RT-PCR of orfB CDS from 6AR F2 sterile and fertile plants. Ethidium bromide stained agarose gel (1%) showing the RT-PCR amplified products of the orfB CDS from the F2 progeny of the cross APMS-6A with the restorer line BR-1870. Lane 1 and lane 2 from sterile plants. Lane 3 and lane 4 from fertile plants. Lane 5: DNA molecular weight marker.