College of Life Sciences and Biotechnology, Korea University, 1, 5-ka Anam-dong, Sungbuk-ku, Seoul 136-713, Republic of Korea.
J Plant Res. 2011 Jan;124(1):193-200. doi: 10.1007/s10265-010-0354-1. Epub 2010 Jun 1.
In an attempt to understand the complex regulatory mechanisms underlying sucrose-induced flavonoid biosynthesis, we examined several Arabidopsis mutants with altered anthocyanin accumulation. We determined that disruption of ethylene signaling results in a dramatic increase in sucrose-induced anthocyanin accumulation. Furthermore, we investigated why the ein2-1 (ethylene insensitive) Arabidopsis mutant accumulates higher levels of anthocyanin in response to sucrose than wild-type Arabidopsis. An increased level of PAP1 transcript in the ein2-1 mutant appears to be the main factor responsible for the increased accumulation of anthocyanin in response to sucrose. Therefore, our results indicate that the ethylene signaling pathway plays a negative role in sucrose-induced anthocyanin accumulation. We believe that the explanation for this observation may be related to the initiation of the senescence program in plants.
为了理解蔗糖诱导类黄酮生物合成背后的复杂调控机制，我们研究了几种花色素苷积累改变的拟南芥突变体。我们发现乙烯信号的破坏导致蔗糖诱导的花色素苷积累显著增加。此外，我们研究了为什么 ein2-1（乙烯不敏感）拟南芥突变体在蔗糖存在下积累比野生型拟南芥更高水平的花色素苷。ein2-1 突变体中 PAP1 转录本水平的增加似乎是蔗糖诱导花色素苷积累增加的主要因素。因此，我们的结果表明，乙烯信号通路在蔗糖诱导的花色素苷积累中起负调控作用。我们认为，这种观察结果的解释可能与植物衰老程序的启动有关。
