PDF(Pubmed)
Abstract：
Algal blooms on the Southern California coast are typically dominated by diatom and dinoflagellate taxa, and are governed by their physiological responses to environmental cues; however, we lack a predictive understanding of the environmental controls underlying the establishment and persistence of these distinct bloom events. In this study, we examined gene expression among the numerically dominant diatom and dinoflagellate taxa during spring upwelling bloom events to compare the physiological underpinnings of diatom vs. dinoflagellate bloom dynamics. Diatoms, which bloomed following upwelling events, expressed genes related to dissolved inorganic nitrogen utilization, and genes related to the catabolism of chitin that may have prolonged their bloom duration following nitrogen depletion. Conversely, dinoflagellates bloomed under depleted inorganic nitrogen conditions, exhibited less variation in transcriptional activity, and expressed few genes associated with dissolved inorganic nutrients during their bloom. Dinoflagellate profiles exhibited evidence of proteolysis and heterotrophy that may have enabled them to bloom to high abundances under depleted inorganic nutrients. Taken together, diatom and dinoflagellate transcriptional profiles illustrated guild-specific physiologies that are tuned to respond to and thrive under distinct environmental \"windows of opportunity.\"
摘要：
南加州海岸的藻类通常以硅藻和鞭毛藻类群为主，并受其对环境线索的生理反应支配；然而，我们对这些不同的开花事件的建立和持续存在所依据的环境控制缺乏预测性理解。在这项研究中,我们检查了春季上升开花事件期间数字优势硅藻和鞭毛藻分类群的基因表达，以比较硅藻与硅藻的生理基础。鞭毛藻开花动力学。硅藻,在上升流事件之后开花，与溶解无机氮利用相关的表达基因，以及与几丁质分解代谢相关的基因，这些基因可能会在氮耗尽后延长其开花持续时间。相反，鞭毛藻在贫化的无机氮条件下开花，在转录活性方面表现出更小的变化，并且在开花期间表达与溶解的无机营养素相关的基因很少。鞭毛藻谱表现出蛋白水解和异源性的证据，这可能使它们在贫乏的无机营养素下高丰度开花。一起来看,硅藻和鞭毛藻转录谱说明了行会特有的生理，这些生理被调整为在不同的环境“机会之窗”下做出反应并茁壮成长。\"
