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- W3216171419 abstract "Hevea brasiliensis, a tropical tree species from the Amazon rainforest, is the main world source of natural rubber. Due to the high pressure of fungal diseases in hot humid regions, rubber plantations have been moved to escape areas, which are dryer and present lower temperatures during the winter. We carried out a study with a primary (GT1) and a secondary (RRIM 600) young rubber tree clones, which present different cold tolerance strategies, to analyze gene expression regulation while under 24 hours of cold exposure (10 degrees Celsius). Together with traditional differential expression approaches, a RNA-seq gene co-expression network (GCN) was established with 27,220 genes that were grouped into 205 gene clusters. Through the GCN, we could relate the predominance of rubber tree molecular responses on cold stress to 31 clusters, which were divided in three GCN modules: a down-regulated group with 16 clusters and two up-regulated groups with twelve and three clusters, respectively. The hub genes of the cold-responsive modules were identified and analyzed as well. Considering the three modules and hub genes identified, the general Hevea response to short term cold exposure involves a complex regulation of Jasmonic Acid (JA) stress response and programmed cell death (PCD), up-regulation of Ethylene responsive genes and relaxation on the inhibition of florigen genes. As a result of the GCN strategy applied in this study, we could not only access single DEGs related to Hevea cold responses, but also provide insights into a deeper cascade of associated mechanisms involved in the response to cold stress in young rubber trees. Our results may represent the species genetic stress responses developed during its evolution since the varieties chosen for this work are genotypes selected during the early years of rubber tree domestication. The understanding of H. brasiliensis cold response mechanisms can greatly improve the breeding strategies for this crop that has such a narrow genetic base, is being impacted by climate change and is the only source for large scale rubber production." @default.
- W3216171419 created "2021-12-06" @default.
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- W3216171419 date "2021-11-04" @default.
- W3216171419 modified "2023-10-11" @default.
- W3216171419 title "Novel insights into the cold resistance of Hevea brasiliensis through coexpression networks" @default.
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- W3216171419 doi "https://doi.org/10.1101/2021.11.02.466997" @default.
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