Resistance of conventional and isogenic transgenic maize hybrids to
                        <i>Spodoptera frugiperda</i> (Lepidoptera:
                    Noctuidae)

Moraes, Andrea Rocha Almeida de; Lourenção, André Luiz; Paterniani, Maria Elisa Ayres Guidetti Zagatto

doi:10.1590/1678-4499.0367

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Plant Protection • Bragantia 74 (1) • Mar 2015 • https://doi.org/10.1590/1678-4499.0367 copy

Resistance of conventional and isogenic transgenic maize hybrids to Spodoptera frugiperda (Lepidoptera: Noctuidae)

Authorship SCIMAGO INSTITUTIONS RANKINGS

This study evaluated the effect of damage caused by S. frugiperda on yield of maize hybrids and their conventional and isogenic transgenic versions, with different Bt toxins, in field conditions. Experiments were conducted in the municipalities of Campinas and Mococa, São Paulo State, Brazil, in the growing seasons of 2010/2011 and 2011/2012, in a randomized complete block design, with 12 treatments and four replications. The variables evaluated were: grain productivity, one hundred grain weight and grain yield. For the assessment of damage caused by S. frugiperda was verified the intensity of leaf injuries through visual scale of notes, with variation of 0 and 9, from 15 to 60 days after sowing. Lower scores of damage caused by S. frugiperda were found in transgenic hybrids. Most conventional hybrids do not differ in grain productivity from at least one of isogenic transgenic versions. The same maize hybrid with different Bt toxins may have different productive behavior in field conditions. Different Bt toxins respond differently to damage caused by S. frugiperda.

Zea mays L.; fall armyworm; genetically modified maize; yield

Hybrid	Campinas 2010/2011(¹) Days after sowing (DAS)(¹)
Hybrid	15	30	45	60
P30F35	1.3 aC	3.9 bB	6.5 aA	6.6 aA
P30F35 YG	0.5 bD	1.1 cC	2.0 cB	2.7 cdA
P30F35 HX	0.4 bC	0.8 cC	1.3 dB	1.9 eA
DKB390	1.4 aC	4.4 bB	6.5 aA	6.6 aA
DKB390 YG	0.4 bD	1.2 cC	2.1 cB	3.1 cA
DKB390 PRO	0.4 bC	0.6 cC	1.3 dB	2.8 cdA
DAS2B710	1.7 aD	5.4 aC	6.2 aB	6.8 aA
DAS2B710 HX	0.3 bB	0.7 cB	1.7 cdA	2.1 deA
Maximus	1.2 aC	4.5 bB	5.3 bA	5.7 bA
Maximus Viptera	0.3 bB	0.6 cB	1.3 dA	1.5 eA
Mean	0.8 D	2.3 C	3.4 B	4.0 A
Hybrid	Mococa 2010/2011(¹)
P30F35	2.4 aD	3.3 abC	4.3 aB	6.5 aA
P30F35 YG	0.5 bC	0.8 dBC	1.4 cB	2.0 defA
P30F35 HX	0.6 bB	1.0 dB	1.0 cB	2.6 cdA
DKB390	2.4 aD	3.9 aC	4.6 aB	6.6 aA
DKB390 YG	0.9 bB	1.2 dB	1.2 cB	1.9 efA
DKB390 PRO	0.4 bC	0.7 dC	1.4 cB	2.9 cA
DAS2B710	2.3 aD	3.1 bC	4.2 abB	6.8 aA
DAS2B710 HX	0.8 bC	1.2 d BC	1.5 cB	2.4 cdeA
Maximus	1.9 aC	2.4 cC	3.6 bB	5.2 bA
Maximus Viptera	0.4 bC	0.7 dBC	1.1 cB	1.7 fA
Mean	1.3 D	1.8 C	2.4 B	3.9 A

Hybrid	Grain productivity(¹)	One hundred grain weight(¹)	Grain yield(¹)
	kg ha^–1	g	%
P30F35	7,105 cd	34.4 b	76.6 a
P30F35 YG	7,931 abc	38.1 ab	76.0 a
P30F35 HX	8,540 a	38.1 ab	80.5 a
DKB390	6,810 d	38.1 ab	71.6 a
DKB390 YG	8,001 abc	38.8 ab	72.9 a
DKB390 PRO	8,217 ab	37.5 ab	71.0 a
DAS2B710	7,336 bcd	35.6 ab	72.9 a
DAS2B710 HX	7,895 abc	38.1 ab	73.6 a
Maximus	8,716 a	40.0 ab	79.6 a
Maximus Viptera	8,888 a	41.3 a	77.7 a
Mean	7,944	38.0	75.3
C.V. (%)	8.0	9.8	11.0

	GP	100GW	GY	Score of damage
				15	30	45	60
GP	-
100GW	0.68^* * , ** Significant by t-test at 5% and 1%, respectely.	-
GY	0.73^* * , ** Significant by t-test at 5% and 1%, respectely.	0.34	-
Score of Damage 15	–0.84**	–0.62	–0.48	-
Score of Damage 30	–0.91**	–0.65^* * , ** Significant by t-test at 5% and 1%, respectely.	–0.58	0.96**	-
Score of Damage 45	–0.85**	–0.60	–0.55	0.99**	0.97**	-
Score of Damage 60	–0.83**	–0.64^* * , ** Significant by t-test at 5% and 1%, respectely.	–0.53	0.98**	0.97**	0.99**	-

Hybrid	Orthogonal contrasts	Variables
Hybrid	Orthogonal contrasts	GP	100GW	GY
P30F35	Y₁= 2m₁-m₂-m₃	–7.53^ , * Significant at 1% and 5% probability;	–2.26*	–0.56ⁿ^s
P30F35	Y₂= m₂-m₃	–4.76^ , * Significant at 1% and 5% probability;	–1.96ⁿ^s	0.17ⁿ^s
DKB390	Y₁= 2m₁-m₂-m₃	–2.10*	0.18ⁿ^s	–0.10ⁿ^s
DKB390	Y₂= m₂-m₃	–2.36*	–0.32ⁿ^s	–0.33ⁿ^s
DAS2B710	Y₁= m₁-m₂	–2.05ⁿ^s	–1.31ⁿ^s	–1.89ⁿ^s
Maximus	Y₁= m₁-m₂	–0.40ⁿ^s	–0.60ⁿ^s	–0.40ⁿ^s

Hybrid	Campinas 2011/2012(¹) Days after sowing (DAS)(¹)
	15	30	45	60
P30F35	2.2 aD	3.4 aC	4.1 aB	4.8 bcA
P30F35 YG	0.3 bC	1.4 cdB	2.5 cdA	2.5 eA
P30F35 HX	0.2 bC	1.3 dB	1.6 fB	2.6 eA
DKB390	2.1 aD	3.5 aC	4.6 aB	5.4 abA
DKB390 YG	0.2 bC	1.6 cdB	2.4 cdeA	2.6 eA
DKB390 PRO	0.1 bC	1.7 cdB	2.2 deA	2.4 eA
DAS2B710	2.0 aD	3.4 aC	4.3 aB	5.7 aA
DAS2B710 HX	0.2 bC	2.0 bcB	2.9 bcA	3.3 dA
Impacto	1.8 aD	2.4 bC	3.4 bB	4.5 cA
Impacto Viptera	0.1 bC	1.5 cdB	1.8 efB	2.3 eA
Mean	0.9 D	2.2 C	3.0 B	3.6 A
Hybrid	Mococa 2011/2012(¹)
P30F35	2.1 abcD	3.3 abC	4.6 aB	5.4 aA
P30F35 YG	0.8 efC	1.7 deB	2.4 cdA	2.7 cdA
P30F35 HX	1.3 defB	1.7 deB	2.5 cdA	2.8 cdA
DKB390	2.4 abD	3.6 aC	4.5 aB	5.3 aA
DKB390 YG	1.4 cdeB	2.2 cdA	2.3 cdA	2.5 dA
DKB390 PRO	0.6 fB	2.2 cdA	2.5 cdA	2.7 cdA
DAS2B710	2.6 aC	3.3 abB	4.8 aA	5.3 aA
DAS2B710 HX	1.0 efC	2.6 bcB	3.0 cAB	3.3 cA
Impacto	1.9 bcdC	3.1 abB	3.8 bA	4.3 bA
Impacto Viptera	1.0 efB	1.3 eB	2.1 dA	2.2 dA
Mean	1.5 D	2.5 C	3.2 B	3.6 A

Hybrid	Grain productivity(¹)	One hundred grain weight(¹)	Grain yield(¹)
	kg ha^–1	g	%
P30F35	8,587 cd	37.5 a	82.3 a
P30F35 YG	8,939 bcd	38.4 a	78.4 b
P30F35 HX	9,499 ab	40.6 a	84.5 a
DKB390	8,336 d	37.6 a	82.0 a
DKB390 YG	8,932 bcd	37.1 a	78.9 b
DKB390 PRO	9,545 ab	39.5 a	81.7 a
DAS2B710	8,556 cd	38.9 a	78.2 b
DAS2B710 HX	9,015 bc	35.6 a	78.9 b
Impacto	9,453 ab	38.8 a	81.9 a
Impacto Viptera	10,000 a	41.3 a	87.5 a
Mean	9,086	38.5	81.5
C.V. (%)	4.4	8.2	6.1

	GP	100GW	GY	Score of damage
				15	30	45	60
GP	-
100GW	0.59	-
GY	0.63^* * , ** Significant by t-test at 5% and 1%, respectively.	0.55	-
Score of Damage 15	–0.73^* * , ** Significant by t-test at 5% and 1%, respectively.	–0.25	–0.28	-
Score of Damage 30	–0.73^* * , ** Significant by t-test at 5% and 1%, respectively.	–0.40	–0.37	0.90**	-
Score of Damage 45	–0.70^* * , ** Significant by t-test at 5% and 1%, respectively.	–0.30	–0.34	0.96**	0.97**	-
Score of Damage 60	–0.69^* * , ** Significant by t-test at 5% and 1%, respectively.	–0.21	–0.29	0.96**	0.95**	0.97**	-

Hybrid	Orthogonal contrasts	Variables
Hybrid	Orthogonal contrasts	GP	100GW	GY
P30F35	Y₁= 2m₁-m₂-m₃	–5.11^ , * Significant at 1% and 5% probability;	–1.57ⁿ^s	0.37ⁿ^s
P30F35	Y₂= m₂-m₃	–2.47*	–0.66ⁿ^s	1.79ⁿ^s
DKB390	Y₁= 2m₁-m₂-m₃	–4.74^ , * Significant at 1% and 5% probability;	–0.51ⁿ^s	0.65ⁿ^s
DKB390	Y₂= m₂-m₃	–2.71*	0.32ⁿ^s	1.03ⁿ^s
DAS2B710	Y₁= m₁-m₂	–2.47*	1.53ⁿ^s	–0.31ⁿ^s
Impacto	Y₁= m₁-m₂	–3.71^ , * Significant at 1% and 5% probability;	–2.45*	–3.20*

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[1] *Corresponding author: andrea@iac.sp.gov.br