[i] ^aPercentage refers to the number of a structural class of LTR-RTs (e.g., solo LTRs or truncated elements) relative to the total number of the three classes of LTR-RTs; intensity of DNA loss refers to the amount of DNA removed through solo LTR formation or truncated element generation relative to the original sizes of all LTR-RTs upon their integration in the rice genome.

[ii] ^bP-value by Student's t-test.