Tominaga-Wada R, Masakane A, Wada T
a Graduate School of Biosphere Sciences , Hiroshima University , Higashi-Hiroshima , Japan.
Plant Signal Behav. 2018;13(6):e1477907. doi: 10.1080/15592324.2018.1477907. Epub 2018 Jun 26.
In Arabidopsis thaliana, the bHLH transcription factor, GLABRA3 (AtGL3), is an important regulator of epidermal cell differentiation and positively controls anthocyanin accumulation. In contrast, we previously showed that Solanum lycopersicum GLABRA3 (SlGL3), the AtGL3 homolog, suppressed anthocyanin accumulation in Arabidopsis. To clarify this functional discrepancy in anthocyanin accumulation, we analyzed the SlGL3 expression pattern in anthocyanin-induced tomato. The SlGL3 expression was significantly reduced in tomato seedlings rich in anthocyanin as a result of inorganic phosphate (Pi) starvation. This was consistent with the previous result obtained in Arabidopsis, wherein the overexpression of SlGL3 was shown to inhibit anthocyanin accumulation. Our study suggests that the function of SlGL3 is different from that of AtGL3, and it might inhibit anthocyanin accumulation in tomato.
在拟南芥中，bHLH转录因子GLABRA3（AtGL3）是表皮细胞分化的重要调节因子，并正向调控花青素积累。相比之下，我们之前发现，AtGL3的同源物番茄（Solanum lycopersicum）GLABRA3（SlGL3）抑制了拟南芥中的花青素积累。为了阐明花青素积累方面的这种功能差异，我们分析了花青素诱导型番茄中SlGL3的表达模式。由于无机磷酸盐（Pi）饥饿，富含花青素的番茄幼苗中SlGL3的表达显著降低。这与之前在拟南芥中获得的结果一致，在拟南芥中，SlGL3的过表达被证明会抑制花青素积累。我们的研究表明，SlGL3的功能与AtGL3不同，它可能会抑制番茄中的花青素积累。
