Fig. 1. Relative levels of 18S ribosomal RNA and poly-A RNA in endosperm after 0 (ct), 2 (2d), or 4 (4d) days of heat stress (DHS) treatments. (A) 18S rRNA levels expressed per OD 260 of the RNA preparation. (B) Poly-A RNA levels normalized relative to OD 260 of the RNA preparation. Average RNA relative levels of each heat treatment were compared for each sampling date by LSD; a and b indicate statistically different values at 5% (*) and 1% (**) levels of significance.