The Potential Effects of Fungicides on Association of Rhizophagus irregularis with Maize and Wheat

Rejali, Farhad; Dolatabad, Hossein Kari; Safari, Marzieh; Abadi, Vahid Alah Jahandideh Mahjen

doi:10.1590/1678-4324-2022210304

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Article - Agriculture, Agribusiness and Biotechnology • Braz. arch. biol. technol. 65 • 2022 • https://doi.org/10.1590/1678-4324-2022210304 copy

The Potential Effects of Fungicides on Association of Rhizophagus irregularis with Maize and Wheat

Authorship SCIMAGO INSTITUTIONS RANKINGS

HIGHLIGHTS

The fungicides in the laboratory experiment impaired root colonization of R. irregularis.
In the greenhouse experiment, fungicides had no negative effect on root colonization of R. irregularis.
The benomyl in maize and tilt in wheat and rovral TS in both plants could be recommended with the combined application of R. irregularis.
Depending on fungicide type and host plant, the effect of fungicide on R. irregularis varies.

Abstract

The effect of different fungicides on mycorrhizal fungi should be investigated in different plants and environmental conditions. Thus, the purpose of this study was to appraise the effect of simultaneous fungicides application (including benomyl, rovral TS, mancozeb, and tilt) on the efficiency of Rhizophagus irregularis in cultivations of maize and wheat. This study was conducted in two separate experiments in the laboratory and greenhouse. The results of the laboratory stage showed that the use of all four fungicides significantly reduced the spore number compared to the conditions of non-use of the fungicide, although only rovral TS and mancozeb led to a significant reduction in root colonization percentage of R. irregularis. In the greenhouse, the benomyl significantly increased root dry weight in maize although tilt significantly reduced root colonization of maize with R. irregularis. The tilt and rovral TS had a positive effect and benomyl had a negative effect on wheat growth traits, but the root colonization of wheat with R. irregularis was not affected by fungicides. Generally, benomyl (2 g L^-1) in maize and tilt (2 mL L^-1) in wheat and rovral TS in both plants could be recommended with the combined application of R. irregularis inoculants. Therefore, depending on the type of fungicide and the host plant, the effect of the fungicide on colonization and association of mycorrhiza varies.

Keywords:
Fungicides; Mycorrhizal symbiosis; Root colonization; Sporulation

Soil texture		pH		EC		N	OC		P	K	Fe	Zn	Mn	Cu
				dS m^-1		%			mg kg^-1
Loam		7.7		1.01		0.07	0.72		7.9	233	2.16	0.46	7.88	1.02

Treatments		Root colonization (%)	No. of spore (No. in mL liquid)
No use of fungicides		68.87 a	81.00 a
Benomyl	0.5 g L^-1	57.12 ab	39.00 b
	1 g L^-1	63.37 a	31.20 bc
	2 g L^-1	57.55 ab	30.40 bc
	3 g L^-1	60.29 ab	39.00 b
Rovral TS	0.5 g L^-1	26.50 cd	8.00 cd
	1 g L^-1	25.52 cd	7.80 cd
	2 g L^-1	21.23 d	7.40 d
	3 g L^-1	18.89d	6.20 cd
Mancozeb	0.5 g L^-1	37.23 bcd	4.60 d
	1 g L^-1	17.64 d	2.00 d
	2 g L^-1	14.51 d	1.80 d
	3 g L^-1	15.49 d	1.40 d
Tilt	0.5 mL L^-1	50.60 ab	15.60 bcd
	1 mL L ^-1	51.13 ab	14.20 cd
	2 mL L ^-1	51.01 ab	12.00 cd
	3 mL L ^-1	46.33 abc	11.60 cd

Treatments	RF	RD	SF	SD	SL	Root colonization
Treatments	(g pot^-1)				(cm)	(%)
Control	20.95 a	2.42 b	71.73 a	21.44 a	91.29 a	40.96 ab
Benomyl	29.52 a	3.24 a	80.15 a	24.08 a	91.75 a	44.28 a
Rovral TS	22.06 a	2.36 b	80.96 a	22.48 a	88.25 ab	34.57 ab
Mancozeb	24.44 a	2.69 ab	75.28 a	20.49 a	90.20 ab	36.70 ab
Tilt	24.99 a	2.65 ab	69.14 a	21.53 a	86.41 b	30.16 b

Treatments	RF	RD	SF	SD	SL	Root colonization
Treatments	(g pot^-1)				(cm)	(%)
Control	6.77 a	0.86 ab	14.39 a	2.75 ab	51.08 bc	15.89 a
Benomyl	4.96 b	0.59 b	11.67 b	2.27 b	46.01 c	12.20 a
Rovral TS	5.80 ab	1.05 a	13.99 a	2.33 ab	57.58 a	16.90 a
Mancozeb	4.50 b	0.58 b	13.51 ab	2.76 ab	59.35 a	13.73 a
Tilt	7.29 a	0.95 a	12.55 ab	2.96 a	55.30 ab	19.93 a

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[1] *Correspondence: h.kari@areeo.ac.ir; Tel.: +98-26-36201900 (H.K.D.).