Abstract
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.
Highlights
Soybean is an important source of oil and protein for human and animal nutrition (Hartman et al 2011)
The soybean chemical composition is expressed genetically, environmental factors influence the concentration of components (Wang et al 2015)
The present study aimed to assess the effects of co-inoculation with Azospirillum brasilense on oil and protein contents, for two soybean cultivars submitted to water deficit on two sowing dates
Summary
Soybean is an important source of oil and protein for human and animal nutrition (Hartman et al 2011). Its seeds contain about 40 % of protein and 20 % of oil, accounting for 70 % of the world protein from flour and 29 % of vegetable oil consumption (ASA 2018). The soybean chemical composition is expressed genetically, environmental factors influence the concentration of components (Wang et al 2015). Water deficit has been indicated as a decisive factor in the dynamics of forming and accumulating reserves in the seeds. Mertz-Henning et al (2018) observed that drought conditions during the reproductive phase of soybean seeds favor an increase in the protein content and a decrease in the oil content. Ghassemi-Golezani & Lotfi (2013) had similar Mertz-Henning et al (2018) observed that drought conditions during the reproductive phase of soybean seeds favor an increase in the protein content and a decrease in the oil content. Ghassemi-Golezani & Lotfi (2013) had similar
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