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Understanding developmental and adaptive cues in pine through metabolite profiling and co-expression network analysis

机译:通过代谢物分析和共表达网络分析了解松树的发育和适应性线索

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摘要

Conifers include long-lived evergreen trees of great economic and ecological importance, including pines and spruces. During their long lives conifers must respond to seasonal environmental changes, adapt to unpredictable environmental stresses, and co-ordinate their adaptive adjustments with internal developmental programmes. To gain insights into these responses, we examined metabolite and transcriptomic profiles of needles from naturally growing 25-year-old maritime pine (Pinus pinaster L. Aiton) trees over a year. The effect of environmental parameters such as temperature and rain on needle development were studied. Our results show that seasonal changes in the metabolite profiles were mainly affected by the needles' age and acclimation for winter, but changes in transcript profiles were mainly dependent on climatic factors. The relative abundance of most transcripts correlated well with temperature, particularly for genes involved in photosynthesis or winter acclimation. Gene network analysis revealed relationships between 14 co-expressed gene modules and development and adaptation to environmental stimuli. Novel Myb transcription factors were identified as candidate regulators during needle development. Our systems-based analysis provides integrated data of the seasonal regulation of maritime pine growth, opening new perspectives for understanding the complex regulatory mechanisms underlying conifers' adaptive responses. Taken together, our results suggest that the environment regulates the transcriptome for fine tuning of the metabolome during development.
机译:针叶树包括具有经济和生态重要性的长寿常绿乔木,包括松树和云杉。针叶树在长寿中必须应对季节性的环境变化,适应不可预测的环境压力,并与内部发展计划协调其适应性调整。为了深入了解这些反应,我们在一年中检查了自然生长的25岁海洋松树(Pinus pinaster L. Aiton)树上的针叶的代谢物和转录组谱。研究了温度和降雨等环境参数对针头发育的影响。我们的结果表明,代谢物特征的季节性变化主要受针头的年龄和冬季适应程度的影响,但转录物特征的变化主要取决于气候因素。大多数转录本的相对丰度与温度密切相关,特别是对于参与光合作用或冬季适应的基因而言。基因网络分析揭示了14个共表达的基因模块与环境刺激的发育和适应之间的关系。新的Myb转录因子被确定为针头发育过程中的候选调节因子。我们基于系统的分析提供了海洋松生长季节性调节的综合数据,为了解针叶树的适应性反应所基于的复杂调节机制开辟了新的视角。两者合计,我们的结果表明环境调节转录组,以便在发育过程中微调代谢组。

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