The essential role of jasmonate signaling in Solanum habrochaites rootstock-mediated cold tolerance in tomato grafts  

作　　者：Lihui Wang Bo Wu Guoyu Chen Hui Chen Yuquan Peng Hamza Sohail Shouyu Geng Guangbao Luo Dandi Xu Bo Ouyang Zhilong Bie 

机构地区：[1]Key Laboratory of Horticultural Plant Biology,Ministry of Education,College of Horticulture and Forestry Sciences,Huazhong Agricultural University,Wuhan,430070,P.R.China

出　　处：《Horticulture Research》2023年第1期45-56,共12页园艺研究（英文）

基　　金：This research was supported by the National Key Research and Development Program(2019YFD1001900,2022YFE0100900);the Natural Science Foundation of Hubei Province(2019CFA017).

摘　　要：Tomato(Solanum lycopersicum)is among the most important vegetables across the world,but cold stress usually affects its yield and quality.The wild tomato species Solanum habrochaites is commonly utilized as rootstock for enhancing resistance against abiotic stresses in cultivated tomato,especially cold resistance.However,the underlying molecular mechanism remains unclear.In this research,we confirmed that S.habrochaites rootstock can improve the cold tolerance of cultivated tomato scions,as revealed by growth,physiological,and biochemical indicators.Furthermore,transcriptome profiling indicated significant differences in the scion of homo-and heterografted seedlings,including substantial changes in jasmonic acid(JA)biosynthesis and signaling,which were validated by RT–qPCR analysis.S.habrochaites plants had a high basal level of jasmonate,and cold stress caused a greater amount of active JA-isoleucine in S.habrochaites heterografts.Moreover,exogenous JA enhanced while JA inhibitor decreased the cold tolerance of tomato grafts.The JA biosynthesis-defective mutant spr8 also showed increased sensitivity to cold stress.All of these results demonstrated the significance of JA in the cold tolerance of grafted tomato seedlings with S.habrochaites rootstock,suggesting a future direction for the characterization of the natural variation involved in S.habrochaites rootstock-mediated cold tolerance.

关 键 词：CULTIVATED SOLANUM fir 

分 类 号：S641.2[农业科学—蔬菜学]