Table 1 Descriptive statistics of the germination traits under chilling and normal conditions*.

From: Genome-wide association study Identified multiple Genetic Loci on Chilling Resistance During Germination in Maize

Trait

n

Mean

Median

SD

Range

GR21_C (%)

241

41.48

30.00

37.48

0.00~100.00

GR_N (%)

241

84.89

90.00

15.56

50.00~100.00

RGR

241

0.46

0.35

0.39

0.00~1

DT50_C (day)

241

22.67

25.67

7.63

10.00~31.00

DT50_N (day)

241

2.77

2.67

0.76

1.00~7.00

RDT50

241

8.57

8.45

3.53

2.94~29.00

GI_C

241

0.64

0.37

0.62

0.00~2.00

GI_N

241

1.72

1.75

0.37

0.42~2.46

RGI

241

0.37

0.24

0.39

0.00~2.63

  1. *Statistics include number of observations (n), mean, median, standard deviation (SD), and range. The maize-282-diverse-panel was evaluated for 241 inbred lines, with enough seeds for germination tests under optimum (25 °C), or Normal (“_N”) conditions, and Chilling (“_C”) conditions (8 °C). Directly observed traits included Germination Rate (GR) on the 21st day under chilling conditions (GR21_C) and on the 7th day under normal conditions (GR_N); Days To 50% germination under Chilling (DT50_C) and Normal conditions (DT50_N); and Germination Index under Chilling (GI_C) and Normal conditions (GI_N) as GI = ∑(Gt/Tt), where Gt equals the number of seeds newly germinated on day t and Tt equals the number of days elapsed. In addition, three Relative (R) traits were derived by dividing the directly measured trait values (GR, DT50, and GI) under chilling conditions by their corresponding values under normal conditions. In total, we evaluated nine traits, described in detail as follows:
  2. GR21_C: Germination (root emergence) rate at 21 days under chilling conditions.
  3. GR_N: Germination (root emergence) rate at 7 days under normal (control) conditions.
  4. RGR: Relative germination rate (GR21_C/GR_N).
  5. DT50_C: Days to 50% root germination under chilling conditions (up to day 31).
  6. DT50_N: Days to 50% root germination under normal (control) conditions.
  7. RDT50: Relative days to 50% root germination (DT50_C/DT50_N).
  8. GI_C: Germination index from 0 to 31 days under chilling conditions.
  9. GI_N: Germination index from 0 to 7 days under normal (control) conditions.
  10. RGI: Relative germination index (GI_C/GI_N).
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