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Publication Type J
Authors Hu, LX; Huang, ZH; Liu, SL; Fu, JM
Author Full Name Hu, Longxing; Huang, Zehui; Liu, Shuilian; Fu, Jinmin
Title Growth Response and Gene Expression in Antioxidant-related Enzymes in Two Bermudagrass Genotypes Differing in Salt Tolerance
Source JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE
Language English
Document Type Article
Keywords Plus DACTYLON L. PERS.; SALINITY TOLERANCE; OXIDATIVE STRESS; DIFFERENTIAL RESPONSE; PERENNIAL RYEGRASS; CULTIVARS; NACL; CHLOROPLASTS; MECHANISMS; WATER
Abstract Plant adaptation to salt stress may be associated with morphological, physiological, and gene expression alterations. The objective of this study was to investigate the effect of salt stress on morphological and antioxidant enzyme changes and its gene expressions in bermudagrass (Cynodon dactylon). Salt-tolerant 'C43' and salt-sensitive 'C198', previously determined in our preliminary study, were subjected to four salinity levels: 0 mM (control), 100 mM (low), 200 mM (moderate), and 400 mM (high) NaCl for 21 days. Salt stress decreased turf quality and canopy height, especially in 'C198'. Salt stress increased root length, root number, root fresh weight, and root/shoot length ratio, to a greater extent in salt-tolerant genotype. Salt stress increased Na+ and decreased K+ content, which resulted in a higher Na+/K+ ratio in bermudagrass, to a great extent in shoot and root of 'C198'. Moderate (200 mM) and high (400 mM) salt concentration increased malondialdehyde and hydrogen peroxide content in old leaves of 'C198'. 'C43' exhibited a greater activity of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and dehydro-ascorbate reductase (DHAR) than 'C198' in old leaves subjected to 200 and 400 mM NaCl. Antioxidant gene expressions were upregulated in new leaves and downregulated in old leaves with increasing salinity levels for both genotypes. Salt-tolerant genotypes exhibited a relatively greater antioxidant gene expression than salt-sensitive ones when exposed to the same level of salt stress. These results suggested that SOD, CAT, APX, and DHAR might be involved in scavenging salt stress-induced reactive oxygen species in bermudagrass at the level of gene expression. Salt tolerance might be attributed to the development and maintenance of a more extensive root system under saline conditions and induced antioxidant gene expressions, leading to more efficient enzyme stimulation and protection in bermudagrass.
Author Address [Hu, Longxing; Huang, Zehui; Liu, Shuilian; Fu, Jinmin] Chinese Acad Sci, Key Lab Plant Germplasm Enhancement & Specialty A, Wuhan Bot Garden, Wuhan 430074, Hubei, Peoples R China
Reprint Address Fu, JM (reprint author), Chinese Acad Sci, Key Lab Plant Germplasm Enhancement & Specialty A, Wuhan Bot Garden, Wuhan 430074, Hubei, Peoples R China.
E-mail Address jinminfu@gmail.com
Funding Agency and Grant Number Young Scientists Fund of the National Natural Science Foundation of China [31101563]; Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences [092A281X02]
Funding Text This work was financially supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 31101563) and the Main Direction Program of Knowledge Innovation of Chinese Academy of Sciences (Grant No. 092A281X02).
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Cited Reference Count 60
Times Cited 14
Total Times Cited Count (WoS, BCI, and CSCD) 18
Publisher AMER SOC HORTICULTURAL SCIENCE
Publisher City ALEXANDRIA
Publisher Address 113 S WEST ST, STE 200, ALEXANDRIA, VA 22314-2851 USA
ISSN 0003-1062
29-Character Source Abbreviation J AM SOC HORTIC SCI
ISO Source Abbreviation J. Am. Soc. Hortic. Sci.
Publication Date MAY
Year Published 2012
Volume 137
Issue 3
Beginning Page 134
Ending Page 143
Page Count 10
Web of Science Category Horticulture
Subject Category Agriculture
Document Delivery Number 969AC
Unique Article Identifier WOS:000306027100002
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