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Table 3 Transgenerational alteration and inheritance of gene expression patterns in the 14 randomly chosen S2 plants derived from one S1 individual #3 (S1–3), which was derived from a single Hg2+ (50 μm)-treated S0 individual

From: Transgenerational memory of gene expression changes induced by heavy metal stress in rice (Oryza sativa L.)

Gene name    Gene expression patterns in the S2 progeny Frequency (%)b
  S0-Hg2+ S1–3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Inherit. of S1 pat. Rev. to S0 pat. Rev. to mock pat. New pat. (Trans. Memory/others)
Tos17A U U U U U U r U U r r r U r U r 57.1 0.0 42.9 0.0 (0.0/0.0/)
Tos17B U +U ++U ++U ++U ++U ++U ++U ++U +U U U +U +U +U +U 35.7 0.0 14.3 50.0 (50.0/0.0)
SNF-FZ14 U +U ++U U U U U U r r r ++U U U U U 0.0 21.4 64.3 14.3 (14.3/0.0)
OsHMA1 U +U +U +U U +U r U U U U +U U r r U 28.6 50.0 21.4 0.0 (0.0/0.0)
OsHMA2 U D +U r r U r r U -D -D -D -D -D -D -D 0.0 14.3 28.6 57.1 (0.0/57.1)
OsHMA6 U +U +U U ++U U ++U U +U U U ++U ++U U +U r 21.4 42.9 7.1 28.6 (28.6/0.0)
OsHMA7 U +U +U +U +U +U +U U +U U U +U U U U U 50.0 50.0 0.0 0.0 (0.0/0.0)
OsHMA9 U U U U U U U U U U U U U U U U 100.0 0.0 0.0 0.0 (0.0/0.0)
Average Freq. (%)a                  36.6 22.3 22.3 18.8 (11.6/7.2)
  1. Explanation of symbols: U denotes up-regulated gene expression in the S0 plant, and kept the trend in S1–3 and S2 individuals;
  2. +U denotes further up-regulated gene expression in the S1–3 and kept the trend in S2 individuals;
  3. ++U denotes further up-regulated gene expression in S2 individuals compared to their S1 progenitor;
  4. D =denotes down-regulated gene expression in the S1–3 compared to the Mock control;
  5. -D denotes further down-regulated gene expression in S2 individuals compared to their S1 progenitor;
  6. r denotes reversal to Mock control expression pattern in the S2 progeny;
  7. Note: aThe average frequency of the specified pattern in S2 progeny plants. For calculations the two copies of Tos17 were treated separately,
  8. bRelative band intensities were used to calculate the percent progeny following in either of the four gene expression categories (cf. Fig. 3)