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Table 3 Variation in triplicate measurements for each amplicon in two plants of as-hpl line A340-1: standard deviation of endogenous control adds to the standard deviation of the transgene, resulting in a ΔCt standard deviation as high as the difference (of one) to measure

From: Two-fold differences are the detection limit for determining transgene copy numbers in plants by real-time PCR

Plant

Amplification of ampNAT1 (transgene)

Amplification of ampGSP1 (endogenous control)

ΔCt

 

Ct FAM

Average ± SD

Ct TET

Average ± SD

Ct FAM-Ct TET

Average ± SD

A340-1-1

21.17

21.72 ± 0.47

20.57

20.39 ± 0.19

0.60

1.32 ± 0.64

 

21.99

 

20.42

 

1.57

 
 

21.99

 

20.19

 

1.80

 

A340-1-2

21.13

21.26 ± 0.16

20.19

20.23 ± 0.12

0.94

1.02 ± 0.25

 

21.20

 

20.37

 

0.83

 
 

21.44

 

20.14

 

1.30