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Marine macroalgae can absorb carbon and play an important role in carbon sequestration. As an important economic macroalga, Gracilariopsis lemaneiformis has the potential to significantly affect carbon absorption and storage in wave-sheltered intertidal reef systems. However, detailed knowledge on seasonal biomass changes and carbon storage of G. lemaneiformis is lacking, especially in many small and scattered ecosystems. Considering the influence of human activities on wild distribution of G. lemaneiformis, the understanding of seasonal dynamics of an economically important species in nature is necessary. In this study, we first investigated seasonal variations in biomass, coverage area, and carbon storage during low tide from August 2011 to July 2012 in Zhanshan Bay, Qingdao, China. Furthermore, we estimated the carbon storage potential of wild G. lemaneiformis using light use efficiency(LUE). The results show that the standing biomass and coverage area changed significantly with season. However, seasonal variations in carbon content and water content were not obvious, with an average content of 35.1% and 83.64%, respectively. Moreover, carbon storage in individual months varied between 0.67 and 47.03 g C/m 2, and the value of carbon storage was the highest in August and June and the lowest in February. In Zhanshan Bay, LUE of G. lemaneiformis was only 0.23%. If it is increased to the theoretical maximum(5%–6%), the carbon storage will have an increase of at least 21 times compared with the current, which suggested that carbon storage of wild G. lemaneiformis had a high enhancement potential. The study will help to assess a potential role of G. lemaneiformis in reducing atmospheric CO2. 相似文献
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龙须菜是一种重要的产琼胶海洋红藻,富含多种活性成分。从1950年代即开始栽培,目前龙须菜/江蓠在中国大型栽培海藻中产量占第二位,2018年产量超过30万t干品,栽培面积达到90 km~2。目前通过全国水产原种和良种审定委员会审定的栽培龙须菜品种有龙须菜"981"、"2007"和"鲁龙1号"三个。龙须菜栽培不仅具有较大的经济效益,也具有较好生态价值。本文介绍了龙须菜人工栽培的技术进步历史、产业分布与发展、对生态环境保护的作用、新品种特性与应用,梳理了龙须菜琼胶合成途径研究和诱变育种技术进展,并对龙须菜栽培产业面临的挑战与未来发展进行了展望。 相似文献
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龙须菜是一种重要的产琼胶海藻,对其繁殖发育的研究将有助于了解龙须菜的生长,有助于育种。本研究对龙须菜不同育性品系(981和鲁龙1号)在不同发育阶段的表达谱数据,采用加权基因共表达网络分析(WGCNA)方法构建基因共表达网络,共获得32个模块。其中,模块最大基因数量为2 577个,最小基因数为66个。经过筛选发现与品系相关的模块(以0.7为阈值)共5个,涉及基因共2 301个,对模块基因进行GO功能富集分析,结果表明主要富集以下功能上:信号转导、转运、细胞分化、翻译、细胞稳态、生物合成过程等。981品系与鲁龙1号品系的富集结果对比表明981品系在孢子放散过程中生物活性不高,生物合成水平较低,内环境稳态较差。经过KEGG富集,筛选到21个与981品系II期四分孢子形成相关的备选基因,主要富集到DNA复制和染色体形态变化等与细胞周期相关的功能上,表明981品系在孢子形成时期的细胞分裂可能出现异常。本文结果为进一步深入揭示龙须菜四分孢子体发育分子调控机制提供思路和导向。 相似文献
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以12个野生型龙须菜个体为材料,选择7个SSR位点,分别使用PAGE电泳银染检测和毛细管电泳荧光检测每个位点的多态性信息,并对这两种方法的检测结果进行了比较。PAGE与毛细管电泳分型结果相一致的4个位点包括全部的五碱基和六碱基重复:H88、S96、H97和H98。而分型结果不一致的3个位点则均为三碱基重复:H30、S25和S28。经测序检验,PAGE结果均准确,而毛细管电泳分型结果出现误差。在样本量少,SSR位点的变异小时,使用PAGE检测SSR位点更为准确。 相似文献
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