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| DOI: | 10.21273/JASHS.140.6.562 |
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| Web URL(s): | https://journals.ashs.org/jashs/view/journals/jashs/140/6/article-p562.xml
Last checked: 04/30/2020
https://journals.ashs.org/jashs/downloadpdf/journals/jashs/140/6/article-p562.xml
Last checked: 04/30/2020
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Zhang, Xunzhong;
Ervin, Erik H.;
Liu, Yiming;
Hu, Guofu;
Shang, Chao;
Fukao, Takeshi;
Alpuerto, Jasper |
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| Author Affiliation: | Department of Crop and Soil Environmental Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA; Hu: College of Animal Science and Technology, Northeast Agricultural University, Harbin, Heilongjiang, Peoples Republic of China |
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| Title: | Differential responses of antioxidants, abscisic acid, and auxin to deficit irrigation in two perennial ryegrass cultivars contrasting in drought tolerance |
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| Source: | Journal of the American Society for Horticultural Science. Vol. 140, No. 6, November 2015, p. 562-572. |
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| Publishing Information: | Geneva, New York: The American Society for Horticultural Science |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Abscisic acid; Antioxidants; Comparisons; Cultivar evaluation; Cultivar improvement; Deficit irrigation; Drought resistance; Enzymes; IAA; Isoenzymes; Lolium perenne; Plant growth regulators; Water deficit
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| Cultivar Names: | Silver Dollar; Manhattan 5 |
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| Abstract/Contents: | "Water deficit is a major limiting factor for grass culture in many regions with physiological mechanisms of tolerance not yet well understood. Antioxidant isozymes and hormones may play important roles in plant tolerance to water deficit. This study was designed to investigate antioxidant enzymes, isozymes, abscisic acid (ABA), and indole-3-acetic acid (IAA) responses to deficit irrigation in two perennial ryegrass (Lolium perenne L.) cultivars contrasting in drought tolerance. The plants were subjected to well-watered {100% container capacity, 34.4% ± 0.21% volumetric moisture content (VWC), or deficit irrigation [30% evapotranspiration (ET) replacement; 28.6% ± 0.15% to 7.5% ± 0.12% VWC]} conditions for up to 8 days and rewatering for 4 days for recovery in growth chambers. Deficit irrigation increased leaf malondialdehyde (MDA) content in both cultivars, but drought-tolerant Manhattan-5 exhibited lower levels relative to drought-sensitive Silver Dollar. Superoxide dismutase (SOD) activity declined and then increased during water-deficit treatment. 'Manhattan-5' had higher SOD activity and greater abundance of SOD1 isozyme than 'Silver Dollar' under water deficit. Deficit irrigation increased catalase (CAT) and ascorbate peroxidase (APX) activity in 'Manhattan-5', but not in 'Silver Dollar'. 'Manhattan-5' had higher CAT, APX, and peroxidase (POD) activity than 'Silver Dollar' during water limitation. Deficit irrigation increased mRNA accumulation of cytosolic cupper/zinc SOD (Cyt Cu/Zn SOD), whereas gene expression of manganese SOD (Mn SOD) and peroxisome APX (pAPX) were not significantly altered in response to deficit irrigation. No differences in Cyt Cu/Zn SOD, Mn SOD, and pAPX gene expression were found between the two cultivars under deficit irrigation. Water limitation increased leaf ABA and IAA contents in both cultivars, with Silver Dollar having a higher ABA content than Manhattan-5. Change in ABA level may regulate stomatal opening and oxidative stress, which may trigger antioxidant defense responses. These results indicate that accumulation of antioxidant enzymes and ABA are associated with perennial ryegrass drought tolerance. Activity and isozyme assays of key antioxidant enzymes under soil moisture limitation can be a practical screening approach to improve perennial ryegrass drought tolerance and quality." |
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| Language: | English |
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| References: | 49 |
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| Note: | Pictures, color
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Zhang, X., E. H. Ervin, Y. Liu, G. Hu, C. Shang, T. Fukao, et al. 2015. Differential responses of antioxidants, abscisic acid, and auxin to deficit irrigation in two perennial ryegrass cultivars contrasting in drought tolerance. J. Am. Soc. Hortic. Sci. 140(6):p. 562-572. |
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| DOI: 10.21273/JASHS.140.6.562 |
| Web URL(s):
https://journals.ashs.org/jashs/view/journals/jashs/140/6/article-p562.xml
Last checked: 04/30/2020
https://journals.ashs.org/jashs/downloadpdf/journals/jashs/140/6/article-p562.xml
Last checked: 04/30/2020
Requires: PDF Reader |
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MSU catalog number: b2221587a |
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