Amino acids application enhances flowers insecticidal protein content in Bt cotton

Table 2 The effect of application of 5 amino acids composition and 21 amino acids composition on flower protease and peptidase activities of the two Bt cotton cultivars at flowering period

Treatment	Protease activity in fresh weight /(mg·g^− 1·h^− 1)		Peptidase activity in fresh weight /(μmol·g^− 1·h^− 1)
Treatment	2016	2017	2016	2017
S1CK	54.6^d	47.5^e	170.2^d	170.2^c
S1A1	74.4^bc	75.1^bc	245.5^c	251.8^b
S1A2	76.3^b	61.3^cd	254.3^bc	257.3^b
S3CK	69.2^cd	55.5^de	176.0^d	168.0^c
S3A1	95.7^a	90.0^ab	285.0^ab	333.9^a
S3A2	108.5^a	93.8^a	323.6^a	369.7^a

Note: S1 and S2 indicate the conventional Bt cultivar Sikang1 and hybrid Bt cultivar Sikang 3, respectively. A1, A2, CK represent 5 amino acids treatment, 21 amino acids treatment, and the control, respectively. Differences between treatments within the same year labeled by the same letter are statistically not significant (LSD test at 0.05 significance level)

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