Project description:To provide insights into how SUN regulates shape and whether this is accompanied with shifts in transcript profiles, we identified differentially expressed genes in eight pairwise comparisons of SUN and wild-type fruit tissues and time points. Lines nearly isogenic for SUN in the cultivated background Solanum lycopersicum c.v. SUN1642 were grown in the greenhouse in a completely randomized design. SA4 is like SUN1642 and SA3 is like WT LA1589 at SUN locus. Flowers at anthesis were tagged and self-pollinated on successive days. Anthesis is defined as when the flower opens. Pollination of flowers was staggered so fruit of all developmental stages would be harvested on the same day. Fruits at stage four, seven, and ten days post anthesis (dpa) were harvested and brought back to the laboratory. Septum, seed, and pericarp tissue were isolated and frozen in liquid nitrogen. Four dpa septum tissues is a mixture of septum and seed tissue. Four dpa pericarp is a mixture of pericarp and exocarp tissue due to small size of four dpa fruits. Seven and 10 dpa pericarp dont contain the exocarp (epidermal) tissues. Four replicates were collected. RNA was extracted using Trizol and Stand-specific libraries were prepared from total RNA and sequences of 51 bp were generated on an Illumina HiSeq2000.
Project description:RNA interference (RNAi) is a widely-used approach to generate virus-resistant transgenic crops. However, durability of RNAi-mediated resistance under extreme field conditions and side-effects of stable RNAi expression have not been thoroughly investigated. Here we performed field trials and molecular characterization of two RNAi-transgenic Solanum lycopersicum lines resistant to Tomato yellow leaf curl virus (TYLCV) disease, the major constraint for tomato cultivation in Cuba and worldwide. In order to determine potential impact of the hairpin RNA transgene expression on tomato genome expression and development, differences in the phenotypes and the transcriptome profiles between the transgenic and non-transgenic plants were examined. Transcriptome profiling revealed a common set of up- and down-regulated tomato genes, which correlated with slight developmental abnormalities in both transgenic lines.
