Funneling of gibberellin signaling by the GRAS transcription regulator scarecrow-like 3 in the Arabidopsis root.
During plant development, because no cell movement takes place, control of the timing and extent of cell division and coordination of the direction and extent of cell expansion are particularly important for growth and development. The plant hormone gibberellins (GAs) play key roles in the control of these developmental processes. However, little is known about the molecular components that integrate the generic GA signaling into a specific cell/tissue to coordinate cell division and cell expansion. Here we report that scarecrow-like 3 (SCL3), a GRAS protein, acts as a positive regulator to integrate and maintain a functional GA pathway by attenuating the DELLA repressors in the root endodermis. The tissue-specific maintenance of GA signaling in the root endodermis plays distinct roles along the longitudinal root axis. While in the elongation/differentiation zone (EDZ), the endodermis-confined GA pathway by SCL3 controls primarily coordination of root cell elongation; in the meristem zone (MZ) SCL3 in conjunction with the short-root/scarecrow (SHR/SCR) pathway controls GA-modulated ground tissue maturation. Our findings highlight the regulatory network of the GRAS transcription regulators (SCL3, DELLAs, and SHR/SCR) in the root endodermis, shedding light on how GA homeostasis is achieved and how the maintenance of GA signaling controls developmental processes in roots.
Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Korea.
Jung-Ok
JO
Heo
Kwang Suk
KS
Chang
In A
IA
Kim
Mi-Hyun
MH
Lee
Shin Ae
SA
Lee
Sang-Kee
SK
Song
Myeong Min
MM
Lee
Jun
J
Lim
D017360:Arabidopsis / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics*; D005875:Gibberellins / Q000378:metabolism*; D018517:Plant Roots / Q000378:metabolism*; D015398:Signal Transduction; D014158:Transcription, Genetic
D029681:Arabidopsis Proteins; D005875:Gibberellins; C100978:SCR protein, Arabidopsis
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