Publisher:International Journal for Biotechnology and Molecular Biology Research
Series Info:International Journal for Biotechnology and Molecular Biology Research;Vol. 4(1), pp. 9-23, October 2013
Type:Article
Keywords:Abiotic stress tolerance
,
trehalose-6- phosphate phosphatase (TPP)
,
durum wheat
,
trehalose
,
real time PCR
,
cloning
,
full length gene
,
drought stress
Abstract:
Trehalose is a non-reducing disaccharide which consists of two glucose units that functions as a
compatible solute to stabilize the membrane structures under heat and desiccation stress. Trehalose-6-
phosphate synthase (TPS) and trehalose-6- phosphate phosphatase (TPP) are the key enzymes for
trehalose biosynthesize in the plant kingdom. On the basis of bioinformatics prediction, fragment
containing an open reading frame of 945 bp was cloned from durum wheat. Sequence comparison and
analysis of conserved domains revealed the presence of a TPP domain. Full length of the gene was
isolated using gene race technology. Semi-quantitative RT-PCR and real time quantitative PCR
indicated that the expression of this gene is up-regulated in response to drought stress. The
biochemical assay of the trehalase activity showed that the enzyme's activity decreased under the
dehydration stress. The obtained phylogenic tree showed that the isolated TPP protein forms a distinct
clad close to the Oryza sativa trehalose-6- phosphate phosphatase. In silico and comparative mapping
indicated that the isolated TPP gene is localized on rice chromosome 8, durum wheat chromosome 20,
bread wheat chromosome 3B, oat linkage group E, sorghum chromosome 4 and barley 5H.