Bt cotton seed purity in Burkina Faso: status and lessons learnt

Table 4 Purity status of Bt seeds in samples from Bt-cotton fields

	Presence of Cry1Ac	Presence of Cry2Ab	Double genes presence
Number of sample	349	349	349
Share of samples corresponding to fields grown from pure^a seeds for the concerned Cry gene /%	59.6	53.6	40.4
Rate^b of Cry1Ac presence in the samples corresponding to fields grown from pure seeds for this gene /%
Mean	96.0		96.7
Std. deviation	4.5		4.4
Rate^b of Cry2Ab presence in the samples corresponding to fields grown from pure seeds for this gene /%
Mean		95.4	95.9
Std. deviation		4.6	4.5

^a Purity is claimed when the presence of Bt gene was observed on no less than 10 seeds out of 11 of each sample
^b Rate calculated by the number of seeds with Cry gene detected out of eleven of each sample

ISSN: 2523-3254