The mRNA levels of <i>RFT1</i> and <i>Hd3a</i> in Koshihikari, Nipponbare and Nona Bokra during the growing period in a natural field.

<p>(A) Expression levels of <i>RFT1</i> and <i>Hd3a</i> in top leaves. Expression values were plotted on a log₁₀ scale. Black triangles indicate the flowering date for each cultivar. (B) Changes in daylength at the growing location. Open triangle indicates the sowing date for each cultivar. Yellow boxes represent the period of long-day conditions (>13 h daylength).