Action of Imazethapyr and Lactofen on the Nodulation of Conventional and Transgenic Soybean under Drought Stress Conditions

GONÇALVES, C.G.; SILVA JUNIOR, A.C.; SCARANO, M.; PEREIRA, M.R.R.; MARTINS, D.

doi:10.1590/S0100-83582018360100061

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Article • Planta daninha 36 • 2018 • https://doi.org/10.1590/S0100-83582018360100061 copy

Action of Imazethapyr and Lactofen on the Nodulation of Conventional and Transgenic Soybean under Drought Stress Conditions

Ação do Imazethapyr e Lactofen na Nodulação da Soja Convencional e Transgênica sob Condições de Déficit Hídrico

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

This research aimed at studying the action of the herbicides imazethapyr and lactofen on the root system and rhizobium/plant interaction, when they are sprayed at two phenological development stages of soybean cultivars under different soil water management. The soybean cultivars MG/BR 46 Conquista (conventional) and BRS Valiosa (RR) were submitted to three minimum soil water potential (Ψs): -0.03; -0.07 and -0.5 MPa at the V2 and V4 phenological stages. The herbicides imazethapyr at the rate (100 g a.i. ha-1) and lactofen at the rate (180 g a.i. ha-1) were sprayed 10 days after the start of water restrictions. Twenty-one days after the application of the herbicides, root dry matter and root nodulation were evaluated. The BRS Valiosa (RR) soybean cultivar presented better nodule formation and a more efficient and more adapted root system to support moderate drought stress conditions (-0.07 MPa). The MG/BR 46 Conquista (conventional) soybean cultivar presented lower the root system growth when submitted to the spraying of imazethapyr and lactofen. The activity of N2-fixating bacteria was affected by the spraying of the herbicides imazethapyr and lactofen.

Keywords:
ALS; Glycine max; phytotoxification; PROTOX; symbiotic fixation of N2

Sociedade Brasileira da Ciência das Plantas Daninhas Departamento de Fitotecnia - DFT, Universidade Federal de Viçosa - UFV, 36570-000 - Viçosa-MG - Brasil, Tel./Fax::(+55 31) 3899-2611 - Viçosa - MG - Brazil
E-mail: rpdaninha@gmail.com

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[1] * Corresponding author: <goncalvescg.agro@hotmail.com>

Condition	Root dry matter (g)
	V2		V4
	imazethapyr	lactofen	imazethapyr	lactofen
	Cultivar
Conventional	0.38 a	0.44 a	1.22 a	1.32 a
RR	0.40 a	0.42 a	1.04 b	1.05 b
	Water Management (MPa)
-0.03	0.60 a	0.67 a	2.20 a	2.25 a
-0.07	0.40 b	0.42 b	0.86 b	0.98 b
-0.50	0.17 c	0.19 c	0.34 c	0.33 c
	Herbicide
With	0.35 b	0.42 a	0.87 b	0.98 b
Without	0.43 a	0.44 a	1.39 a	1.39 a
F Cultivar (C)	0.81^ns	0.48^ns	6.23*	15.30**
Water management (M)	99.58**	167.52**	240.67**	278.29**
Herbicide (H)	12.03**	0.30^ns	52.72**	37.30**
(C) x (M)	1.05^ns	1.48^ns	11.85**	12.80**
(C) x (H)	4.35*	0.07^ns	26.44**	17.32**
(M) x (H)	2.39^ns	0.15^ns	24.23**	25.77**
(C) x (M) x (H)	0.03^ns	0.03^ns	15.32**	16.71**
VC (%)	21.8	17.3	21.8	19.7
s.m.d. (C)/(H)	0.05	0.04	0.14	0.14
s.m.d. (M)	0.07	0.06	0.21	0.2

Interaction	Root dry matter (g)
	V2				V4
	Imazethapyr		Lactofen		Imazethapyr		Lactofen
Water management (MPa)	Cultivar
Water management (MPa)	Conv.	RR	Conv.	RR	Conv.	RR	Conv.	RR
-0.03	-	-	-	-	2.52 aA	1.88 aB	2.62 aA	1.88 aB
-0.07	-	-	-	-	0.77 bA	0.96 bA	0.97 bA	1.00 bA
-0.50	-	-	-	-	0.38 cA	0.29 cA	0.37 cA	0.28 cA
s.m.d. (Line)	-		-		0.30		0.29
s.m.d. (Column)	-		-		0.25		0.24
Cultivar	Herbicide
Cultivar	With	Without	With	Without	With	Without	With	Without
Conventional	0.31 bB	0.45 aA	-	-	0.78 aB	1.66 aA	0.97 aB	1.66 aA
RR	0.38 aA	0.42 aA	-	-	0.97 aA	1.12 bA	0.99 aA	1.12 bA
d.m.s. (Line)/(Column)	0.07		-		0.20		0.19
Water Management	Herbicide
Water Management	With	Without	With	Without	With	Without	With	Without
-0.03	-	-	-	-	1.60 aB	2.80 aA	1.69 aB	2.80 aA
-0.07	-	-	-	-	0.69 bB	1.04 bA	0.93 bA	1.04 bA
-0.50	-	-	-	-	0.33 cA	0.35 cA	0.31 cA	0.35 cA
s.m.d. (Line)	-		-		0.25		0.24
s.m.d. (Column)	-		-		0.30		0.29

Condition	N. Nodules
	V2⁽¹⁾		V4
	Imazethapyr	Lactofen	Imazethapyr	Lactofen
	Cultivar
Conventional	0.90 a	1.24 a	36.25 a	46.08 a
RR	0.72 a	0.47 b	42.33 a	45.04 a
	Water Management (MPa)
-0.03	2.44 a	2.57 a	95.94 a	109.50 a
-0.07	0.00 b	0.00 b	19.13 b	24.50 b
-0.5	0.00 b	0.00 b	2.81 c	2.69 c
	Herbicide
With	0.38 b	0.48 b	28.75 b	41.71 a
Without	1.24 a	1.24 a	49.83 a	49.42 a
F Cultivar (C)	1.90^ns	59.27**	3.60^ns	0.71^ns
Water Management (M)	154.40**	294.43**	321.19**	648.87**
Herbicide (H)	42.96**	58.46**	43.30**	28.25**
(C) x (M)	1.90^ns	59.27**	1.97^ns	5.03*
(C) x (H)	9.76**	3.29^ns	7.18*	7.46**
(M) x (H)	42.96**	58.46**	15.87**	22.96**
(C) x (M) x (H)	9.76**	3.29*	11.83**	8.11**
VC (%)	55.80	40.38	28.30	23.31
s.m.d. (C)/(H)	0.27	0.20	6.50	8.49
s.m.d. (M)	0.39	0.30	9.58	12.51

Interaction	N. Nodules
	V2⁽¹⁾				V4
	Imazethapyr		Lactofen		Imazethapyr		Lactofen
W. Manag. (MPa)	Cultivar
W. Manag. (MPa)	Conv.	RR	Conv.	RR	Conv.	RR	Conv.	RR
-0.03	-	-	3.73 aA	1.42 Ab	-	-	117.38 aA	101.63 aB
-0.07	-	-	0.00 bA	0.00 bA	-	-	17.63 bA	31.38 bA
-0.50	-	-	0.00 bA	0.00 bA	-	-	3.25 bA	2.13 cA
s.m.d. (Line)	-		0.42		-		17.69
s.m.d. (Column)	-		0.35		-		14.7
Cultivar	Herbicide
	With	Without	With	Without	With	Without	With	Without
Conventional	0.27 aB	1.54 aA	-	-	21.42 bB	51.08 aA	-	-
RR	0.50 aB	0.95 bA	-	-	36.08 aB	48.59 aA	-	-
s.m.d. (Line)/(Column)	0.38		-		9.2		-
Water Management	Herbicide
	With	Without	With	Without	With	Without	With	Without
-0.03	1.15 aB	3.72 aA	1.43 aB	3.72 aA	73.38 aB	118.50 aA	-	-
-0.07	0.00 bA	0.00 bA	0.00 bA	0.00 bA	10.88 bB	27.38 bA	-	-
-0.50	0.00 bA	0.00 bA	0.00 bA	0.00 bA	2.00 bA	3.63 cA	-	-
s.m.d. (Line)	0.46		0.35		11.26		-
s.m.d. (Column)	0.55		0.42		13.55		-

Condition	Nodule DM
	V2⁽¹⁾		V4
	Imazethapyr	Lactofen	Imazethapyr	Lactofen
	Cultivar
Conventional	0.02 a	0.027 a	0.11 a	0.13 a
RR	0.01 b	0.007 b	0.12 a	0.14 a
	Water Management (MPa)
-0.03	0.05 a	0.51 a	0.33 a	0.37 a
-0.07	0.00 b	0.00 b	0.03 b	0.039 b
-0.5	0.00 b	0.00 c	0.01 b	0.001 c
	Herbicide
With	0.009 b	0.009 b	0.08 b	0.11 b
Without	0.025 a	0.025 a	0.16 a	0.16 a
F Cultivar (C)	7.24*	44.40**	1.48^ns	0.71^ns
Water Management (M)	120.10**	137.40**	554.32**	648.87**
Herbicide (H)	25.35**	34.01**	78.81**	28.25**
(C) x (M)	7.24**	44.40**	0.10^ns	5.03*
(C) x (H)	16.69**	0.60^ns	9.73**	7.46**
(M) x (H)	25.35**	34.01**	48.98**	22.96**
(C) x (M) x (H)	16.69**	0.60^ns	18.05**	8.11**
VC (%)	63.2	59.11	26.18	23.31
s.m.d. (C)/(H)	0.006	0.006	0.02	0.02
s.m.d. (M)	0.010	0.009	0.03	0.03