State Key Laboratory of Protein and Plant Gene Research, College of Life Sciences, Peking University, Beijing, China.
Plant Signal Behav. 2011 Dec;6(12):2042-3. doi: 10.4161/psb.6.12.18161.
Triacylglycerol (TAG) is the major storage component accumulated in seed. However the regulatory mechanism of TAG synthesis and accumulation in non-seed tissues remains unknown. Recently, we found that nitrogen (N) deficiency (0.1mM N) caused an inducement of TAG biosynthesis in Arabidopsis seedlings. ABSCISIC ACID INSENSITIVE 4 (ABI4) was essential for the activation of Acyl-CoA:diacylglycerol acyltransferase1(DGAT1) expression during N deficiency in Arabidopsis seedlings. In this addendum, we further discussed the approaches to provide a net increase in total oil production in higher plants by using the low N platform. First, the N-deficient seedlings can be used to determine the key factors that regulate the ectopic expression of key genes in TAG metabolism. Second, the research on the relationship between TAG homeostasis and cell division will be helpful to find the key factors that specifically regulate TAG accumulation under the nutrient-limited condition.
甘油三酯（TAG）是种子中积累的主要储存成分。然而，非种子组织中 TAG 合成和积累的调节机制尚不清楚。最近，我们发现氮（N）缺乏（0.1mM N）会引起拟南芥幼苗中 TAG 生物合成的诱导。在氮缺乏的情况下，ABA 不敏感 4（ABI4）对于酰基辅酶 A：二酰基甘油酰基转移酶 1（DGAT1）表达的激活是必需的。在本增刊中，我们进一步讨论了利用低氮平台增加高等植物总油脂产量的方法。首先，可以利用缺氮幼苗来确定调节 TAG 代谢中关键基因异位表达的关键因素。其次，对 TAG 动态平衡与细胞分裂关系的研究将有助于找到在营养有限条件下专门调节 TAG 积累的关键因素。
