexa-kisphophate)
is a storage form of phosphorus and can accumulate to the levels as high as 35%
in the wheat kernel. Phytic acid acts as an inhibitor for macronutrients as
well as micronutrients and located in the bran of wheat kernel. Due to its
inhibitory role, a high concentration of phytic acid is undesirable as it
hinders the bio-availability of some essential nutrients such as Fe, Mg, Ca, Zn
and Cu, etc. In order to check the inheritance of phytic acid in wheat
kernels, phytic acid concentration was initially determined in kernels of 10
wheat genotypes to identify two contrasting genetic groups for diallel
analysis. Based on pre-screening results of 10 wheat genotypes, five wheat genotypes
(3 with high and 2 with low phytic acid concentration) were crossed in all
possible combinations during 2007-2008 by 5 × 5 full diallel mating fashion to
insight the inheritance of phytic acid and other yield contributing traits.
All 20 F1 hybrids and five parental genotypes revealed significant
differences statistically, except plant maturity. The narrow and broad sense heritability estimates varied widely
among traits for spike length (0.17, 0.62), spikelets spike-1 (0.35, 0.74), tillers plant-1 (0.05, 0.52) and phytic acid concentration (0.01, 0.86). The values for
phytic acid concentration ranged from 0.56% to 3.43% among F1 hybrids and 1.06 to 3.67% for parental genotypes. F1 hybrids,
Ps-2005 × Ghaznavi (0.56%), AUP-4006 × Ps-2004 (0.74%), Janbaz × Ps-2004
(0.89%) and Janbaz × Ps-2005 (1.01%), had the lowest concentration of phytic
acid. The study concluded that F1 hybrids with low phytic acid
concentration could yield desirable segregants.