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Rice ONAC106 inhibits leaf senescence and increases salt tolerance and tiller angle

Cited 62 time in Web of Science Cited 70 time in Scopus
Authors
Sakuraba, Yasuhito; Piao, Weilan; Lim, Jung-Hyun; Han, Su-Hyun; Kim, Ye-Sol; An, Gynheung; Paek, Nam-Chon
Issue Date
2015
Publisher
Oxford University Press
Citation
Plant & Cell Physiology, vol.56 no.12, pp. 2325-2339
Keywords
Leaf senescenceNAC transcription factorONAC106onac106-1DRiceSalt toleranceTiller angle
Abstract
NAM/ATAF1/ATAF2/CUC2 (NAC) is a plant-specific transcription factor (TF) family, and NACs participate in many diverse processes during the plant life cycle. Several
Arabidopsis thaliana NACs have important roles in positively or negatively regulating leaf senescence, but in other plant species, including rice, the senescence-associated NACs (senNACs) remain largely unknown. Here we show that
the rice senNAC TF ONAC106 negatively regulates leaf senescence. Leaves of onac106-1D (insertion of the 35S enhancer in the promoter region of the ONAC106 gene) mutants retained their green color under natural senescence and dark-induced senescence conditions. Genome-wide transcriptome analysis revealed that key senescence-associated genes (SGR, NYC1, OsNAC5, OsNAP, OsEIN3 and OsS3H) were differentially expressed in onac106-1D during dark-induced senescence. In addition to delayed senescence, onac106-1D also showed a salt stress-tolerant phenotype; key genes that down-regulate salt response signaling (OsNAC5, OsDREB2A, OsLEA3 and OsbZIP23) were rapidly up-regulated in onac106-1D under salt stress. Interestingly, onac106-1D also exhibited a wide tiller angle phenotype throughout development, and the tiller angle-related gene LPA1 was downregulated in onac106-1D. Using yeast one-hybrid assays, we found that ONAC106 binds to the promoter regions of SGR, NYC1, OsNAC5 and LPA1. Taking these results together, we propose that ONAC106 functions in leaf senescence, salt
stress tolerance and plant architecture by modulating the expression of its target genes that function in each signaling pathway.
Language
English
URI
https://hdl.handle.net/10371/95435
DOI
https://doi.org/10.1093/pcp/pcv144
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Plant Science (식물생산과학부)Journal Papers (저널논문_식물생산과학부)
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