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Response of Stylosanthes humilis seeds to 2,4-dichlorophenoxyacetic acid

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A study was carried out to investigate the mode of action of 2,4-dichlorophenoxyacetic acid (2,4-D) on germination of seeds of Stylosanthes humilis, an annual tropical forage legume. 2,4-D inhibited S. humilis seeds germination in a dose-dependent manner, with a correspondingly low ethylene production by the seeds. Significant decreases in tricarboxylic acid (TCA) cycle intermediates and amino acids were also observed in seeds incubated with 2,4-D. Notably, the effects of 2,4-D on TCA cycle intermediates and amino acids levels were reverted following transfer of the seeds to 1-aminocyclopropane-1-carboxylic acid (ACC). Furthermore, ethylene production and germination of S. humilis seeds increased following transfer from 2,4-D solution to ACC solution, but not after transfer to deionised water. Together, these combined experiments suggest that 2,4-D inhibited the germination of S. humilis seeds through inhibition of ethylene biosynthesis. These responses were associated with an extensive reprogramming of primary metabolism.
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Document Type: Research Article

Publication date: April 1, 2017

This article was made available online on February 1, 2017 as a Fast Track article with title: "Response of Stylosanthes humilis seeds to 2,4-dichloro­phenoxy­acetic acid".

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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