Poonam S Jaiswal, Navneet Kaur and Gursharn Singh Randhawa
Indian Institute of Technology Roorkee, India
Posters & Accepted Abstracts : Biomed Res
Guar (Cyamopsis tetragonoloba) is an important industrial crop because of many industrial applications of galactomannan gum present in its seeds. It, being a legume crop, can fulfil its nitrogen requirement through biological nitrogen fixation. However, this crop usually encounters nitrogen deficiency during the initial stages of crop growth when nitrogen fixing nodules have not been fully developed. The knowledge about genes of guar involved in various processes can help in developing improved varieties of this crop. qRT-PCR is a preferred technique for accurate quantification of gene expression data. This technique requires use of appropriate reference genes from the crop to be studied. Such genes have not been yet identified in guar. In the present study, expression stabilities of 10 candidate reference genes, viz., CYP, ACT 11, EF-1α, TUA, TUB, ACT 7, UBQ 10, UBC 2, GAPDH and 18S rRNA were evaluated in shoot and root tissues of guar (RGC- 1066 variety) under nitrogen stress. Four different algorithms, geNorm, NormFinder, BestKeeper and ΔCt approach were used to assess the expression stabilities of reference genes and the results obtained were integrated into comprehensive stability rankings. The study indicated that CYP, TUA and UBC 2 genes were the most stable reference genes in guar under nitrogen stress whereas EF-1α gene was the most unstable reference gene. The CYP, TUA and UBC 2 genes were the most suitable reference genes for accurate normalization of the gene expression data under nitrogen stress. Our findings are expected to provide a boost to gene expression studies in guar under nitrogen stress. Such studies are likely to improve our understanding of molecular mechanisms of nitrogen uptake in guar seedling and facilitate research initiatives to determine genes expressing under nitrogen stress in this industrially important crop.