Abstract
The objective of this study was to evaluate the photosynthetic and physiological parameters of soybean plants under water deficit after imbibition in different concentrations of salicylic acid during germination. The initial seed quality of the cultivar Bayer®/Tec Irga 6070 RR was evaluated. The soybean seeds were soaked in 25 ml in the salicylic acid solution (SA) for 24 hours and the retention capacities of 30, 50 and 70% were adopted. Under controlled conditions, concentrations of zero, 250, 500, 750 and 1000 µM, evaluating the variables length, fresh and dry mass of root and shoot. In the greenhouse, the concentrations of SA of zero, 500 and 1000 µM were used. After 29 days of the seedling, the stomatal conductance, length, fresh and dry mass of root and shoot were evaluated. The results showed that the uptake of SA in the germination aided seedlings under water deficit. The retention capacity of 30% simulated the water deficit, damaging the physiological parameters of soybean seedlings in both environments. The concentrations of 500 and 1000 µM of SA were efficient in the water deficit for the variables root length, fresh and dry shoot mass.
Highlights
Soybean production has global economic importance in agribusiness, and, in order to guarantee safety and production increase, it is necessary to use different techniques and management practices
In order to aid in this process, the plant hormone salicylic acid (SA) plays an essential role in relation to biotic and abiotic stresses, an aspect explored by different researches
Commercial soybean seeds of cultivar Bayer®/Tec Irga 6070 RR produced in the 2015/2016 crop was used, which is recommended for cultivation in the state of Rio Grande do Sul
Summary
Soybean production has global economic importance in agribusiness, and, in order to guarantee safety and production increase, it is necessary to use different techniques and management practices In addition to these aspects, the beginning of a crop will have its uniformity determined by the use of seeds with high physiological potential, among other aspects (Marcos Filho, 2015b). Among the most common stresses, water deficit is considered one of the major causes of crop losses, especially in critical stages of development, such as germination and seedling establishment (El Sabagh et al, 2015) This stress promotes morphological, physiological and biochemical changes resulting in oxidative stress and formation of reactive oxygen species (ROS) (El Sabagh et al, 2019). SA is responsible for important biochemical and physiological processes, such as growth and development, stomatal closure and nutrient absorption (Hayat, 2010; Janda et al, 2014; Miura & Tada, 2014; Vazirimehr & Rigi, 2014; Parmoon et al, 2017)
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