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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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Comparison of chlorophyll a (a), chlorophyll b (b), total chlorophyll (c), and carotenoid (d) 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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fig4: Comparison of chlorophyll a (a), chlorophyll b (b), total chlorophyll (c), and carotenoid (d) 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: Contents of photosynthetic pigments in leaves from all of the nine C. dactylon accessions decreased under SO2 stress condition but showed different patterns with different pigment (Figure 4). Chlorophyll a contents from two intermediate SO2-tolerant C. dactylon accessions (YN1110 and XZ1206) and from all of the three high SO2-tolerant C. dactylon accessions were significantly higher than those from any of SO2-sensitive C. dactylon accessions in an increasing trend along with the increase of SO2 tolerability at 0-day time-point (Figure 4(a)). Under SO2 stress condition, chlorophyll a contents in leaves from intermediate and high SO2-tolerant C. dactylon accessions reduced significantly less than those from SO2-sensitive C. dactylon accessions. No significant differences of chlorophyll b contents were observed among the high SO2-tolerant, intermediate SO2-tolerant, and SO2-sensitive C. dactylon accessions at 0-day time-point (Figure 4(b)). After 7-day stress treatment by SO2 fumigation, chlorophyll b contents reduced in leaves from all of the nine C. dactylon accessions. The contents of chlorophyll b showed no significant differences between intermediate SO2-tolerant and SO2-sensitive C. dactylon accessions, but significantly less reduction of chlorophyll b content was observed in high SO2-tolerant C. dactylon accessions. As for total chlorophyll content, it showed a similar pattern with chlorophyll a in leaves from all of the nine C. dactylon accessions (Figure 4(c)). Carotenoid contents showed no significant differences among the high SO2-tolerant, intermediate SO2-tolerant, and SO2-sensitive C. dactylon accessions at 0-day time-point but significantly less reduced along with the increase of SO2 tolerability of C. dactylon accessions after 7-day SO2 stress treatment (Figure 4(d)).


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 chlorophyll a (a), chlorophyll b (b), total chlorophyll (c), and carotenoid (d) 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

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fig4: Comparison of chlorophyll a (a), chlorophyll b (b), total chlorophyll (c), and carotenoid (d) 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: Contents of photosynthetic pigments in leaves from all of the nine C. dactylon accessions decreased under SO2 stress condition but showed different patterns with different pigment (Figure 4). Chlorophyll a contents from two intermediate SO2-tolerant C. dactylon accessions (YN1110 and XZ1206) and from all of the three high SO2-tolerant C. dactylon accessions were significantly higher than those from any of SO2-sensitive C. dactylon accessions in an increasing trend along with the increase of SO2 tolerability at 0-day time-point (Figure 4(a)). Under SO2 stress condition, chlorophyll a contents in leaves from intermediate and high SO2-tolerant C. dactylon accessions reduced significantly less than those from SO2-sensitive C. dactylon accessions. No significant differences of chlorophyll b contents were observed among the high SO2-tolerant, intermediate SO2-tolerant, and SO2-sensitive C. dactylon accessions at 0-day time-point (Figure 4(b)). After 7-day stress treatment by SO2 fumigation, chlorophyll b contents reduced in leaves from all of the nine C. dactylon accessions. The contents of chlorophyll b showed no significant differences between intermediate SO2-tolerant and SO2-sensitive C. dactylon accessions, but significantly less reduction of chlorophyll b content was observed in high SO2-tolerant C. dactylon accessions. As for total chlorophyll content, it showed a similar pattern with chlorophyll a in leaves from all of the nine C. dactylon accessions (Figure 4(c)). Carotenoid contents showed no significant differences among the high SO2-tolerant, intermediate SO2-tolerant, and SO2-sensitive C. dactylon accessions at 0-day time-point but significantly less reduced along with the increase of SO2 tolerability of C. dactylon accessions after 7-day SO2 stress treatment (Figure 4(d)).

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