Evaluation of saline-alkali tolerance of 64 core germplasms of Solanum pimpinellifolium at germination stage
Soil salinization seriously affects crop production.Wild species have evolved a better ability to cope with abiotic stress in the process of adapting to the external environment.In view of the current defi-ciencies in the excavation of saline-alkali tolerant resources,the germination characteristics of wild Sola-num pimpinellifolium core collection under Na2CO3 stress were evaluated in this study.The results showed that Na2CO3 solution had a significant inhibitory effect on the germination of tomato seeds,but the toler-ance of different resources to Na2CO3 stress was significantly different.Under the condition of high Na2CO3 concentration of 60 mmol L-1,the relative germination potential,relative germination rate and rela-tive germination index were comprehensively identified.A total of 14 saline-alkali tolerant materials such as P8,P9,P12,P13,P25,P30,P40,P50,P51,P53,P56,P61,P62 and P63 and 22 saline-alkali sensitive materials were identified.The relative germination rate and relative germination potential of saline-alkali tolerant materials could reach more than 85％.Among them,the relative germination rate and relative ger-mination potential of P51 and P61 reached 100％,which had strong saline-alkali tolerance.Through the analysis of genome-wide data and the reported salt-tolerant SIScaBP8 gene variation from currant toma-toes,it is speculated that the salt-tolerant traits of these resources are controlled by different genes,and some resources contain new salt-tolerant sites,and salt-tolerant and alkali-tolerant may have different reg-ulatory mechanisms.The results of this study provide a new basis for genetic improvement and mecha-nism analysis of saline-alkali tolerance using wild resources.
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