Soil salinity is one of the major environmental factors, influencing agricultural productivity of crops. As a non-edible and ideal oilseed crop, castor (Ricinus communis L.) has great industrial value in biofuel, but molecular mechanisms of salt stress regulation are still unknown. In this study, the differentially expressed genes (DEGs) for differential salt tolerance in two castor cultivar (wild castor : Y, cultivated castor ‘Tongbi 5’: Z) were identified. 12 libraries were sampled for Illumina high-throughput sequencing to consider 132,426 nonredundant unigenes and 31,221 gene loci. Multiple phytohormones and transcription factors (TFs) were correlated with salt-tolerance and differently enriched in these two genotypes. The type 2C protein phosphatases (PP2C) homologs were all upregulated under salt stress. Importantly, IAA (1), DELLA (1) and Jasmonate zim domain (JAZ) (1) were also identified and found to be differentially expressed. Based on the co-expressed module by regulatory networks and heatmap analysis, ERF/AP2, WRKY and bHLH families were prominently participate in high salt stress response of wild and cultivated castor. Finally, these results highlight that the hub DEGs and families were more accumulated in cultivated castor than those in wild castor, providing novel insights into the salinity adaptive mechanisms and genetic improvement in castor.

土壤盐分是影响农作物生产力的主要环境因素之一。作为不可食用的理想油料作物，蓖麻（Ricinus communityL.) 在生物燃料方面具有巨大的工业价值，但盐胁迫调节的分子机制尚不清楚。在这项研究中，鉴定了两个蓖麻栽培品种（野生蓖麻：Y，栽培蓖麻'桐碧5'：Z）中差异耐盐性的差异表达基因（DEGs）。对 12 个文库进行了 Illumina 高通量测序，以考虑 132,426 个非冗余 unigenes 和 31,221 个基因位点。多种植物激素和转录因子 (TF) 与耐盐性相关，并且在这两种基因型中富集程度不同。2C 型蛋白磷酸酶 (PP2C) 同源物在盐胁迫下均上调。重要的是，IAA (1)、DELLA (1) 和 Jasmonate zim 域 ( JAZ) (1) 也被鉴定并发现差异表达。基于调控网络的共表达模块和热图分析，ERF/AP2、WRKY和bHLH家族显着参与了野生和栽培蓖麻的高盐胁迫响应。最后，这些结果强调了在栽培蓖麻中比在野生蓖麻中积累了更多的枢纽 DEG 和家族，为蓖麻的盐度适应机制和遗传改良提供了新的见解。