Kramer Eric M, Ackelsberg Ethan M
Bard College at Simon's Rock Great Barrington, MA, USA.
Front Plant Sci. 2015 Mar 17;6:150. doi: 10.3389/fpls.2015.00150. eCollection 2015.
Studies of auxin metabolism rarely express their results as a metabolic rate, although the data obtained would often permit such a calculation to be made. We analyze data from 31 previously published papers to quantify the rates of auxin biosynthesis, conjugation, conjugate hydrolysis, and catabolism in seed plants. Most metabolic pathways have rates in the range 10 nM/h-1 μM/h, with the exception of auxin conjugation, which has rates as high as ~100 μM/h. The high rates of conjugation suggest that auxin metabolic sinks may be very small, perhaps as small as a single cell. By contrast, the relatively low rate of auxin biosynthesis requires plants to conserve and recycle auxin during long-distance transport. The consequences for plant development are discussed.
生长素代谢的研究很少将其结果表示为代谢率，尽管所获得的数据通常允许进行这样的计算。我们分析了31篇先前发表的论文中的数据，以量化种子植物中生长素生物合成、共轭、共轭水解和分解代谢的速率。大多数代谢途径的速率在10 nM/h至1 μM/h范围内，但生长素共轭除外，其速率高达约100 μM/h。高共轭率表明生长素代谢库可能非常小，也许小到单个细胞。相比之下，生长素生物合成的相对低速率要求植物在长距离运输过程中保存和循环利用生长素。文中讨论了其对植物发育的影响。
