Abstract
Research has shown that, in addition to the fungicidal action already known, strobilurins have positive physiological effects on the yield of some crops. Boscalid has also shown positive effects on plants, applied together or associated with strobilurin. The objective in this study was to evaluate the effect of fungicide application on growth and physiological behavior of coffee seedlings. The experimental design was in randomized blocks, with five replicates. There were five treatments: T1-Control, T2-Boscalid, T3-Pyraclostrobin, T4- Boscalid+ Pyraclostrobin and T5- Azoxystrobin applied in coffee seedlings. The application was at the “orelha de onça” stage (two round-shaped leaves), repeated every 15 days, counting 5 applications in total. Were evaluated shoot length, root length, stem diameter, shoot and root fresh matter, shoot and root dry matter, leaf photosynthesis, stomatal conductance, transpiration, intercellular CO2 concentration, water use efficiency and carboxylation efficiency. The application of fungicides promotes greater vegetative growth of coffee seedlings due to increased CO2 assimilation rate, reduced transpiration rates and increased water use efficiency, associated to the increased levels of auxin and cytokinins in leaves
Highlights
Coffee tree is a perennial plant of tropical climate that belongs to the Rubiaceae family and to the Coffea genus, which includes several species of great economic interest, Coffea arabica and Coffea canephora, with 70% and 30%, respectively, of the world production (ICO, 2018)
The other treatments with fungicides were similar to the control treatment (TABLE 2)
The stem diameter of coffee seedlings was influenced by the application of fungicides, and the seedlings that received the Boscalid+Pyraclostrobin treatment had the largest diameter (3.92 cm), 43% higher than the seedlings that did not receive any fungicide (TABLE 2)
Summary
Coffee tree is a perennial plant of tropical climate that belongs to the Rubiaceae family and to the Coffea genus, which includes several species of great economic interest, Coffea arabica and Coffea canephora, with 70% and 30%, respectively, of the world production (ICO, 2018). Kozlowski et al (2009) observed that bean plants treated with strobilurins in the absence of pathogenic fungi, had metabolic alterations that resulted in greater yield, besides being more vigorous The application of this fungicide presents positive results in relation to the increase in grain yield, as Rodrigues and Fioreze (2015) were based on the fact that strobilurins have an inhibitory effect on the activity of ACC synthase in maize plants, which is the key in ethylene (the hormone responsible for maize spike development) biosynthesis in the plant. The objective in this study was to evaluate the effect of fungicide application on growth and physiological behavior of coffee seedlings
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