Marine aquaculture’s carbon footprint
Demand for seafood is projected to rise in the coming decades. While catches from wild fisheries have stagnated, several types of aquaculture production systems have emerged to meet this demand. Marine aquaculture, or mariculture, forms a small part of the aquaculture sector with potential for growth. Climate-friendly farm designs, species selection, low-density operational practices and careful site selection can mitigate potential damage to marine ecosystems and avoid carbon loss. Mariculture’s carbon footprints could be ~40% lower than those of freshwater aquaculture based on fish feed, energy use and the aquatic environment emissions — offering an opportunity for environmentally sustainable seafood production.
PBJ:中国农大揭示植物响应低温的新机制
低温是影响植物生长发育的重要因素。细胞壁在植物响应环境胁迫过程中发挥重要作用。
本研究发现细胞壁的重要组分之一纤维素在低温条件下被累积，这与纤维素合成相关基因MaCESA 表达被诱导有关。 分析显示一个NAC transcriptional factor MaNAC1与拟南芥中参与此生细胞壁合成的转录因子SND3序列相似,过表达 MaNAC1导致细胞壁加厚以及纤维类糖苷水平显著增加。于此同时在拟南芥的snd3突变体中过表达MaNAC1可以挽救拟南芥次生细胞壁缺陷表型。 转录分析显示MaCESA7 and MaCESA6B 是MaNAC1的直接靶基因，启动子区SNBE 是他们被遇到表达的关键。最后，作者证实过表达 MaNAC1可以显著提高植物对冷胁迫的耐受性。
小结：本研究揭示了转录因子MaNAC1通过加厚细胞壁提高植物耐冷的机制。
原文：Banana MaNAC1 activates secondary cell wall cellulose biosynthesis to enhance chilling resistance in fruit
