Light availability in the cultivation environment and the action of glyphosate on Digitaria insularis: physiological aspects and herbicide root exudation

The root exudation decreases the susceptibility of some species to herbicides, which is still little studied in Digitaria insularis, popularly known as sourgrass, one of the main weeds of annual crops in the world. Thus, we sought to identify whether there is an occurrence of root exudation of glyph...

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Published in:Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2022, Vol.57 (7), p.597-607
Main Authors: Barros, Rodrigo Eduardo, Mendes Reis, Matheus, Tuffi Santos, Leonardo David, Fagundes Correia, Jéssica, Fernandes de Souza, Richardson
Format: Article
Language:English
Subjects:
Cultivation
Design of experiments
Digitaria
Digitaria insularis
Electron transport
electron transport rate
Experimental design
Exudation
Glycine - analogs & derivatives
Glyphosate
Herbicide Resistance
Herbicides
Herbicides - pharmacology
Photochemicals
Photosynthesis
Photosynthetic rate
Photosystem II
Physiology
root exudation
Shading
sourgrass
Stomata
Stomatal conductance
Transpiration
Transport rate
Water use
Water use efficiency
Weed Control
weed management
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Summary:The root exudation decreases the susceptibility of some species to herbicides, which is still little studied in Digitaria insularis, popularly known as sourgrass, one of the main weeds of annual crops in the world. Thus, we sought to identify whether there is an occurrence of root exudation of glyphosate in D. insularis and the influence of this herbicide on physiological and control parameters of this species when cultivated under different light conditions. The experimental design was 2 x 5, with the first factor represented by environments: full sun and artificial shading. The second factor was represented by doses 0, 370, 740, 1110, and 1480 g ha −1 of glyphosate. The plants grown in shading showed more significant injury in the initial phase. The increase in the glyphosate doses reduced the photochemical efficiency of the photosystem II (ФPSII), electron transport rate (ETR), photosynthetic rate, stomatal conductance, transpiration rate, and water use efficiency of D. insularis regardless of the cultivation environment. The light restriction increased the ФPSII in D. insularis at three days after applying the herbicide (DAH); at 6 DAH, the shaded plants showed a more pronounced reduction in ФPSII. D. insularis did not show root exudation of glyphosate, and shading did not influence this process.
ISSN:0360-1234
1532-4109
DOI:10.1080/03601234.2022.2088198