Abstract The composition of secondary cell wall determines the industrially relevant wood properties in tree species. Hence, its biogenesis is one of the most extensively studied developmental processes during wood formation. Presently, systems genetics approach is being applied to understand the biological networks and their interactions operational during secondary development. Genome-scale analyses of secondary cell wall formation were documented and gene regulatory networks were reported in Arabidopsis, poplar, pine, spruce, rice and sugarcane. In the present study, the expression patterns of 2651 transcripts representing different pathways governing secondary development was documented across four genotypes of E. tereticornis. A co-expression network was constructed with 330 nodes and 4512 edges and the degree ranged from 11 to 53. The network documented 75 (22 %) transcription factors with high degree of interaction. Secondary wall associated NAC domain transcription factor (SND2) was identified as the top hub transcript with 53 interactions. The present study revealed that functional homologs regulating secondary cell wall formation are conserved among angiosperms and gymnosperms.

中文翻译：

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Eucalyptus tereticornis次生细胞壁生物发生基因的共表达网络

摘要 次生细胞壁的组成决定了树种的工业相关木材特性。因此，其生物发生是木材形成过程中研究最广泛的发育过程之一。目前，系统遗传学方法正被应用于理解在二次开发过程中运行的生物网络及其相互作用。记录了次生细胞壁形成的基因组规模分析，并报告了拟南芥、杨树、松树、云杉、水稻和甘蔗中的基因调控网络。在本研究中，代表控制二次发育的不同途径的 2651 个转录本的表达模式在 tereticornis 的四种基因型中被记录。构建了一个共表达网络，具有 330 个节点和 4512 条边，度数从 11 到 53。该网络记录了 75 (22%) 个具有高度相互作用的转录因子。次生壁相关 NAC 域转录因子 (SND2) 被确定为具有 53 个相互作用的顶部中心转录本。本研究表明，调节次生细胞壁形成的功能同源物在被子植物和裸子植物中是保守的。