Soilless plant growth media influence the efficacy of phytohormones and phytohormone inhibitors.
Plant growth regulators, such as hormones and their respective biosynthesis inhibitors, are effective tools to elucidate the physiological function of phytohormones in plants. A problem of chemical treatments, however, is the potential for interaction of the active compound with the growth media sub...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2014-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC4259294?pdf=render |
| _version_ | 1818007216123281408 |
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| author | Norman B Best Thomas Hartwig Joshua S Budka Brandon J Bishop Elliot Brown Devi P V Potluri Bruce R Cooper Gnanasiri S Premachandra Cliff T Johnston Burkhard Schulz |
| author_facet | Norman B Best Thomas Hartwig Joshua S Budka Brandon J Bishop Elliot Brown Devi P V Potluri Bruce R Cooper Gnanasiri S Premachandra Cliff T Johnston Burkhard Schulz |
| author_sort | Norman B Best |
| collection | DOAJ |
| description | Plant growth regulators, such as hormones and their respective biosynthesis inhibitors, are effective tools to elucidate the physiological function of phytohormones in plants. A problem of chemical treatments, however, is the potential for interaction of the active compound with the growth media substrate. We studied the interaction and efficacy of propiconazole, a potent and specific inhibitor of brassinosteroid biosynthesis, with common soilless greenhouse growth media for rice, sorghum, and maize. Many of the tested growth media interacted with propiconazole reducing its efficacy up to a hundred fold. To determine the molecular interaction of inhibitors with media substrates, Fourier Transform Infrared Spectroscopy and sorption isotherm analysis was applied. While mica clay substrates absorbed up to 1.3 mg of propiconazole per g substrate, calcined clays bound up to 12 mg of propiconazole per g substrate. The efficacy of the gibberellic acid biosynthesis inhibitor, uniconazole, and the most active brassinosteroid, brassinolide, was impacted similarly by the respective substrates. Conversely, gibberellic acid showed no distinct growth response in different media. Our results suggest that the reduction in efficacy of propiconazole, uniconazole, and brassinolide in bioassays when grown in calcined clay is caused by hydrophobic interactions between the plant growth regulators and the growth media. This was further confirmed by experiments using methanol-water solvent mixes with higher hydrophobicity values, which reduce the interaction of propiconazole and calcined clay. |
| first_indexed | 2024-04-14T05:12:46Z |
| format | Article |
| id | doaj.art-9e89911694994a96bc05a54f908ac13c |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-14T05:12:46Z |
| publishDate | 2014-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-9e89911694994a96bc05a54f908ac13c2022-12-22T02:10:29ZengPublic Library of Science (PLoS)PLoS ONE1932-62032014-01-01912e10768910.1371/journal.pone.0107689Soilless plant growth media influence the efficacy of phytohormones and phytohormone inhibitors.Norman B BestThomas HartwigJoshua S BudkaBrandon J BishopElliot BrownDevi P V PotluriBruce R CooperGnanasiri S PremachandraCliff T JohnstonBurkhard SchulzPlant growth regulators, such as hormones and their respective biosynthesis inhibitors, are effective tools to elucidate the physiological function of phytohormones in plants. A problem of chemical treatments, however, is the potential for interaction of the active compound with the growth media substrate. We studied the interaction and efficacy of propiconazole, a potent and specific inhibitor of brassinosteroid biosynthesis, with common soilless greenhouse growth media for rice, sorghum, and maize. Many of the tested growth media interacted with propiconazole reducing its efficacy up to a hundred fold. To determine the molecular interaction of inhibitors with media substrates, Fourier Transform Infrared Spectroscopy and sorption isotherm analysis was applied. While mica clay substrates absorbed up to 1.3 mg of propiconazole per g substrate, calcined clays bound up to 12 mg of propiconazole per g substrate. The efficacy of the gibberellic acid biosynthesis inhibitor, uniconazole, and the most active brassinosteroid, brassinolide, was impacted similarly by the respective substrates. Conversely, gibberellic acid showed no distinct growth response in different media. Our results suggest that the reduction in efficacy of propiconazole, uniconazole, and brassinolide in bioassays when grown in calcined clay is caused by hydrophobic interactions between the plant growth regulators and the growth media. This was further confirmed by experiments using methanol-water solvent mixes with higher hydrophobicity values, which reduce the interaction of propiconazole and calcined clay.http://europepmc.org/articles/PMC4259294?pdf=render |
| spellingShingle | Norman B Best Thomas Hartwig Joshua S Budka Brandon J Bishop Elliot Brown Devi P V Potluri Bruce R Cooper Gnanasiri S Premachandra Cliff T Johnston Burkhard Schulz Soilless plant growth media influence the efficacy of phytohormones and phytohormone inhibitors. PLoS ONE |
| title | Soilless plant growth media influence the efficacy of phytohormones and phytohormone inhibitors. |
| title_full | Soilless plant growth media influence the efficacy of phytohormones and phytohormone inhibitors. |
| title_fullStr | Soilless plant growth media influence the efficacy of phytohormones and phytohormone inhibitors. |
| title_full_unstemmed | Soilless plant growth media influence the efficacy of phytohormones and phytohormone inhibitors. |
| title_short | Soilless plant growth media influence the efficacy of phytohormones and phytohormone inhibitors. |
| title_sort | soilless plant growth media influence the efficacy of phytohormones and phytohormone inhibitors |
| url | http://europepmc.org/articles/PMC4259294?pdf=render |
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