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Polyamines and antioxidant defense system are associated with cold tolerance in centipedegrass

Frontiers of Agricultural Science and Engineering 2018年第1期5卷 129-138页

作者： Jingjing CHEN Junyang FANG Zhenfei GUO Shaoyun LU College of Life Sciences Guangdong Engineering Research Center for Grassland Science/State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural University Key Laboratory of Tropical Fruit Biology of Ministry of Agriculture/South Subtropical Crops Research Institute Chinese Academy of Tropical Agricultural Science College of Grassland Science Nanjing Agricultural University

Physiological responses to low temperature were analyzed in a chilling-tolerant centipedegrass(Eremochloa ophiuroides) accession, Shao Guan(SG), in comparison to the commercial cultivar, Common. Lower levels of ion leakage and higher chlorophyll(Chl)concentration were observed in SG than in Common during chilling stress. The maximum photochemical efficiency, the actual photosystem Ⅱ(PSII) efficiency,photochemical quenching efficiency, and net photosynthetic rate were decreased during chilling stress in both genotypes, with higher levels of these parameters shown by SG than Common. In addition, higher activities of superoxide dismutase(SOD), catalase(CAT), ascorbateperoxidase(APX) and glutathione reductase(GR), and higher concentrations of ascorbic acid(AsA) and glutathione(GSH) were observed in SG than in ***, higher concentrations of putrescine(Put),spermidine(Spd), and spermine(Spm) were observed in SG than in Common. Correlation analysis indicated that SOD, CAT, APX and GR activities, and As A and GSH concentrations showed high correlation to Put, while APX,GR, and As A concentrations were correlated to *** Put or Spd increased antioxidant enzyme activities and chilling tolerance. The results suggested that polyamine-regulated antioxidants are important for chilling tolerance in centipedegrass and protect plants against chilling induced oxidative damage.

关键词： antioxidants centipedegrass chilling photosynthesis polyamines

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Carbon Sequestration under Warm Season Turfgrasses in Home Lawns

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Journal of Geoscience and Environment Protection 2016年第9期4卷 53-63页

作者： Said A. Hamido E. A. Guertal C. Wesley Wood Southwest Florida Research and Education Center University of Florida Immokalee FL USA Crop Soil and Environmental Sciences Department Auburn University Auburn AL USA West Florida Research and Education Center University of Florida Milton FL USA

Turfgrass cover in the U.S. is expanding because of increasing urbanization and the addition of approximately 675,000 ha of residential property every year. Despite its large-scale presence in the urban ecosystem, the role of turfgrasses in carbon (C) cycling in home lawns in southeastern U.S. soils has not been documented, and studies with warm-season turf grasses are lacking. The objective of this study was to estimate carbon (C) sequestration in soil as affected by turfgrass species, including: bermudagrass (Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt Davy), centipede grass (Erecholmoa ophroides (Munroe) Hack.), and zoysiagrass (Zoysia spp.). The study was initiated in the winter of 2012 and conducted for two years on a loamy sand (fine-loamy, kaolinitic, thermic Typic Kanhapludult) soil. Eighteen lawns were sampled twice per year: six lawns of each grass species, with the harvested grasses separated into stems, above ground biomass (verdure) + thatch, and belowground roots. Soil samples (0 - 5, 5 - 10, and 10 - 20 cm) were also collected. Total C concentration was determined on finely ground-dried samples by combustion. Turfgrass species, season and years of sampling were all significantly (P ≤ 0.05) affected by C sequestration. Zoysiagrass had the highest mean levels of sequestered C, with a value of 5.54 ± 0.21, compared to 2.09 ± 0.11 and 4.23 ± 0.14 Mg·ha-1·yr-1 under bermudagrass and centipedegrass at the end of the study, respectively. This work indicates that turfgrass home lawns may be an important contribution to the global carbon sequestration level.

关键词： Carbon Sequestration Soil Organic Carbon Bermudagrass centipedegrass Zoysiagrass

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