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Growth responses of four warm season turfgrasses to long-term salt stress

CHEN Jing-bo1,YAN Jun1,2,ZHANG Ting-ting1,2,LIU Jian-xiu1,GUO Hai-lin1 (1.Institute of Botany,Jiangsu Province & Chinese Academy of Sciences,Nanjing 210014,China;2.College of Horticulture,Nanjing Agricultural University,Nanjing 210095,China)  
The need for saline-tolerant turfgrasses is increasing because of the turfgrass establishment on highly saline soil in arid and seashore regions or the increased utilization of saline water for greenland irrigation.The salinity tolerance and the growth responses of four new selections of warm season turfgrasses(Zoysia matrella) 'Z123',Z.japonica 'Z080',Cynodon dactylon 'C291',and Paspalum vaginatum 'P006') to long-term salt stress were evaluated.Based on green leaf coverage and total dry weight the salinity tolerance of these turfgrasses decreased in the order: 'Z123''P006''C291''Z080'.Leaf weight,dry shoot weight and shoot length of 'Z123' and 'Z080' were significantly decreased after long-term salt stress,while those of 'P006' and 'C291' were not affected until salinities were higher than 10-20 g/L.'Z123','C291' and 'P006' maintained stable shoot numbers under 20,10 and 5 g/L stress respectively.There was a significant decrease in 'Z080' at 5 g/L stress.Dry rhizome weights and dry root weights of the four turfgrasses were not significantly affected at low salinities(about 5-10 g/L),however,dry root weight was more stable in 'C291' and 'P006' at 5 g/L.The ratios of underground biomass to aboveground biomass of the four turfgrasses all increased with increased salinities,a trend that was quicker in lower salinity tolerance turfgrass.The same organs of the four turfgrasses had different responses to salt stress and different mechanisms for salinity tolerance.
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