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Proteins and Metabolites Regulated by Trinexapac-ethyl in Relation to Drought Tolerance in Kentucky Bluegrass

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Abstract

Plants have developed various mechanisms in adaptation to water deficit stress, including growth retardant to reduce water loss. Previous studies reported that plants treated with a growth inhibitor, trinexapac-ethyl (TE), had improved drought tolerance. The objective of this study was to determine alterations in proteins and metabolite accumulation associated with drought tolerance improvement in a perennial grass species, Kentucky bluegrass (Poa pratensis), induced by TE application. Plants were treated with TE [1.95 ml l−1 (v:v); a.i. TE = 0.113%] through foliar spray for 14 days, and then subjected to drought stress by withholding irrigation for 15 days in growth chambers. TE-treated plants exhibited significantly higher relative water content and photosynthetic capacity and lower membrane leakage than nontreated plants under drought stress, suggesting TE-enhanced drought tolerance in Kentucky bluegrass. Physiological improvement in drought tolerance through TE application was associated with the increased accumulation of various proteins and metabolites, including ferritin, catalase, glutathione-S-transferase, Rubisco, heat shock protein 70, and chaperonin 81, as well as fatty acids (palmitic acid, α-linolenic acid, linoleic acid, and octadecanoic acid). Our results suggest that TE may regulate metabolic processes for antioxidant defense, protective protein synthesis, photorespiration, and fatty acid synthesis, and thereby contribute to better drought tolerance in Kentucky bluegrass.

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Acknowledgments

The authors thank Emily Merewitz, David Jespersen, and Patrick Burgess for critical review of the manuscript. Thanks also go to Rutgers Center of Turfgrass Science for funding support of this project.

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  1. Department of Plant Biology and Pathology, Rutgers University, New Brunswick, NJ, 08901, USA

    Chenping Xu & Bingru Huang

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  1. Chenping Xu
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Correspondence to Bingru Huang.

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Xu, C., Huang, B. Proteins and Metabolites Regulated by Trinexapac-ethyl in Relation to Drought Tolerance in Kentucky Bluegrass. J Plant Growth Regul 31, 25–37 (2012). https://doi.org/10.1007/s00344-011-9216-x

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