Статья

Integration of Auxin and Salt Signals by the NAC Transcription Factor NTM2 during Seed Germination in Arabidopsis

Jungmin ParkDepartment of Chemistry (J.P., Y.-S.K., J.-H.J., C.-M.P.) and Plant Genomics and Breeding Institute (C.-M.P.), Seoul National University, Seoul, Korea 151–742; Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, D–07745 Jena, Germany (S.-G.K.); Department of Biology, Mokpo National University, Jeonnam, Korea 534–729 (J.-C.W.)Youn‐Sung KimDepartment of Chemistry (J.P., Y.-S.K., J.-H.J., C.-M.P.) and Plant Genomics and Breeding Institute (C.-M.P.), Seoul National University, Seoul, Korea 151–742; Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, D–07745 Jena, Germany (S.-G.K.); Department of Biology, Mokpo National University, Jeonnam, Korea 534–729 (J.-C.W.)Sang‐Gyu KimDepartment of Chemistry (J.P., Y.-S.K., J.-H.J., C.-M.P.) and Plant Genomics and Breeding Institute (C.-M.P.), Seoul National University, Seoul, Korea 151–742; Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, D–07745 Jena, Germany (S.-G.K.); Department of Biology, Mokpo National University, Jeonnam, Korea 534–729 (J.-C.W.)Jaehoon JungDepartment of Chemistry (J.P., Y.-S.K., J.-H.J., C.-M.P.) and Plant Genomics and Breeding Institute (C.-M.P.), Seoul National University, Seoul, Korea 151–742; Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, D–07745 Jena, Germany (S.-G.K.); Department of Biology, Mokpo National University, Jeonnam, Korea 534–729 (J.-C.W.)Je‐Chang WooDepartment of Chemistry (J.P., Y.-S.K., J.-H.J., C.-M.P.) and Plant Genomics and Breeding Institute (C.-M.P.), Seoul National University, Seoul, Korea 151–742; Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, D–07745 Jena, Germany (S.-G.K.); Department of Biology, Mokpo National University, Jeonnam, Korea 534–729 (J.-C.W.)Chung‐Mo ParkDepartment of Chemistry (J.P., Y.-S.K., J.-H.J., C.-M.P.) and Plant Genomics and Breeding Institute (C.-M.P.), Seoul National University, Seoul, Korea 151–742; Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, D–07745 Jena, Germany (S.-G.K.); Department of Biology, Mokpo National University, Jeonnam, Korea 534–729 (J.-C.W.)

2011en

ABI

Аннотация

Seed germination is regulated through elaborately interacting signaling networks that integrate diverse environmental cues into hormonal signaling pathways. Roles of gibberellic acid and abscisic acid in germination have been studied extensively using Arabidopsis (Arabidopsis thaliana) mutants having alterations in seed germination. Auxin has also been implicated in seed germination. However, how auxin influences germination is largely unknown. Here, we demonstrate that auxin is linked via the IAA30 gene with a salt signaling cascade mediated by the NAM-ATAF1/2-CUC2 transcription factor NTM2/Arabidopsis NAC domain-containing protein 69 (for NAC with Transmembrane Motif1) during seed germination. Germination of the NTM2-deficient ntm2-1 mutant seeds exhibited enhanced resistance to high salinity. However, the salt resistance disappeared in the ntm2-1 mutant overexpressing the IAA30 gene, which was induced by salt in a NTM2-dependent manner. Auxin exhibited no discernible effects on germination under normal growth conditions. Under high salinity, however, whereas exogenous application of auxin further suppressed the germination of control seeds, the auxin effects were reduced in the ntm2-1 mutant. Consistent with the inhibitory effects of auxin on germination, germination of YUCCA 3-overexpressing plants containing elevated levels of active auxin was more severely influenced by salt. These observations indicate that auxin delays seed germination under high salinity through cross talk with the NTM2-mediated salt signaling in Arabidopsis.

Перевод пока недоступен

Идентификаторы

DOI: 10.1104/pp.111.177071

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar