Study And Evaluation On Eco-adaptability Of Elymus L.Germplasm Resources

This paper researched twelve Elymus L. germplasm resources. Which had been grown inalpine region of Gansu Agricultural University experimental station were analyzed to evaluatetheir nutrion value and productive force from the development characteristics, productivity,resistance, and photosynthetic characteristics at Tianzhu town. The results were as follows:1. Eight Elymus materials could overwinter safely and the different materials had significantdifferent growth date under the same environmental conditions. The growth dynamics of plantheight increased quickly from turning date to heading date.The leaf and stem ratio of mostmaterials belonged to the range of1.0-1.5, and the material E07had the biggest leaf and stemratio.While the others had higher yield and seed yield besides the materials E04, and the yieldcharacterizes were different significantly.2. The content of water soluble carbohydrate (WSC), starch and crude protein (CP) ofaboveground and belowground (eight Elymus accessions) were analyzed in heading date,flowering date and mature date. The results indicated that the content of water solublecarbohydrate (WSC) and starch of aboveground and belowground exhibited a single-peakpattern, the crude protein (CP) of aboveground declined overall, the crude protein (CP) ofbelowground rised overall as the increase of the growth date. At the different period, thedifferent materials were significantly different.3. The eight Elymus materials of transpiration rates and photosynthetic rates presented atwin-peaked pattern in the flowering date. The phenomena of “noon break” were obvious at14:30. The photosynthetic rates of different materials were affected by the differentphotosynthetic factors. GH2O was the main factor in the characteristics of photosynthesis of thematerials E04, E05, E07.4. The seedling characteristics of three wild Elymus nutans species which from differentaltitudes were treated under drought stress. And then, their leaf relative water content, prolinecontent, MDA, chlorophyll content and the content of sugar were investigated. The resultsshowed that with the days of drought stress increased, leaf relative water content andchlorophyll content were significantly decreased(P<0.05), proline content, MDA, chlorophyllcontent and the content of sugar were significantly decreased(P<0.05). Correlation analysisshowed that there were highly significant correlations among indicators. The drought resistanceof3plants were comprehensively evaluated with subordinate function.Their drought resistanceorder was E01<E02<E03. 5. The germination rate, germination potential and germination index of Elymus nutans E01were inhibited with the increase of salt concentration on the different temperature. The highersalt concentration led to the more obvious inhibition. The optimal temperature for seedgermination was15/25℃. The germination rate increased firstly and then decreased. When theconcentration of NaCl was0.6%, the germination rate reached the maximum. The results ofrecovery experimensl showed that E01still had a germination rate when salt stress wasremoved under low temperature conditions. The total seeds germinations were higher in salt(0.6%) interaction with the lower alternating temperature treatments than the control. Under saltstress,15/25℃was the optmial temperature for shoot growth and root elongation, and wasinhibited when the growing temperature was higher than this range.