Winter hardiness of 30 germplasm materials of Elymus sibiricus

An experiment was conducted to screen the germplasm materials with high winter hardiness by measuring the leaf electronic conductivity of 30 germplasm materials of Elymus sibiricus seedlings growing at 28 ℃ and 5 ℃ for 12 h in the nursery plate. The results of this study showed 30 germplasm materials of E. sibiricus were divided into very high, high, medium winter hardiness. 25 Germplasm materials of E. sibiricus were very high winter hardiness and took up 83.33% of the all materials, including ES002, ES004, ES006, ES009, ES010, ES012, ES014, ES015, ES016, ES017, ES018, ES019, ES025, ES026, ES028, ES029, ES030, ES031, ES032, ES034, ES036, ES037, ES038, ES039, ES040. Germplasm materials of E. sibiricus with high winter hardiness were ES001, ES005, ES007, and occupying up 10.00%. ES013 and ES033 showed the medium winter hardiness and were 6.67% of the all germplasms. The winter hardiness of 30 germplasm materials of E. sibiricus was significantly different (P0.001) and classified into 17 various combination, and these suggested that E. sibiricus showed the widely ecological plasticity, and developed different winter hardiness due to longtime adaptation for the original habitat.