Abstract
The objective of the research was to evaluate the effects of saline stress on the initial growth and physiological parameters of three varieties of cotton plants, being two cultivars of colored fiber (BRS Topazio and BRS Verde) and one of white fiber (BRS 286). The experiment was conducted under greenhouse conditions. After chemical depletion with sulfuric acid, five seeds were seeded in polyethylene pots of 20 kg, leaving only one plant per pot after thinning. The experimental design was completely randomized, with a factorial scheme of 3 × 5, with five replications, totaling 75 plots, being three cotton varieties and five saline stress treatments—1.1; 3.1; 5.1; 7.1; 9.1 dS m−1. The evaluations occurred at 15 and 30 days after the beginning of the treatments (DAT) for growth variables (plant height, stem diameter, number of leaves and leaf area) and gas exchange (stomatal conductance, net photosynthesis rate and transpiration. The variety that was most resistant to the salt stress levels studied was BRS 286, followed by BRS Topazio and BRS Verde.
Highlights
Salinity caused by the excessive concentration of salts in the soil solution, or even in the waters used for irrigation, is considered an abiotic stress limiting the growth and production of plants [1]
The objective of the research was to evaluate the effects of saline stress on the initial growth and physiological parameters of three varieties of cotton plants, being two cultivars of colored fiber (BRS Topázio and BRS Verde) and one of white fiber (BRS 286)
This was due to the reduction of water absorption by the roots of the plant, due to the accumulation of salts in the soil solution, which reduces its osmotic potential and, its water potential, making water absorption difficult
Summary
Salinity caused by the excessive concentration of salts in the soil solution, or even in the waters used for irrigation, is considered an abiotic stress limiting the growth and production of plants [1]. Due to resistance to low rainfall and moderate levels of salinity, colored cotton has great importance in the semi-arid region It is a crop used in the production of textiles due to the non-use of dyes or other chemical derivatives, adding more value to the finished product [8]. This research had as objective to evaluate the initial growth, chlorophyll and the variables of gas exchange of different cotton cultivars, when submitted to saline stress
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