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. 2020 Mar 7;1(3):100040. doi: 10.1016/j.xplc.2020.100040

Figure 1.

Figure 1

Controversial View on ABI4 Involvement in Plastid to Nucleus Retrograde Signaling.

Recent evidence reported by Kacprzak et al. (2019) shows that ABI4 is not involved in retrograde signaling via GUN1 as previously understood. Because the expression of ABI4 increases under treatment with chloroplast inhibitors, we postulate the existence of an unknown signaling factor beyond ABI4 that regulates expression of retrograde genes independently of GUN1; the unidentified factor is indicated by a dashed line.