Studies On The Reaction Of NaCl Stress And The Mechanism Of Salt Tolerance In Some Turfgrass Species

NaC1 is the major salinity of the Huanghe-Huaihe-Haihe River Plain and Bohai seashore sauna area. In this research pure chemical NaCI was used to stress on turfgrasses in germinating period and seeding period under the different NaC1 concentration from 0% to 1.4%, to analysis its reaction of NaC1 stress and mechanism of salt tolerance, and to evaluate the turfgrasses?syn-capability of salt tolerance and adaptability. The Perennial ryegrass, Tall fescue and Red fescue have the largest seed germination rate under the 8 grades NaCl concentration stress. With the concentration increasing, the seed germination of turfgrass sharply decreased. Most of the turfgrass seeds couldn germinate under the NaC1 stress which concentration was above 0.1%, besides the Zoysia, Alkali grass and Creeping bentgrass got a good germination rate. After treated with 2% NaC1 solution, the LW and RW of 2 month age turfgrass seeding change wasn抰 remarkable compared with the contrast, but the difference is a higher significant among the cultivar. The leave fire rate was very clear in Kentucky bluegrass and Red fescue species. The chlorophyll content of Zoysia and Alkali grass changed a little. The percent of Leaf Fire rate showed that most of the turfgrass species can抰 endure the high salt concentration (>0.1 %NaCI) environment, however, each kind of the grass species generate different mechanism of salt tolerant when the salt concentration was low(<0. 1 %NaCl) environment. Festuca grass can maintain the ion osmotic balance inside and outside the cell through deposited function by intracellular compartmentation of solutes in leave and root cells. Accordingly, Zoysia grass can excrete salinity through special structure to maintain the osmotic balance. The special structures include salt gland, salt hair and bladder cell, etc. Comparatively, it is more effective through special structure excreting than the ion compartimentation mechanism. Many stronger salt tolerance grasses have the kind structure, and most of the grasses appeared in Eragrostidoideas (Zoysia N&conceniration was 5.54mg/g, while the Kentucky bluegrass merit was 2l .9mg/g),.Through the evaIuation of syn-caPability salt tolerance and adaptability andthe analysis on turf grass species by the Analytic Hierarchy Process, it has beenfound that most of the turf grasses accorded with its behaves in the reallyapp1ication. There are only a few species such as red fescue had a high score butthe salt tolerant caPability is weak. The results shows some poor salt tolerantcaPability grasses still have wide exploit potential. The sequence of theexperiment turf grass species by the syn-caPability evaluation of the turf grassessalt tolerance and adaPt-ability is Creeping bentgrasS>Zoysia japonica> Redfescue> Tall fescue >Alkali grass> Kentucky bluegrass.