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Copyright of Progress in Plant Protection is the property of Institute of Plant Protection and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

• PGRs changed plant growth dynamics. • Trinexapac-ethyl, paclobutrazol, flurprimidol, mefluidide and ethephon reduced plant growth. • Gibberellic acid resulted in higher plant growth. • PGRs resulted in reduced mechanical strength parameters. • Mechanical traits depends on rate of paclobutrazol, flurprimidol and gibberellic acid. Plant growth regulators (PGRs) are widely used on sport turfgrass to reduce mowing frequency and inhibit seedhead formation. However, PGRs may also affect turf colour, density and wear tolerance. The objective of this study was to examine the effects of plant growth regulators on the mechanical properties of leaves of perennial ryegrass (Lolium perenne L.). A pot trial was conducted in three seasons in 2016-2018. Three cultivars were tested, 'Barlicum', 'Vulcanus', and 'Info'. Six different PGRs, trinexapac-ethyl, paclobutrazol, flurprimidol, mefluidide, ethephon and gibberellic acid, were applied at five different rates. An untreated control turfgrass was also tested for each cultivar. The turfgrass height was measured using a falling plate metre. The biomechanical parameters, i.e., strain-at-break, stress-at-break, modulus of elasticity and work-to-break, were determined using a tensile testing machine. All tested PGRs significantly changed plant growth dynamics. Trinexapac-ethyl, paclobutrazol, flurprimidol, mefluidide and ethephon application reduced plant growth. Gibberellic acid resulted in higher plant growth. This effect was usually observed at 7, 14 and 21 days after PGR application. Perennial ryegrass leaves under tensile stress exhibited a characteristic behaviour with a nearly linear initial period followed by a decrease in the stress rate under a constant strain rate. All PGRs resulted in reduced mechanical strength parameters, namely, stress-at-break and modulus of elasticity. Gibberellic acid also resulted in lower strain-at-break. The work-to-break parameter was affected by all PGRs except ethephon. The PGRs application rate significantly affected certain mechanical parameters only when paclobutrazol, flurprimidol and gibberellic acid were used. [ABSTRACT FROM AUTHOR]

Highlights: [•] The salt concentration of 150mM limits Miscanthus growth. [•] The salt tolerance of Miscanthus depends strongly on the initial FW of rhizomes. [•] The changes FW and DW of roots and leaves most reflect salt response of Miscanthus. [•] High accumulation of K and proline in the leaves decide Miscanthus salt tolerance. [ABSTRACT FROM AUTHOR]