qPCR. Material stored at 280 uC was finely ground in liquid N2 and
600 mg rice or 200 mg haulms was used for DNA extraction using
a CTAB protocol as described at http://gmo-crl.jrc.ec.europa.eu/
summaries/TC1507-DNAextrc.pdf. DNA was spectrophotometrically
quantified by measuring OD at 260 nm.