LncRNA regulates tomato fruit cracking by coordinating gene expression in hormone-redox-cell wall network
Abstract Background Fruit cracking, occurs easily under unsuitable environmental conditions, is one of the main disorders in fruit production. It is widely accepted that plant have developed a defense mechanisms or regulatory networks in response to abiotic stress. This involves perceiving, integrating and responding to stress signals by modulating the expression of related genes. Fruit cracking is also a kind of physiological disease caused by abiotic stress. Previously reported a single or sevel genes may regulate fruit cracking. However, almost none of these efforts have involved cracking regulatory network. Results Here, 0, 8 and 30 h irrigation treatments resulted in differential expression of 1028 mRNAs and 87 lncRNAs in ‘LA1698’ (cracking resistant, CR) at 8 h_vs_0 h, 468 mRNAs and 15 lncRNAs at CR_30 h_vs_CR_0 h, 321 mRNAs and 19 lncRNAs at CR_30 h_vs_CR_8 h; 531 mRNAs and 75 lncRNAs in ‘LA2683’ (cracking susceptible, CS) at 8 h_vs_0 h, 420 mRNAs and 24 lncRNAs at CS_30 h_vs_CS_0 h, 270 mRNAs and 20 lncRNAs at CS_30 h_vs_CS_8 h; 339 mRNAs and 64 lncRNAs in the two contrasting tomato genotypes at 0 h, 338 mRNAs and 94 lncRNAs at 8 h, and 369 mRNAs and 77 lncRNAs at 30 h. The GO pathway of the differentially expressed mRNAs are mainly enriched in ‘hormone metabolic process’, ‘cell wall organization’, ‘oxidoreductase activity’ and ‘catalytic activity’. In addition, lncRNAs regulated the expression of their neighboring genes and genes related to tomato cracking were selected to construct a lncRNA-mRNA network that influence tomato cracking. Conclutions This study provides insight into the responsive network for water-induced cracking in tomato fruit. specifically lncRNAs regulated hormone-redox-cell wall network, including plant hormone (including auxin, ethylene) and ROS (H 2 O 2 ) signal transduction and many cell wall related mRNAs ( EXP, PG, XTH ), as well as some lncRNAs (XLOC_010878 and XLOC_016662, ect) .