An essential cellular factor for nuclear mRNA export called Mex67p which has homologous proteins in human and Caenorhabditis elegans was identified through its genetic interaction with nucleoporin Nup85p. In the thermosensitive mex67-5 mutant, poly(A)+ RNA accumulates in intranuclear foci shortly after shift to the restrictive temperature, but NLS-mediated nuclear protein import is not inhibited. In vivo, Mex67p tagged with green fluorescent protein (GFP) is found at the nuclear pores, but mutant mex67-5-GFP accumulates in the cytoplasm. Upon purification of poly(A)+ RNA derived from of UV-irradiated yeast cells, Mex67p, but not nucleoporins Nup85p and Nup57p, was crosslinked to mRNA. In a two-hybrid screen, a putative RNA-binding protein with RNP consensus motifs was found to interact with the Mex67p carboxy-terminal domain. Thus, Mex67p is likely to participate directly in the export of mRNA from the nucleus to the cytoplasm.

Oilfield in Assam are located in and around the rice fields. Rice crop in the vicinity of flare pits near oil collecting stations (OCS) get illuminated throughout and high spikelet sterility is caused. In the present study, attempt is being made to determine the response of some traditional and modern cultivars of different duration groups under prolonged photoperiod near the pit. Photoperiod insensitive medium duration variety like Jaya was least affected the light intensity. Due to prolong light hours, days to 50% flowering were affected in traditional long duration variety. Amongst the yield attributing characters, ear bearing tillers/hill, sterility (%), panicle length and grains/panicle were effected due to prolonged light hours; while light period had little effect or no effect on plant height, total number of tillers/hill and test weight.