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DOI:10.21273/JASHS.140.4.346
Web URL(s):https://journals.ashs.org/jashs/view/journals/jashs/140/4/article-p346.xml
    Last checked: 04/30/2020
https://journals.ashs.org/jashs/downloadpdf/journals/jashs/140/4/article-p346.xml
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Publication Type:
i
Refereed
Author(s):Krishnan, Sanalkumar; Merewitz, Emily B.
Author Affiliation:Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI
Title:Phytohormone responses and cell viability during salinity stress in two creeping bentgrass cultivars differing in salt tolerance
Source:Journal of the American Society for Horticultural Science. Vol. 140, No. 4, July 2015, p. 346-355.
Publishing Information:Geneva, New York: The American Society for Horticultural Science
# of Pages:10
Keywords:TIC Keywords: Agrostis stolonifera; Cell growth; Comparisons; Cultivar evaluation; Cultivar variation; Effluent water; Plant growth regulators; Salinity stress; Salt tolerance
Cultivar Names:Mariner; Penncross
Abstract/Contents:"Salinity stress is becoming more prevalent in turfgrass management with the increasing use of recycled water for irrigation. Creeping bentgrass (Agrostis stolonifera) is a cool-season turfgrass species that contains significant cultivar variation in salt stress tolerance, but the mechanism related to this cultivar variation is not well understood. Our objectives were to determine whether differential hormone content could play a role in cultivar variation of salt responses and to evaluate whether cell viability assays using dye techniques could differentiate salt stress damage levels in turfgrass species. Therefore, a growth chamber study with potted plants was conducted to evaluate salt ion concentrations, physiological responses, and hormone analysis [abscisic acid (ABA), indole-3-acetic acid (IAA), jasmonic acid (JA), salicylic acid (SA), zeatin riboside (ZR), and ethylene] at 4, 8, and 12 dSā€¢m-1 in relatively salt-tolerant 'Mariner' compared with salt-sensitive 'Penncross' creeping bentgrass. A hydroponics-based growth chamber study was performed for evaluation of whether dead-cell stains coupled with image analysis could be a quick method for indicating cell viability variation between cultivars. Greater salt tolerance was evident in 'Mariner' at 12 dSā€¢m-1 , which showed significantly lower electrolyte leakage, higher leaf relative water content (RWC), osmotic potential, photochemical efficiency, and photochemical yield compared with 'Penncross'. A higher K+ and lower Na+ content was maintained in leaves of 'Mariner' compared with 'Penncross' while roots of 'Mariner' maintained higher Ca2+ content under stressed and nonstressed conditions. Phytohormone levels showed a decline in salt-stressed roots compared with nonstressed plants but 'Mariner' roots were able to maintain levels higher than 'Penncross'. 'Mariner' leaves showed an increased accumulation of ABA, JA, SA, and ZR while roots maintained higher IAA and SA compared with 'Penncross'. The results suggest that 'Mariner' was able to mitigate salt stress by better ion regulation and differential regulation of hormones compared with 'Penncross'. 'Mariner' leaves and roots showed significantly lower dead cells compared with 'Penncross' under salt stress. The results suggest that staining for cell viability could be a useful technique for studying turfgrass stress or other cellular responses."
Language:English
References:46
Note:Pictures, b/w
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Krishnan, S., and E. B. Merewitz. 2015. Phytohormone responses and cell viability during salinity stress in two creeping bentgrass cultivars differing in salt tolerance. J. Am. Soc. Hortic. Sci. 140(4):p. 346-355.
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DOI: 10.21273/JASHS.140.4.346
Web URL(s):
https://journals.ashs.org/jashs/view/journals/jashs/140/4/article-p346.xml
    Last checked: 04/30/2020
https://journals.ashs.org/jashs/downloadpdf/journals/jashs/140/4/article-p346.xml
    Last checked: 04/30/2020
    Requires: PDF Reader
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