Effects of Simulated Seawater Stress on Wheat Germination
In order to clarify the effects of saline-alkali(simulated seawater)stress on germination related traits of different wheat varieties,four wheat varieties were used as materials,simulated seawater solutions with 0.0(CK),0.2,0.4,0.6,0.8 and 1.0 times standard salinity were used for stress,and the ideal screening concentration of simulated seawater stress at the germination stage was determined by analyzing the differences in salinity tolerance during germination of four wheat varieties.The results showed that Jinnong 7 and Zhongmai 998 showed much less inhibition in the relative germination potential and relative germination rate compared to Tainong 18 and Jimai 229 under saline-alkali stress,and the inhibition of the four varieties was more serious with the increase of saline-alkali concentration.The relative shoot length,relative maximum root length and relative shoot fresh weight of the four wheat varieties decreased significantly under stress compared to CK,and the inhibition was more serious with the increase of saline-alkali concentration,among which Zhongmai 998 was the least inhibited,and Jimai 229 was the most inhibited.When the concentration was increased to 0.8 times,all four wheat varieties could not germinate.The effects of saline-alkali stress on relative root fresh weight of four varieties were significantly different,and Jinnong 7 was the least affected.Compared with CK,the relative root-shoot ratio of Jinnong 7 and Jimai 229 increased significantly under saline-alkali stress,and under 0.4 times concentration,Jinnong 7(250.63)was higher than those of other varieties.Comprehensive analysis showed that Jinnong 7 and Zhongmai 998 were saline-alkali tolerant varieties,Tainong 18 was intermediate variety,and Jimai 229 was saline-alkali sensitive varieties,the 0.4 times concentration was the suitable concentration for screening wheat saline-alkali tolerance during germination stage.The correlations between relative root-shoot ratio and relative germination potential,relative shoot length,relative maximum root length,and relative shoot fresh weight were not significant,but there were significant or extremely significant correlations among other indexes of seven saline-alkali related characteristics at wheat germination stage.
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