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Background  The  res  ( re stored cell structure by  s alinity) mutant, recently identified as the first tomato mutant accumulating jasmonate in roots under non-stressful conditions, exhibits a remarkable growth inhibition and morphological alterations in roots and leaves, which are suppressed when the mutant plants are exposed to salinity. In order to understand the molecular basis of the phenotype recovery induced by salt stress in the  res  mutant, we carried out a comparative transcriptomic analysis in roots and leaves of wild-type and  res  plants in absence of stress (control) and when the phenotypic recovery of  res  mutant began to be observed upon salt stress (5 days of 200 mM NaCl).    Results  The number of differentially expressed genes was three times greater in roots than in leaves of  res  vs WT plants grown in control, and included the down-regulation of growth-promoting genes and the up-regulation of genes involved in Ca 2+  signalling, transcription factors and others related to stress responses. However, these expression differences were attenuated under salt stress, coinciding with the phenotypic normalisation of the mutant. Contrarily to the attenuated response observed in roots, an enhanced response was found in leaves under salt stress. This included drastic expression changes in several circadian clock genes, such as  GIGANTEA1 , which was down-regulated in  res  vs WT plants. Moreover, the higher photosynthetic efficiency of  res  leaves under salt stress was accompanied by specific salt-upregulation of the genes  RUBISCO ACTIVASE1  and  ALTERNATIVE OXIDASE1A . Very few genes were found to be differentially expressed in both tissues (root and leaf) and conditions (control and salt), but this group included  SlWRKY39  and  SlMYB14  transcription factors, as well as genes related to protein homeostasis, especially protease inhibitors such as  METALLOCARBOXYPEPTIDASE INHIBITOR , which also seem to play a role in the phenotype recovery and salt tolerance of  res  mutant.    Conclusions  In summary, in this study we have identified genes which seem to have a prominent role in salt tolerance. Moreover, we think this work could contribute to future breeding of tomato crops with increased stress tolerance.    Electronic supplementary material  The online version of this article (10.1186/s12870-018-1436-9) contains supplementary material, which is available to authorized users.

bmc plant biology

Identification of key genes involved in the phenotypic alterations of res (restored cell structure by salinity) tomato mutant and its recovery induced by salt stress through transcriptomic analysis