Abstract
The objective of this work was to evaluate the effects on the physiological attributes of soybean seeds submitted to the seed treatment with addition of insecticide, polymers and micronutrients throughout the storage. The experimental design was completely randomized in a factorial scheme, with four seed treatments per two seasons of storage of the seeds. The analysis of variance revealed a significant interaction among seed treatments and storage times for both cultivars at 5% of probability, referring to the characteristics of shoot length (SL), primary root length (RL), shoot dry mass (SDM) and dry mass of the primary root (RDM) for the cultivar Fundacep 37 RR. Addition of seed treatments influences the physiological performance of seedlings originated from soybean seeds stored for 240 days. The shoot and primary root lenghts, and shoot dry mass express the isoenzyme esterase through the aerial part and primary root of the seedling, the malate dehydrogenase is expressed in the primary root while in the peroxidase it is evident in the shoot of the seedlings.
Highlights
The soybean (Glycine max (L.) Merrill) belongs to the Fabaceae family being characterized as one of the main oleaginous plants produced worldwide, due to its economic importance and nutritional quality coupled with high crude protein concentration (Follmann et al, 2014)
The analysis of variance revealed a significant interaction among seed treatments and storage times for both cultivars at 5% of probability, referring to the characteristics of shoot length (SL), primary root length (RL), shoot dry mass (SDM) and dry mass of the primary root (MR) for the cultivar Fundacep 37 RR
The primary root lenght (RL) showed superiority through the use of Thiametoxam and polymer referring to Fepagro 37 RR cultivar, this insecticide may have stimulated the initial growth of these seedlings (Almeida et al, 2012; Kavalco et al, 2015)
Summary
The soybean (Glycine max (L.) Merrill) belongs to the Fabaceae family being characterized as one of the main oleaginous plants produced worldwide, due to its economic importance and nutritional quality coupled with high crude protein concentration (Follmann et al, 2014). In Brazil, it is evidenced as the most cultivated species in the most varied agricultural regions, which provided an increase of 12.18% in national production for the 2016/2017 crop season (Conab, 2017) These increases are due to the technological advances and seed quality used that directly influence the performance and establishment of the plants in the field (Ferrari et al, 2014; Meira et al, 2016). Before the seeds are used in the field, they are submitted to certain periods of storage where some peculiar situations the seeds have been treated and exposed to stresses, that will contribute to reduce or maintain the physiological quality of the seeds Among these treatments, the use of insecticides conjugated to polymers, fungicides and micronutrients (Pereira et al, 2005; Karam et al, 2007; Carvalho et al, 2015; Zanatta et al, 2018) stands out. The use of insecticides in the seed treatment in combination with polymers and micronutrients may increase seedling uniformity, change the field emergence, provide conditions for the seeds to express their maximum vigor (Follmann et al, 2014), on the other hand, some products used may compromise the emergence of seedlings (Souza et al, 2015; Szareski et al, 2015)
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