盐胁迫对不同种质小黑麦幼苗水分利用效率和渗透调节的影响OA北大核心CSTPCD

In this study,we compared water use efficiency and the osmotic adjustment system among seedlings of 10 different triticale strains(SD,X-520,X-516,J-46,JIN,HN,T-11,T-9,T-5 and XJ)under salt stress.The salt-stressed group was grown in soil irrigated with salt water to reach a total salt content of 0.6%NaCl,and the control group was grown in soil with normal irrigation.The effects of salt stress on the growth,water use characteristics,and contents of osmotic adjustment substances in triticale were determined,and the different triticale strains were ranked on the basis of their salt tolerance.These analyses provided a theoretical basis for the evaluation of salt-tolerant triticale varieties in Ningxia.It was found that salt stress inhibited the normal growth of triticale,and promoted its water use efficiency and the accumulation and transfer of osmotic adjustment substances.Under salt stress,the highest value for plant height was in X-520,followed by X-516,and the highest values for tiller number and aboveground biomass were in SD.The stable carbon isotope(δ13C)contents were more in SD,X-520,and X-516(-27.33,-27.40,and-27.39,respectively)than in the other triticale strains.The highest contents of proline,soluble protein,and starch were in SD.Correlation analyses showed that δ13C was significantly positively correlated with relative water content and the contents of organic osmotic adjustment substances,root sodium ions,and leaf potassium ions.The strains were ranked from most to least salt tolerant,as follows:SD>X-520>X-516>J-46>JIN>HN>T-11>T-9>T-5>XJ.Therefore,SD,X-516,and X-520 were identified as potential breeding materials to generate new triticale strains suitable for cultivation in saline-alkali land in Ningxia.