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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

Symptoms of C. dactylon accessions in response to SO2. (a) SO2-sensitive representative C. dactylon accession CQ1116, (b) intermediate SO2-tolerant representative C. dactylon accession SC1217, (c) high SO2-tolerant representative C. dactylon accession SC1203, and (d) C. dactylon accession CQ1116 without SO2 treatment as a control.
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fig2: Symptoms of C. dactylon accessions in response to SO2. (a) SO2-sensitive representative C. dactylon accession CQ1116, (b) intermediate SO2-tolerant representative C. dactylon accession SC1217, (c) high SO2-tolerant representative C. dactylon accession SC1203, and (d) C. dactylon accession CQ1116 without SO2 treatment as a control.

Mentions: After 7-day fumigation treatment by SO2, injury symptoms appeared on leaves of all the 38 C. dactylon accessions. The visible symptoms consisted of bifacial, marginal, or interval necrosis and chlorosis on leaves at the full stage of development (Figure 2). The necrotic areas ranged from white to brown in color, and the margins of the necrotic areas are mostly irregular and occasionally dark in color. Injury rate of leaves varied in C. dactylon accessions from 38.3% in accession YN1205 to 13.3% in accession SC1203 (Table 2). It seemed that accessions originated from city park and hillside had higher SO2 tolerance than other habitat origins (Tables 1 and 2). To further study the physiological response of C. dactylon to SO2, we selected three accessions of SC1203, SC1209, and GZ1110 as high SO2-tolerant representatives, three accessions of SC1217, YN1110, and XZ1206 as intermediate SO2-tolerant representatives, and three accessions of YN1205, CQ1116, and SC1208 as SO2-sensitive representatives based on the injury rate of leaves and the geographic distribution (Tables 1 and 2).


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)

Symptoms of C. dactylon accessions in response to SO2. (a) SO2-sensitive representative C. dactylon accession CQ1116, (b) intermediate SO2-tolerant representative C. dactylon accession SC1217, (c) high SO2-tolerant representative C. dactylon accession SC1203, and (d) C. dactylon accession CQ1116 without SO2 treatment as a control.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig2: Symptoms of C. dactylon accessions in response to SO2. (a) SO2-sensitive representative C. dactylon accession CQ1116, (b) intermediate SO2-tolerant representative C. dactylon accession SC1217, (c) high SO2-tolerant representative C. dactylon accession SC1203, and (d) C. dactylon accession CQ1116 without SO2 treatment as a control.
Mentions: After 7-day fumigation treatment by SO2, injury symptoms appeared on leaves of all the 38 C. dactylon accessions. The visible symptoms consisted of bifacial, marginal, or interval necrosis and chlorosis on leaves at the full stage of development (Figure 2). The necrotic areas ranged from white to brown in color, and the margins of the necrotic areas are mostly irregular and occasionally dark in color. Injury rate of leaves varied in C. dactylon accessions from 38.3% in accession YN1205 to 13.3% in accession SC1203 (Table 2). It seemed that accessions originated from city park and hillside had higher SO2 tolerance than other habitat origins (Tables 1 and 2). To further study the physiological response of C. dactylon to SO2, we selected three accessions of SC1203, SC1209, and GZ1110 as high SO2-tolerant representatives, three accessions of SC1217, YN1110, and XZ1206 as intermediate SO2-tolerant representatives, and three accessions of YN1205, CQ1116, and SC1208 as SO2-sensitive representatives based on the injury rate of leaves and the geographic distribution (Tables 1 and 2).

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