Effect of water deficit and sowing date on oil and protein contents in soybean co-inoculated with <i>Azospirillum brasilense</i>

Naoe, Alessandra Maria de Lima; Peluzio, Joênes Mucci; Campos, Leonardo José Motta; Naoe, Lucas Koshy; Reina, Evandro

doi:10.1590/1983-40632021v5166584

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Research Article • Pesqui. Agropecu. Trop. 51 • 2021 • https://doi.org/10.1590/1983-40632021v5166584 copy

Effect of water deficit and sowing date on oil and protein contents in soybean co-inoculated with Azospirillum brasilense

Efeito do déficit hídrico e épocas de semeadura nos teores de óleo e proteína em soja coinoculada com Azospirillum brasilense

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The soybean chemical composition is strongly influenced by genetic factors, as well as their interaction with the environment and management practices. Among the environmental factors, water deficit and temperature are those that most contribute to modify the chemical composition of beans, especially oil and protein contents. The present study aimed to assess the effects of co-inoculation with Azospirillum brasilense on soybean oil and protein contents. Two field experiments were carried out on different sowing dates. The design consisted of randomized blocks, in a split-split-plot arrangement, with four replications, including two irrigation depths (25 % and 100 % of the ETc), two inoculation methods [Bradyrhizobium japonicum (strains Semia 5079 and Semia 5080) and Azospirillum brasilense (strains AbV₅ and AbV₆ + Bradyrhizobium japonicum)] and two cultivars (ANTA 82 and TMG 132). The co-inoculation did not affect the oil and protein contents of beans for any of the assessed management conditions. The water deficit in the reproductive stage, combined with the sowing dates, altered the oil and protein contents in both the assessed cultivars, showing, respectively, a higher average protein and oil content in the beans for the cultivars TMG 132 and ANTA 82.

KEYWORDS:
Glycine max (L.) Merrill.; rhizobacteria; abiotic stress

I	-------------------------------- Oil content (%) --------------------------------
	------------ ANTA 82 ------------		------------ TMG 132 ------------
	D1	D2	D1	D2
I1	23.32 aA1^* * Averages followed by the same lowercase letter in the column (irrigation depths) and uppercase letter in the row (sowing dates) belong to the same statistical group by the Scott-Knott test at 5 % of significance; while averages followed by the same number in the row (cultivars) belong to the same statistical group by the Scott-Knott test at 5 % of significance. I1: irrigation depth 1 (100 % of the ETc); I2: irrigation depth 2 (25 % of the ETc); D1: date 1; D2: date 2.	23.49 bA1	22.02 aA1	20.45 aB2
I2	22.01 bB1	25.12 aA1	23.18 aA1	20.19 aB2

I	-------------------------------- Protein content (%) --------------------------------
	------------ ANTA 82 ------------		------------ TMG 132 ------------
	D1	D2	D1	D2
I1	38.09 bA2^* * Averages followed by the same lowercase letter in the column and uppercase letter in the row belong to the same statistical group by the Scott-Knott test at 5 % of significance; while averages followed by the same number in the row belong to the same statistical group by the Scott-Knott test at 5 % of significance. I1: irrigation depth 1 (100 % of the ETc); I2: irrigation depth 2 (25 % of the ETc); D1: date 1; D2: date 2.	39.46 aA2	40.17 aA1	41.94 aA1
I2	40.50 aA71	35.98 bB2	38.871 aB2	42.00 aA1

Escola de Agronomia/UFG Caixa Postal 131 - Campus II, 74001-970 Goiânia-GO / Brasil, 55 62 3521-1552 - Goiânia - GO - Brazil
E-mail: revistapat.agro@ufg.br

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[TFN1] ^*
Significant at 0.05 of probability according to the F-test;

[TFN2] ^ns
not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.

SV	DF	-------------- Mean square --------------
SV	DF	OC (%)	PC (%)
D	1	1.20^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	2.10^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
Block	3	0.06^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	0.12^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
Error 1	3	0.12^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	0.33^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
I	1	1.147^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	3.76^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
I x D	1	1.70^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	15.95^* * Significant at 0.05 of probability according to the F-test;
Error 2	6	0.34^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	0.87^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
IM	1	1.42^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	0.045^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
IM x I	1	5.65^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	6.65^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
IM x D	1	0.82^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	1.46^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
IM x I x D	1	0.48^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	1.02^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
Error 3	6	1.96^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	3.70^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
C	1	49.28**	59.25**
C x D	1	45.98**	49.51**
C x I	1	0.26^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	0.04^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
C x IM	1	0.11^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	0.00^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
C x D x I	1	14.30**	40.09**
C x IM x I	1	2.53^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	4.45^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
C x IM x D	1	0.29^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	0.15^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
Error 4	31	0.97^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.	2.16^ns ns not significant. SV: source of variation; DF: degree of freedom; CV: coefficient of variation.
CV₁ (%)		1.60	1.45
CV₂ (%)		2.62	2.37
CV₃ (%)		6.23	4.86
CV₄ (%)		4.40	3.71