Abstract
The Northeast region of Brazil is most affected by the reduction in water availability, contributing directly to the accumulation of salts at the soil surface. Therefore, this study aimed to evaluate the adaptive responses of Pennisetum glaucum and Pennisetum purpureum submitted to salinity. Seeds of two gramineous species, submitted to the saline treatment of 60 mM NaCl, were used in the nutrient solutions. K + absorption, accumulation of organic solutes and ions were measured as tolerance indicators. The experimental design was completely randomized, in a factorial 2x2 scheme ( P. glaucum and P. purpureum and two control treatments and saline stress). The soluble carbohydrate content as a response to salinity had a greater effect on P. purpureum plants grown in solution. Regard to the stress, the species that most stood out was P. purpureum , presenting a lower accumulation of salts, and increasing the carbohydrate content in the plant tissues, making the P. purpureum plants have a tolerance greater than P. glaucum .
Highlights
Salinity is a soil condition that occurs mainly in the arid and semi-arid regions of the world
In the FN of P. glaucum, the levels of K+ did not differed statistically in the two treatments (Figure 1A), this shows that the same plants subjected to stress saline maintained their levels of K+, the treatment saline compared with the control maintained a medium almost equal (Figure 1B)
In relation to the sheaths (Figure 1C), the levels of K+ in stress saline as well as in the aerial part presented no statistical differences compared with the control in the species P. glaucum and P. purpureum
Summary
Salinity is a soil condition that occurs mainly in the arid and semi-arid regions of the world. Several factors can lead to these processes as the restricted rainfall, low bioclimatic activity, low degree of rock weathering, insufficient drainage, high applied fertilizer rates and the use of poor quality water (which in many cases are rich in salts) Such factors promote the formation of soils with high salt concentration which causes concern for current agriculture. In Brazil, a greater importance in relation to this subject is given to the Northeastern backlands, where evapotranspiration overcomes precipitation and, makes it impossible to percolate the water through the profile and, soil salts leaching (Pedrotti et al, 2015). This represents a great challenge for agriculture. One of the alternatives proposed is the identification of crops or cultivars that are able to adapt or tolerate stress situations in which they can maintain their growth, development and production
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