This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal).This article has been retracted at the request of the Authors, owing to textual overlap with previous publications.There is verbatim overlap of Rao et al., 2009, to the following publications without attribution to the sources and no overlap in authors: Cell. Mol. Biol. Lett., 7 (2002) 849 – 858 (http://www.cmbl.org.pl/pdf/Vol7_p849.pdf?); Phytochem. Rev., 7 (2008) 387 – 394, https://doi.org/10.1007/s11101-007-9075-z; Curr. Sci., 5 (2003) 368 – 380 (https://www.currentscience.ac.in/Downloads/article_id_084_03_0368_0380_0.pdf); Plant Biotechnol. J., 5 (2007) 221-229, https://doi.org/10.1111/j.1467-7652.2006.00225.x.There is verbatim overlap of Rao et al., 2009, to the following publication, which was cited, and includes two authors in common (T. Husnain and S. Riazuddin): Pak. J. Bot., 39 (2007) 223–230 (http://www.pakbs.org/pjbot/PDFs/39(1)/PJB39(1)223.pdf).