The expression patterns of REF and SRPP in the latex of rubber tree clone RY 7-33-97. The relative expression levels of the six REF and SRPP genes were normalized to HbActin. CK (control check), latex from the first tapping; D48h, D96h, latex harvested 48 and 96 h after tapping, distilled water treatment; E48h, E96h, latex harvested 48 and 96 h after tapping, ethylene treatment. Data from qRT-PCR contains three biological repeats and the error bars indicate the standard deviations. Above an error bar, the symbol * indicates a difference of p < 0.05 (Student’s t-test), and the symbol ** indicates a difference of p < 0.01 (Student’s t-test); D48h and D96h were compared to CK, and E48h and E96h were respectively compared to D48h and D96h.