Abstract
Abstract: This study aimed to verify the effect of seeds treated with thiamethoxam on the emergence, growth and chlorophyll content of seedlings of two cotton cultivars subjected to abiotic stress. The seeds used were from the DeltaOpal and NuOpal cultivars, each one represented by three lots, previously subjected to determination of moisture content, germination and vigor (low temperature germination). Then, the seeds from each lot, treated with thiamethoxam at a dose of 600 mL of product per 100 kg-1 seed or not, were exposed to temperature (18, 25 and 35 °C) and water availability (40, 60 and 80%) stress conditions. The emergence percentage, the root and shoot length, and the chlorophyll content were evaluated. The growth of cotton seedlings from the DeltaOpal and NuOpal cultivars, subjected to low temperature conditions and water availability of 40 to 60%, is favored by seed treatment with thiamethoxam. Seed treatment with thiamethoxam increases chlorophyll content during the development of cotton plants.
Highlights
In order to be successful in a crop, it is important to gather conditions that allow the plant to express all its productive potential
Knowing the risks of stress by temperature and humidity that a cotton crop is subjected to and the potential benefits that the seeds treatment with thiamethoxam may provide, the objective of this paper was to verify the effect of seeds treatment with this bioactivator on the emergence, growth and chlorophyll content of seedlings from two cultivars of cotton subjected to abiotic stress
The solution volume was 1.3 L. 100 kg-1 of seeds. Before submitting it to different stresses, we proceeded to the characterization of the quality of the lots by the following tests: a) water content: it was determined with two subsamples of 5 g in an oven, at 105 oC ± 3 oC for 24 hours (Brasil, 2009); b) germination: done with four replications of 200 seeds, one of the replications being formed by two rolls of 100 seeds each, amounting to 800 seeds for each cultivar, sowed in moistened paper towels with the amount of water equivalent to 2.5 times its dry mass, remaining in a germinator at 25 °C
Summary
In order to be successful in a crop, it is important to gather conditions that allow the plant to express all its productive potential Abiotic stresses such as inappropriate and dry temperatures can significantly reduce crop yield and restrict planting in regions where commercially important species can be grown (Vaz de Melo et al, 2012). According to Ávila et al (2007), insufficient water availability in the soil has been considered one of the most common causes of low emergence of seedlings in the field. Regarding temperature, both low and high temperatures can enable soaking but not continue with growth of the embryo and the establishment of the seedling, preventing the conclusion of the process (Taiz and Zeiger, 2004). According to Thakur et al (2010) and Szabados et al (2011), the stress caused by suboptimal and above optimal temperatures alters cellular homeostasis, causes severe delay in plant growth and development and, in many cases, leads to programmed senescence
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
