Effects of 2,4-D iso-octyl ester on the morphology, chlorophyll content and dry mass of lettuce and tomato seedlings
Year: 1992
Type: article
Abstract: Tomato and lettuce seedlings were exposed to 1 or 3 mm of simulated rainfall containing the auxin-type herbicide 2,4-D iso-octyl ester. They were then evaluated weekly for damage according to symptoms and chlorophyll content. In addition, dry matter production was determined at the end of the three- week growth period. The herbicide threshold concentration for causing the symptoms ‘stem, leaf and petiole bending’ on tomato seedlings and ‘duck's foot-type leaves’ on lettuce seedlings was found to be 10 pg L−1. Significant reduction of the dry mass of the above-ground plant parts began with 10 ng L−1 of the herbicide. Further dry mass seems the only parameter measured that is sensitive to application volume. There was a significant decrease in chlorophyll content at 10 mg L−1 of the herbicide. It was deduced that neither chlorophyll content nor dry mass can be used as markers for auxin-type herbicide damage.
Authors: H. R. Meinhardt, L. P. van Dyk
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2069852689