| The simulating salinity stress method in green house was adopted, and the relative water content, the relative electrical conductivity rate(REC), the content of free proline（Pro）, K+/Na+, the change rate of relative growth(RWC), the salt-tolerant coefficient, the livability and the days of salinity injure to death of 34 germplasm and materials of 8 species of Elytrigia Desv. collected from 21 different countries were measured and analyzed at seedling stage, and th
e above 8 index values at 0.9% NaCl concentration were analyzed using the Euclidean Farthest Distance Cluster Method. The results showed that 34 germplasm and materials were classified into 3 salt tolerant colonies (classes), namely higher salt tolerant germplasm (HSTG), medium salt tolerant germplasm (MSTG) and sensit
ive salt germplasm (SSG). And different variation trends and rules of the physiological indexes of different salt tolerant Elytrigia Desv. germpalsm were sh
owed, among them, REC, Pro and Na+ showed gradually increase but K+、K+/Na+ and RWC showed gradually decrease, but when NaCl concentration was raised up to 1.2%, REC, Pro and Na+ were increased by 121.83%, 29.25 times and 145.45%; K+, K+/Na+ and RWC were decreased by 26.89%, 74.26% and 16.40% for the HSTG, respectively. However, REC, Pro and Na+ were increased by 199.20%, 75.45 times and 17.86%; K+, K+/Na+ and RWC were decreased by 43.16%, 93.55% and 27.69% for the SSG, respectively. The increase and decrease scales of the MSTG were in the middle. |