Physiological and Molecular Mechanisms of Differential Sensitivity of Palmer Amaranth (Amaranthus palmeri) to Mesotrione at Varying Growth Temperatures

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dc.contributor.author Godar, A. S.
dc.contributor.author Varanasi, V. K.
dc.contributor.author Nakka, S.
dc.contributor.author Vara Prasad, P.V.
dc.contributor.author Thompson, Curtis R.
dc.contributor.author Jugulam, Mithila
dc.date.accessioned 2016-03-30T01:38:06Z
dc.date.available 2016-03-30T01:38:06Z
dc.identifier.uri http://hdl.handle.net/2097/32209
dc.description Citation: Godar, A. S., Varanasi, V. K., Nakka, S., Prasad, P. V. V., Thompson, C. R., & Mithila, J. (2015). Physiological and Molecular Mechanisms of Differential Sensitivity of Palmer Amaranth (Amaranthus palmeri) to Mesotrione at Varying Growth Temperatures. Plos One, 10(5), 17. doi:10.1371/journal.pone.0126731
dc.description Herbicide efficacy is known to be influenced by temperature, however, underlying mechanism(s) are poorly understood. A marked alteration in mesotrione [a 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor] efficacy on Palmer amaranth (Amaranthus palmeri S. Watson) was observed when grown under low- (LT, 25/15 degrees C, day/night temperatures) and high (HT, 40/30 degrees C) temperature compared to optimum (OT, 32.5/22.5 degrees C) temperature. Based on plant height, injury, and mortality, Palmer amaranth was more sensitive to mesotrione at LT and less sensitive at HT compared to OT (ED50 for mortality; 18.5, 52.3, and 63.7 g ai ha(-1), respectively). Similar responses were observed for leaf chlorophyll index and photochemical efficiency of PSII (F-v/F-m). Furthermore, mesotrione translocation and metabolism, and HPPD expression data strongly supported such variation. Relatively more mesotrione was translocated to meristematic regions at LT or OT than at HT. Based on T-50 values (time required to metabolize 50% of the C-14 mesotrione), plants at HT metabolized mesotrione faster than those at LT or OT (T-50; 13, 21, and 16.5 h, respectively). The relative HPPD: CPS (carbamoyl phosphate synthetase) or HPPD:beta-tubulin expression in mesotrione-treated plants increased over time in all temperature regimes; however, at 48 HAT, the HPPD:beta-tubulin expression was exceedingly higher at HT compared to LT or OT (18.4-, 3.1-, and 3.5-fold relative to untreated plants, respectively). These findings together with an integrated understanding of other interacting key environmental factors will have important implications for a predictable approach for effective weed management.
dc.relation.uri https://doi.org/10.1371/journal.pone.0126731
dc.rights Attribution 4.0 International (CC BY 4.0)
dc.rights.uri http://creativecommons.org/licenses/by/4.0/
dc.subject Soybeans Glycine-Max
dc.subject Relative-Humidity
dc.subject Herbicide Resistance
dc.subject Gene-Expression
dc.subject Rapid Evolution
dc.subject Lolium-Rigidum
dc.title Physiological and Molecular Mechanisms of Differential Sensitivity of Palmer Amaranth (Amaranthus palmeri) to Mesotrione at Varying Growth Temperatures
dc.type Article
dc.date.published 2015
dc.citation.doi 10.1371/journal.pone.0126731
dc.citation.issn 1932-6203
dc.citation.issue 5
dc.citation.jtitle PLoS One
dc.citation.spage 17
dc.citation.volume 10
dc.contributor.authoreid vara
dc.contributor.authoreid cthompso
dc.contributor.authoreid mithila


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