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DOI:10.21273/JASHS.135.2.116
Web URL(s):https://journals.ashs.org/jashs/view/journals/jashs/135/2/article-p116.xml
    Last checked: 12/06/2019
    Requires: PDF Reader
Publication Type:
i
Refereed
Author(s):He, Yali; Huang, Bingru
Author Affiliation:He: State Key of Agrobiotechnology, Department of Plant Sciences, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanhai, People's Republic of China; Huang: Department of Plant Science, Cook College, Rutgers University, New Brunswick, NJ
Title:Differential responses to heat stress in activities and isozymes of four antioxidant enzymes for two cultivars of Kentucky bluegrass contrasting in heat tolerance
Section:Environmental stress physiology
Other records with the "Environmental stress physiology" Section
Source:Journal of The American Society for Horticultural Science. Vol. 135, No. 2, March 2010, p. 116-124.
Publishing Information:Alexandria, Va.: American Society for Horticultural Science
# of Pages:9
Keywords:TIC Keywords: Ascorbate peroxidase; Chlorophyll content; Heat resistance; Heat stress; Isoenzymes; Poa pratensis; Superoxide dismutase
Cultivar Names:Eagleton; Brilliant
Abstract/Contents:"Understanding antioxidant mechanisms for heat stress is important for improving heat tolerance in cool-season plant species. The objective of this study was to identify antioxidant enzymes associated with cultivar variations in heat tolerance in kentucky bluegrass (Poa pratensis) by comparing heat responses of activity and isoforms of antioxidant enzymes in two cultivars contrasting in heat tolerance. Plants of heat-tolerant 'Eagleton' and heat-sensitive 'Brilliant' were exposed to 20 °C (control) or 40 °C (heat stress) for 28 days in growth chambers. Chlorophyll (Chl) a content remained unchanged and Chl b content increased in 'Eagleton', while both of them decreased in 'Brilliant', and by 28 days, 'Eagleton' had significantly higher Chl a and b content than 'Brilliant'. The activities of superoxide dismutase (SOD) were significantly higher in 'Eagleton' than in 'Brilliant' by 28 days of heat stress. An isozyme SOD2 was induced early during heat stress in 'Eagleton', while isozyme SOD3 degraded, to a lesser extent in 'Eagleton' than in 'Brilliant'. Catalase (CAT) activity significantly increased in 'Brilliant' but remained constant in 'Eagleton', and 'Brilliant' had a significantly higher CAT activity and isozyme CAT1 than 'Eagleton' during heat stress. Significant increases in ascorbate peroxidase (APX) activities occurred under heat stress, to a greater extent in 'Eagleton', whereas isozymes did not exhibit difference between cultivars. Guaiacol-peroxidase (POD) activity declined during heat stress in both cultivars. The intensity of POD isozymes in 'Brilliant' remained constant, while 'Eagleton' showed a transient increases in POD1 at 7 days of heat stress. Our results indicated that antioxidant defense mechanisms for heat tolerance in kentucky bluegrass could be mainly associated with changes in activity and forms of isozymes of SOD for O2 scavenging and APX activity for H2O2 scavenging under heat stress."
Language:English
References:Unknown
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
He, Y., and B. Huang. 2010. Differential responses to heat stress in activities and isozymes of four antioxidant enzymes for two cultivars of Kentucky bluegrass contrasting in heat tolerance. J. Am. Soc. Hortic. Sci. 135(2):p. 116-124.
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DOI: 10.21273/JASHS.135.2.116
Web URL(s):
https://journals.ashs.org/jashs/view/journals/jashs/135/2/article-p116.xml
    Last checked: 12/06/2019
    Requires: PDF Reader
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