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Comparative analyses of physiological responses of Cynodon dactylon accessions from Southwest China to sulfur dioxide toxicity.

Li X, Wang L, Li Y, Sun L, Cai S, Huang Z - ScientificWorldJournal (2014)

Bottom Line: To achieve better air quality and landscape, planting appropriate grass species in severe SO2 polluted areas is very critical.Cynodon dactylon, a widely used warm season turfgrass species, has good SO2-tolerant ability.Taken together, our results indicated that SO2 tolerance of C. dactylon might be largely related to soluble sugar, proline and chlorophyll a contents, and SO enzyme activity.

View Article: PubMed Central - PubMed

Affiliation: College of Landscape Architecture, Sichuan Agricultural University, No. 211 Huimin Road, Wenjiang, Sichuan 611130, China.

ABSTRACT
Sulfur dioxide (SO2), a major air pollutant in developing countries, is highly toxic to plants. To achieve better air quality and landscape, planting appropriate grass species in severe SO2 polluted areas is very critical. Cynodon dactylon, a widely used warm season turfgrass species, has good SO2-tolerant ability. In this study, we selected 9 out of 38 C. dactylon accessions from Southwest China as representatives of high, intermediate SO2-tolerant and SO2-sensitive accessions to comparatively analyze their physiological differences in leaves under SO2 untreated and treated conditions. Our results revealed that SO2-tolerant C. dactylon accessions showed higher soluble sugar, proline, and chlorophyll a contents under both SO2 treated and untreated conditions; higher chlorophyll b and carotenoid under SO2 treated condition; lower reactive oxygen species (ROS) level, oxidative damages, and superoxide dismutase (SOD) activities under SO2 treated condition; and higher peroxidase (POD) activities under SO2 untreated condition. Further results indicated that SO2-tolerant C. dactylon accessions had higher sulfur contents under both SO2 treated and untreated conditions, consistent with higher SO activities under both SO2 treated and untreated conditions, and higher SiR activities under SO2 treated condition. Taken together, our results indicated that SO2 tolerance of C. dactylon might be largely related to soluble sugar, proline and chlorophyll a contents, and SO enzyme activity.

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Related in: MedlinePlus

Comparison of ROS levels reflected by H2O2 (a) and MDA (b) contents in leaves from nine selected C. dactylon accessions in response to SO2 stress. Mean values are presented with vertical error bars representing the standard deviations (n = 3). The asterisk symbols indicate significant differences between SO2-sensitive accessions and SO2-tolerant accessions.
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fig5: Comparison of ROS levels reflected by H2O2 (a) and MDA (b) contents in leaves from nine selected C. dactylon accessions in response to SO2 stress. Mean values are presented with vertical error bars representing the standard deviations (n = 3). The asterisk symbols indicate significant differences between SO2-sensitive accessions and SO2-tolerant accessions.

Mentions: As two major indicators for reactive oxygen species (ROS) level and oxidative damage, hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents were tested in this study. As shown in Figure 5, the high SO2-tolerant, intermediate SO2-tolerant, and SO2-sensitive C. dactylon accessions displayed nearly the same levels of H2O2 and MDA in leaves at 0-day time-point without SO2 treatment (Figures 5(a) and 5(b)). After 7-day SO2 fumigation treatment, levels of both H2O2 and MDA increased in leaves from all of the nine C. dactylon accessions. When compared within all of the nine C. dactylon accessions, levels of both H2O2 and MDA in leaves from high SO2-tolerant C. dactylon accessions and intermediate SO2-tolerant C. dactylon accessions were significantly lower than those from SO2-sensitive C. dactylon accessions (Figures 5(a) and 5(b)).


Comparative analyses of physiological responses of Cynodon dactylon accessions from Southwest China to sulfur dioxide toxicity.

Li X, Wang L, Li Y, Sun L, Cai S, Huang Z - ScientificWorldJournal (2014)

Comparison of ROS levels reflected by H2O2 (a) and MDA (b) contents in leaves from nine selected C. dactylon accessions in response to SO2 stress. Mean values are presented with vertical error bars representing the standard deviations (n = 3). The asterisk symbols indicate significant differences between SO2-sensitive accessions and SO2-tolerant accessions.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4109121&req=5

fig5: Comparison of ROS levels reflected by H2O2 (a) and MDA (b) contents in leaves from nine selected C. dactylon accessions in response to SO2 stress. Mean values are presented with vertical error bars representing the standard deviations (n = 3). The asterisk symbols indicate significant differences between SO2-sensitive accessions and SO2-tolerant accessions.
Mentions: As two major indicators for reactive oxygen species (ROS) level and oxidative damage, hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents were tested in this study. As shown in Figure 5, the high SO2-tolerant, intermediate SO2-tolerant, and SO2-sensitive C. dactylon accessions displayed nearly the same levels of H2O2 and MDA in leaves at 0-day time-point without SO2 treatment (Figures 5(a) and 5(b)). After 7-day SO2 fumigation treatment, levels of both H2O2 and MDA increased in leaves from all of the nine C. dactylon accessions. When compared within all of the nine C. dactylon accessions, levels of both H2O2 and MDA in leaves from high SO2-tolerant C. dactylon accessions and intermediate SO2-tolerant C. dactylon accessions were significantly lower than those from SO2-sensitive C. dactylon accessions (Figures 5(a) and 5(b)).

Bottom Line: To achieve better air quality and landscape, planting appropriate grass species in severe SO2 polluted areas is very critical.Cynodon dactylon, a widely used warm season turfgrass species, has good SO2-tolerant ability.Taken together, our results indicated that SO2 tolerance of C. dactylon might be largely related to soluble sugar, proline and chlorophyll a contents, and SO enzyme activity.

View Article: PubMed Central - PubMed

Affiliation: College of Landscape Architecture, Sichuan Agricultural University, No. 211 Huimin Road, Wenjiang, Sichuan 611130, China.

ABSTRACT
Sulfur dioxide (SO2), a major air pollutant in developing countries, is highly toxic to plants. To achieve better air quality and landscape, planting appropriate grass species in severe SO2 polluted areas is very critical. Cynodon dactylon, a widely used warm season turfgrass species, has good SO2-tolerant ability. In this study, we selected 9 out of 38 C. dactylon accessions from Southwest China as representatives of high, intermediate SO2-tolerant and SO2-sensitive accessions to comparatively analyze their physiological differences in leaves under SO2 untreated and treated conditions. Our results revealed that SO2-tolerant C. dactylon accessions showed higher soluble sugar, proline, and chlorophyll a contents under both SO2 treated and untreated conditions; higher chlorophyll b and carotenoid under SO2 treated condition; lower reactive oxygen species (ROS) level, oxidative damages, and superoxide dismutase (SOD) activities under SO2 treated condition; and higher peroxidase (POD) activities under SO2 untreated condition. Further results indicated that SO2-tolerant C. dactylon accessions had higher sulfur contents under both SO2 treated and untreated conditions, consistent with higher SO activities under both SO2 treated and untreated conditions, and higher SiR activities under SO2 treated condition. Taken together, our results indicated that SO2 tolerance of C. dactylon might be largely related to soluble sugar, proline and chlorophyll a contents, and SO enzyme activity.

Show MeSH
Related in: MedlinePlus